Backend Software Engineer

About the RoleJoin our innovative team at character as a Backend Software Engineer. In this pivotal role, you will develop and sustain scalable, high-performance backend systems that drive our products forward. You will collaborate closely with designers, data scientists, and fellow engineers to create, design, and implement robust backend solutions that meet user demands.Your ResponsibilitiesArchitect, develop, and manage scalable backend services that bolster our applications and infrastructure.Craft secure and efficient APIs to facilitate frontend applications and third-party integrations.Enhance system performance, reliability, and scalability through architectural best practices and engineering expertise.Collaborate with product managers, data analysts, and frontend engineers to deliver backend solutions that align with business goals and user expectations.Guarantee high availability, fault tolerance, and optimal performance of backend systems.Monitor system health, troubleshoot issues, and implement enhancements to improve efficiency and reliability.Adhere to security best practices to safeguard user data and maintain system integrity.Stay informed about industry trends and emerging technologies in backend development and distributed systems.Your Profile5+ years of experience in backend development, creating scalable and dependable applications.Strong proficiency in programming languages such as Python, Java, or Go, with a preference for Python and Go.Familiarity with database technologies, including PostgreSQL, MySQL, or NoSQL solutions.Experience in designing and integrating APIs, particularly REST and GraphQL.Understanding of distributed systems, microservices architecture, and cloud platforms (AWS, GCP, or Azure).Proficiency with containerization and orchestration tools like Docker and Kubernetes.Strong analytical skills with the ability to optimize system performance and reliability.Excellent communication skills and a collaborative mindset.Preferred QualificationsExperience with...

About the RoleJoin our innovative Safety Engineering team at Character.AI as a talented Software Engineer. In this pivotal role, you will be instrumental in designing, developing, and scaling advanced backend systems while applying machine learning techniques to address critical safety and integrity challenges. You will be at the forefront of developing innovative solutions to navigate the complex safety landscape associated with human-AI interactions, utilizing your technical skills to help establish industry best practices in this rapidly evolving domain. This high-impact position will enable you to provide technical leadership, foster innovation, and enhance the trustworthiness of our platform.What You'll DoArchitect & Build: Design, develop, and maintain highly scalable, resilient, and efficient backend systems that support our integrity and safety functionalities.Lead Complex Solutions: Spearhead the technical design and implementation of sophisticated backend solutions aimed at detecting, preventing, and mitigating various integrity risks, including traditional challenges like content classification and spam, as well as emerging threats associated with Generative AI.Apply Machine Learning: Conceptualize, develop, deploy, and refine machine learning models and algorithms to tackle complex integrity issues, including content classification, anomaly detection, risk scoring, and behavior analysis, while ensuring robust safeguards for Generative AI systems.Cross-Functional Collaboration: Work closely with product managers, data scientists, AI researchers, security teams, and operations to define requirements, design innovative solutions, and deliver impactful integrity systems, particularly for Generative AI products.Technical Strategy & Roadmap: Drive the long-term technical vision and roadmap for backend integrity systems and applied ML capabilities, focusing on addressing Generative AI safety concerns in alignment with company objectives.Mentorship & Leadership: Provide technical guidance and mentorship to fellow engineers within the team and across the organization, fostering a culture of engineering excellence.

Zūm is a dynamic and rapidly growing Series E startup, proudly supported by leading industry investors including Sequoia Capital, SoftBank, Spark Capital, and GIC. Our ambitious mission is to revolutionize the traditional school transportation sector. With operations spanning over 15 states in the U.S., and flagship hubs located in San Francisco, Los Angeles, and Seattle, we are now extending our services to the East Coast and Midwest. As a technology-centric organization, we employ state-of-the-art solutions to efficiently manage school district transportation systems, while also launching our own charter platform and innovating proprietary SaaS solutions. In addition, we are leading a national initiative to electrify school transportation fleets, contributing to local utilities by supplying essential energy back to the grid. Our efforts have earned us recognitions such as being named a CNBC 50 Disruptor, a Financial Times 500 Fastest Growing Company, and a Fast Company World Changing Idea.This is a hybrid role based out of our headquarters in Redwood City, CA, requiring in-office attendance at least three days a week (Monday - Thursday). Candidates must be located in the Bay Area.Who You Are:We are seeking to onboard talented Senior Engineers to our backend engineering team. This role offers a unique opportunity to actively contribute to the development of Zūm’s technology platform. If you are a proactive developer who thrives on tackling complex challenges and creating meaningful solutions, this position is tailor-made for you.What You'll Do:In this position, you will take ownership of one or more backend platform verticals. Your responsibilities will include building customer-facing product features and enhancing platform capabilities to deliver substantial business value. You will develop microservices using the latest technologies, including Kubernetes, Kafka, Postgres, and gRPC. You will also play a key role in establishing robust engineering practices by writing high-quality, maintainable, testable, and scalable code while conducting code reviews. Additionally, you will create applications to enhance visibility and traceability across our systems using tools like Datadog, Rollbar, and Segment.What You Bring To Zūm:Qualifications for this role include:• A Bachelor’s degree or higher in Computer Science or a related field• A minimum of 5 years of relevant experience in backend development

Join NimbleRx as a Senior Backend EngineerAt NimbleRx, we are revolutionizing healthtech by simplifying healthcare access and management. Our goal is to create the most beloved pharmacy business worldwide. As a rapidly expanding, technology-centric startup, we prioritize enhancing the experiences of patients and pharmacists alike. Our culture promotes teamwork, transparent communication, and proactive decision-making, empowering us to tackle exciting challenges and achieve remarkable growth.Role Overview: As a Senior Backend Engineer, you will play a crucial role in designing the architecture and customer experience for various web products catering to patients, pharmacies, and other clients. Collaborating with a team of highly skilled software engineers, you will focus on developing solutions that are robust, reliable, and scalable. Your collaboration with product management and design teams will ensure you understand the feature requirements and technical specifications needed to deliver high-quality code on schedule.Our Engineering Culture: We foster an environment of trust and collaboration, where egos are set aside for collective success. Our team thrives on shared challenges and embodies our core values: empathy, simplicity, autonomy, leadership, accountability, insatiable curiosity, a proactive approach, and a mentorship culture. We operate with context rather than control, creating a highly collaborative workspace.

Join Zūm, a dynamic and rapidly growing Series E startup, as we revolutionize the school transportation sector. Backed by prominent investors such as Sequoia Capital, SoftBank, Spark Capital, and GIC, we are on a mission to enhance school district transportation systems across the United States, with a focus on innovation and sustainability. Our operations span over 15 states, including flagship hubs in San Francisco, Los Angeles, and Seattle, as we expand our presence to the East Coast and Midwest. Our technology-driven approach utilizes state-of-the-art solutions to manage school transportation, launch charter platforms, and develop proprietary SaaS products. We are also dedicated to electrifying school transportation fleets, supporting local utilities by reintegrating vital energy into the grid. Recognized as a CNBC 50 disruptor and one of the Financial Times' 500 fastest growing companies, we are poised for significant growth.This position is hybrid, based out of our Redwood City headquarters. Candidates must be available on-site at least three days a week (Monday to Thursday) and must reside in the Bay Area.Who You Are:We are seeking a proactive and skilled Staff Engineer, Backend Platform to enhance our Backend Engineering team. In this role, you will play a pivotal part in developing Zūm’s technology platform, striving for simplicity in solving complex challenges. Our ideal candidate thrives on full ownership of product development, making a notable impact on our business.What You'll Do:Contribute significantly to the design architecture of our Backend platform, collaborating with a team of 2-4 backend developers to deliver robust product features. You will introduce scalable tools and processes to enhance our development speed, partner with Product and Design teams to plan and implement new features, and improve our existing platform while integrating new functionalities. This role demands hands-on coding and encompasses the full development lifecycle—from ideation to deployment—allowing you to witness the immediate impact of your contributions.What You Bring To Zūm:• A Bachelor's degree or higher in Computer Science (or equivalent) and 8+ years of relevant industry experience as a Software Engineer or Staff Engineer.• Demonstrated expertise in building backend systems for enterprise applications, showcasing your ability to deliver effective solutions.

Senior Product Engineer - Backend FocusLocation: Redwood City, CA (Hybrid) or Remote - USTeam: EngineeringType: Full-timeAbout GridCAREAt GridCARE, we tackle one of the most significant challenges in AI infrastructure: power access. As the demand for computing capacity surges, power availability has become a critical barrier to data center deployment. We develop innovative software solutions that empower developers and utility companies to comprehend and unlock imminent grid capacity through advanced physics-based models and cutting-edge data systems.Our dedicated team operates at the crossroads of energy systems, software, and infrastructure, collaborating closely with utilities, developers, and infrastructure providers to transform intricate grid analyses into actionable products that expedite deployment.The RoleWe are seeking a Senior Product Engineer with a strong backend focus to contribute to the development of our customer-facing application layer. This position is pivotal as it bridges our web application with our core modeling and batch-job systems. You will take ownership of features from inception to completion: grasping user and domain challenges, collaborating with teammates to shape workflows, and delivering robust software that our customers depend on.Your expertise should lie primarily in backend development, yet you should be adept at contributing across the stack as project requirements dictate. While design skills are not mandatory, possessing strong product insight and enough frontend knowledge to elevate our growing frontend team through collaboration, code reviews, and establishing clear technical patterns is essential.This role is ideally suited for individuals who have experience developing multi-tenant SaaS products and relish the opportunity to translate complex backend functionalities into user-friendly software applications.What You’ll DoDevelop and enhance the backend-for-frontend / application API layer that powers GridCARE’s web application.Own product features from start to finish, from analyzing user and domain needs to delivering polished, production-ready software.Design and implement HTTP APIs, webhook flows, and status/result delivery mechanisms for uploads, jobs, and other user-centric workflows.Establish typed request/response models and clear contracts between the frontend, API layer, and backend systems.Collaborate with cross-functional teams to ensure seamless integration and functionality.

Join our dynamic team at dstaff as a Software Engineer, where you will play a pivotal role in developing innovative software solutions. As part of a talented team, you will contribute to exciting projects that push the boundaries of technology and enhance user experience.

About the RoleWe are excited to announce an exclusive opportunity for a talented Software Engineer (Windows) to join our dynamic team in Redwood City, CA. This is a full-time, permanent position where you will play a crucial role in enhancing our desktop streaming software, delivering an exceptional streamer/viewer experience.Role Overview:As a member of our Engineering team, you will collaborate closely with Product and client-side engineers to develop cutting-edge desktop streaming solutions that drive content creation.

About the RoleAt Character, we are on a mission to scale personalized AI to billions of users, and monetization is the backbone of our sustainable vision. Our dedicated monetization team is innovating the way users engage with virtual currency, subscriptions, and premium features, ensuring these interactions are intuitive, rewarding, and enjoyable. We’re seeking a passionate Product Engineer who excels at the intersection of product design, commerce, and user experience—someone eager to create and implement systems that not only drive revenue but also enhance overall user satisfaction.If you possess experience with subscriptions, advertising, virtual economies, or in-app purchase systems, and are dedicated to crafting high-quality user experiences, we would love to collaborate with you.What You’ll DoDevelop and enhance user-facing features across mobile and web platforms that facilitate payments, subscriptions, and in-app purchase processes.Design and experiment with monetization interfaces, ranging from virtual currency systems to premium upsells and advertising strategies.Collaborate closely with design and product teams to create delightful, efficient, and trustworthy purchasing experiences.Work with data science teams to define success metrics for monetization, conduct experiments, and analyze results.Partner with backend developers to create scalable and reliable systems for payments, entitlements, and transactions.Uphold a high standard for UI/UX quality, performance, and privacy in sensitive user interactions.Contribute to shaping the company’s monetization experimentation framework, including methodologies for A/B testing and rapid iteration.Who You AreExperienced in consumer product development with a focus on monetization, in-app purchases, or subscription models.Strong proficiency in Typescript, React, React Native, Tailwind, HTML, and modern front-end development practices.Comfortable working on backend services, preferably using Python or Golang, particularly for payment or commerce systems.Proven track record of delivering user-facing features that have driven measurable monetization or engagement improvements.Ability to excel in fast-paced environments, balancing the need for speed with quality and reliability.Excellent communication and collaboration skills across engineering, product management, design, and data analytics teams.Nice to HaveFamiliarity with A/B testing frameworks and data-driven decision making.

Join us in creating a safer world, one incident at a time.At Ambient.ai, we are pioneering a cutting-edge, AI-driven physical security platform designed to empower leading enterprises to mitigate risks, enhance operational efficiency, and extract invaluable insights. Industry giants, including seven of the top ten U.S. technology firms and numerous Fortune 500 companies, depend on our innovative solution to transform their physical security infrastructure.Our platform harnesses the power of advanced AI and computer vision to integrate seamlessly with existing camera and sensor systems, facilitating real-time monitoring and proactive threat detection. By reducing false alarms by over 95%, we allow security teams to concentrate on genuine threats and avert incidents before they happen.Founded in 2017 and supported by prominent investors such as Andreessen Horowitz, Y Combinator, and Allegion Ventures, Ambient.ai is a Series B company dedicated to making every security incident avoidable.Interested in learning more? Connect with us on LinkedIn and YouTubeAbout the Role:Reporting directly to Kiran Palan, you will lead a dynamic team of skilled engineers dedicated to developing products that are revolutionizing the physical security landscape. As an Engineering Leader, you will be at the forefront of creating innovative product concepts while nurturing the growth of existing offerings. Collaborating closely with product managers, you will help define our growth strategy, ensuring alignment of processes and delivery with the product roadmap.In this pivotal role, you will unify internal business partners and leadership around this strategic plan while partnering with cross-functional teams to execute it effectively. Your involvement will be crucial in assessing and maintaining the quality and user experience of our products, all while ensuring agility in our development processes.What You'll Bring:Leadership of the current product engineering team, encompassing front-end, mobile, and back-end developers.Expertise in designing, guiding, and evaluating systems within the broader context of product development.Ability to scale the team effectively, recruiting and onboarding new talent while fostering a high-performance culture among software engineers.Technical proficiency as a hands-on coder, coupled with the ability to coach and mentor effectively.Commitment to ensuring exceptional product quality and user experience through active engagement and leadership.

Join us in creating a safer world, one incident at a time.At Ambient.ai, we are pioneering a cutting-edge, AI-powered physical security platform that empowers leading enterprises to mitigate risks, enhance operational efficiency, and derive invaluable insights. Our technology is trusted by seven of the top ten U.S. tech giants and numerous Fortune 500 companies to modernize their security frameworks.Our innovative platform leverages advanced artificial intelligence and computer vision to integrate seamlessly with existing camera and sensor systems, providing real-time monitoring and proactive threat detection. By drastically reducing false alarms by over 95%, Ambient.ai enables security teams to concentrate on genuine threats, effectively preventing incidents before they happen.Founded in 2017 with the support of industry leaders like Andreessen Horowitz, Y Combinator, and Allegion Ventures, Ambient.ai is a Series B company on a mission to ensure that every security incident is preventable.Interested in learning more? Connect with us on LinkedIn and YouTubeAbout the Role:We are on the lookout for a skilled Full Stack Engineer to contribute to the development and scaling of the essential systems that drive Ambient.ai’s real-time AI security platform. In this dynamic role, you will engage with software that processes and interprets large volumes of video and event data instantly, turning raw signals into actionable intelligence for some of the world's largest enterprises.You will regularly tackle technically challenging problems in a fast-paced, collaborative atmosphere and witness your contributions deployed in mission-critical environments.Your Responsibilities:Design and implement REST and GraphQL endpointsDevelop highly available, latency-sensitive, fault-tolerant microservicesCreate core infrastructure for handling significant volumes of video streaming dataEnhance the performance, reliability, and scalability of all backend servicesTake ownership of small to medium platform features, overseeing them from conception to deploymentCollaborate as a vital member of the platform team, responsible for one or more services/product featuresExpect to be challenged and continuously develop your skills.

Company Overview:Dyna Robotics is a pioneering force in the robotics industry, developing versatile robots that leverage our proprietary embodied AI foundation model. This technology allows our robots to adapt and enhance their capabilities across diverse environments, delivering commercial-grade performance that is unmatched in the sector. Our robots are already making significant impacts across various industries, demonstrating exceptional generalization and performance with our groundbreaking frontier model.Founded by visionary entrepreneurs Lindon Gao and York Yang, who successfully sold Caper AI for $350 million, alongside former DeepMind researcher Jason Ma, Dyna Robotics has secured over $140 million in funding from prominent investors like CRV and First Round. We aim to redefine robotic automation and invite you to join us in shaping the future of AI-driven robotics!Discover more about our innovative journey at dyna.coPosition Overview:As a Senior Robotics Software Engineer at Dyna Robotics, you will take a lead role in the design and development of advanced software solutions that interface seamlessly with our state-of-the-art robotic systems. Your expertise will guide the creation of software for robot control, sensing, and teleoperation, while also crafting tools for remote operation, data collection, and processing. You will collaborate closely with our AI research and hardware teams to bolster the intelligence and reliability of our robotic innovations, contributing significantly to our mission of achieving long-term general intelligence in robotic systems.

Join Box, Inc. as a Software Engineer III where you will play a pivotal role in developing our powerful Query Platform. This is an exciting opportunity to work on cutting-edge technology that supports our mission to make the world’s information accessible and useful.

About DatologyAIAt DatologyAI, we believe that the quality of training data directly impacts the performance of AI models. Our innovative data curation suite is designed to optimize vast amounts of data, effectively reducing training time and costs, while enhancing model accuracy. With our cutting-edge technology, we enable models to achieve performance levels comparable to those trained on significantly larger datasets, all without escalating costs. Our recent successes in text models and image-text models reflect our commitment to innovation in machine learning.Backed by $57.5 million in funding from industry leaders such as Felicis Ventures, Radical Ventures, and Microsoft, our team consists of pioneers in data research and engineering. Our mission is to simplify how organizations train their models, making data curation accessible to all.This position is based in Redwood City, CA, where we foster a collaborative in-office culture four days a week.

Join Poshmark's Innovative TeamPoshmark is at the forefront of the fashion resale industry, creating a dynamic marketplace that connects a passionate community of buyers and sellers through engaging social interactions. Since 2011, we've empowered over 130 million users to transform their closets into successful businesses while promoting sustainable fashion practices. Our platform has facilitated over $10 billion in gross merchandise value (GMV), enabling sellers to earn billions and providing buyers with unique and affordable fashion items. Discover more about our mission at www.poshmark.com and stay updated with our latest news at newsroom.poshmark.com.Our Big Data team plays a pivotal role within Poshmark, dedicated to developing a state-of-the-art data platform that unlocks valuable insights for our business and customers. We are committed to democratizing data access, supporting rapid business growth, providing self-service analytics tools, and driving key initiatives across the organization.We are seeking a talented Senior Software Engineer to join our Data Engineering team. In this role, you will enhance our Datalake infrastructure, ensuring stakeholders have real-time access to high-quality data. This position offers the chance to leverage your software development expertise to create and sustain both real-time and batch data pipelines, focusing on scalability and optimization while collaborating with Data Science, Analytics, and Platform Engineering teams to develop tools for managing petabyte-scale datasets.

Join Poshmark Inc. as a Staff Software Engineer specializing in our Cloud Platform team. In this role, you will leverage your expertise to design, develop, and optimize scalable cloud solutions that empower our users. You'll collaborate with cross-functional teams to create innovative products that enhance the user experience. If you're passionate about technology and looking to make a significant impact in a dynamic environment, we want to hear from you!

Location: Redwood City, CA (Hybrid — 3 days/week in office)Our MissionAt Quilt, we are dedicated to transitioning humanity away from fossil fuel heating. An astounding 20% of the U.S. global warming emissions originate from homes, surpassing emissions from cars. The primary contributor to these emissions is the burning of fossil fuels for heating. To combat climate change, over 80 million homes in the U.S. must shift from combustion-based heating to efficient electric heat pumps in the coming decades.We believe that achieving this transition requires exceptional products that are easy to purchase and adopt. Currently, most heat pumps lack intuitive design, underutilize software, and present challenges during adoption. We are developing a next-generation home heating and cooling system that is not only aesthetically pleasing but also optimized by AI, outperforming existing solutions by a factor of ten.The ChallengeWhile AI agents can generate code at speeds 100 times faster than human developers, our primary bottleneck lies in code verification. At Quilt, we create software that operates on physical hardware within homes. A software bug could mean a family is left without heat. Our codebase encompasses embedded C++ for custom devices, cloud infrastructure, and mobile applications. Currently, much of our verification process relies on manual testing methods, such as physically visiting a test bench to execute tests.Our goal is to build a robust development factory that streamlines code verification.We are seeking a talented Software Engineer to lead our developer infrastructure initiatives. This includes developing simulators, test harnesses, CI/CD pipelines, and verification systems that empower our engineering team (and our AI agents) to deploy features quickly and confidently. Your contributions will be pivotal in enhancing the efficiency and reliability of our software development lifecycle.

Job Title: Robotics Software Engineer II - SimulationDepartment: Software EngineeringJob Level: L4FLSA: ExemptJob Summary:At Bear Robotics, we are on a mission to revolutionize the future of robotics. We are currently looking for a passionate and skilled Robotics Software Engineer II specializing in simulation to join our dynamic team in Redwood City, CA. In this pivotal role, you will be responsible for designing, building, and optimizing scalable simulation infrastructure that evaluates our robotics software stack effectively. You will tackle complex technical challenges and develop high-performance simulation tools and services that enhance the productivity of our internal teams—specifically Robotics Software, Product, and Systems Engineering. Your contributions will be critical in maintaining superior simulation quality, efficiency, and performance across both local and cloud environments.If you are enthusiastic about scalable systems, captivated by the field of robotics, and thrive in fast-paced, collaborative environments, we want to hear from you!Key Duties/Responsibilities:Design, develop, and sustain large-scale simulation infrastructure for robotics applications.Ensure the reliability, latency, and cost-effectiveness of simulation platforms.Enhance simulation performance in local and distributed/cloud environments.Work closely with cross-functional teams to integrate simulation capabilities into development workflows.Assess and adopt open-source simulation tools and frameworks.Create tools and pipelines to optimize simulation operations and boost developer productivity.Perform other related duties as assigned.Supervisory Responsibilities:NoneRequired Skills/Abilities/Qualifications:Strong programming proficiency in Python and/or C++.Solid grounding in data structures, algorithms, and software design principles.Hands-on experience with simulation tools such as Gazebo, Isaac Sim, or CARLA.Familiarity with workload/workflow management systems.Preferred Skills/Abilities/Qualifications:Experience with cloud computing platforms (e.g., AWS, GCP, Azure).Proficiency in containerization tools like Docker and orchestration platforms like Kubernetes.Experience with CI/CD pipelines and automated build systems.Knowledge of distributed computing or data processing frameworks (e.g., Spark, MapReduce).Prior experience in robotics, autonomous systems, or high-growth startups.Advanced degree (Master’s or PhD) in Computer Science, Robotics, or a related field.Education/Experience:Bachelor’s Degree in Computer Science, Software Engineering, or a related field.

About DatologyAIAt DatologyAI, we revolutionize the training of models by addressing the inefficiencies in data usage. Our innovative data curation suite optimally organizes and enhances petabytes of data, ensuring that your training processes are not only faster but also more efficient and cost-effective. Imagine achieving training speeds that are 7-40 times faster while enhancing model performance to levels that feel as if you’ve utilized over 10 times more raw data. Our approach enables smaller models with fewer than half the parameters to outperform their larger counterparts, significantly reducing deployment costs. Explore our latest insights on text models and image-text models.Backed by a total of $57.5M through Seed and Series A funding, our investors include industry leaders such as Felicis Ventures, Radical Ventures, Amplify Partners, Microsoft, and Amazon, along with AI pioneers like Geoff Hinton and Yann LeCun. Our team is at the forefront of research in data optimization, combining expertise in both data science and engineering to simplify data curation for anyone aspiring to train their own models.This position is based in Redwood City, CA, where we embrace a collaborative in-office culture four days a week.

About the RoleJoin Character as a Staff Software Engineer on our AI Platform, where you will engage in a dynamic array of projects at the intersection of software engineering and AI data. Your role will initially focus on three pivotal areas:Assist our research team by creating the essential tools and datasets to train cutting-edge models.Activate our "data flywheel" by developing data pipelines and collaborating closely with ML researchers to ensure our AI models are continually refined and aligned with human feedback.Enhance our data infrastructure, utilizing technologies such as Spark, Beam, and GCP.