Backend Engineer, API

About xAIAt xAI, we are dedicated to developing artificial intelligence systems that can profoundly comprehend the universe and support humanity's quest for knowledge. Our dynamic team is small yet highly driven, committed to engineering excellence. We seek individuals who are eager to challenge themselves and thrive on curiosity. With a flat organizational structure, every team member plays an essential role in contributing to our mission. We value initiative, consistent excellence, strong work ethic, and effective prioritization skills. Additionally, strong communication skills are paramount, as team members must share knowledge concisely and accurately with one another.About the RoleThe xAI Tooling team, also known as Starfleet, is in search of a backend engineer who will play a critical role in designing, developing, and maintaining robust and scalable backend systems. These systems will empower our researchers, engineers, and product teams to build, experiment with, and deploy cutting-edge AI models and applications more efficiently. You will take ownership of high-impact tooling projects, including internal APIs, data pipelines, orchestration layers, and tooling platforms that enhance workflows for training, inference, evaluation, and deployment. If you are passionate about creating foundational tools that accelerate the development of the world's most powerful AI systems, this role offers a unique opportunity to make a significant impact at the forefront of AI innovation.

Our VisionAt Tinder, we believe in the excitement of forging new connections. Our mission is to keep the spark of human interaction alive, empowering millions across the globe to discover meaningful relationships. With a community of tens of millions of users, hundreds of millions of downloads, over 2 billion swipes, and more than 20 million matches daily, our influence spans across 190+ countries and is continually expanding.We collaborate to tackle intricate challenges. Beneath the surface simplicity of each match lies a profound exploration of human relationships, behavioral science, AI and ML, safety online and offline, cultural diversity, and the complexities of love and connection.Internship DurationThis internship will take place from June 1 to August 28, 2026.Work EnvironmentThis is a hybrid position that requires in-office collaboration three days a week in either Los Angeles or Palo Alto, California.Role OverviewAs a Backend Engineering Intern at Tinder, you will work closely with experienced engineers, contributing innovative solutions to enhance our backend infrastructure. We are committed to refining our architectural design and adopting cutting-edge technologies to continually evolve our application and redefine how people connect globally.

At Inflection AI, we are committed to enhancing human well-being and productivity through innovative AI technologies.The future of AI is rooted in trustworthy agents that represent our interests.We are at the forefront of this evolution, developing human-centered AI models that blend emotional intelligence (EQ) with analytical intelligence (IQ), thereby transforming interactions from mere transactions to meaningful relationships, ultimately delivering lasting value for individuals and businesses.Our current projects include:Pi, your personal AI, designed to be a compassionate companion that enriches daily life through practical support and insights.Our Platform — featuring large-language models (LLMs) and APIs that empower developers, agents, and enterprises to integrate Pi's emotional intelligence into contexts where empathy and human understanding are paramount.We are dedicated to creating a future of AI agents that build trust, foster understanding, and generate aligned, long-term value for all stakeholders.About the RoleAs the Director of IT & Internal Tools, you will architect and manage a secure, high-integrity infrastructure that will support Inflection’s workplace as we enter a new phase of global expansion. This is a highly technical leadership position for a proactive innovator who excels in execution—building robust systems, automating intricate workflows, and serving as “Customer Zero” for our cutting-edge AI technologies. Reporting directly to the COO, you will transform our internal infrastructure into a strategic advantage that enhances our organizational integrity. By crafting an intelligent and seamless employee experience, you will drive productivity and establish a benchmark for operational excellence in an AI-first environment.

About the RoleTo provide effective support throughout the internship, we are only considering candidates based in Singapore or Europe.Join our remote Middle-end / Tooling team, where you will focus on enhancing the observability of Dune, the OCaml build system. This role goes beyond surface-level changes; you will delve into Dune's core to illuminate its building processes, making intricate OCaml projects more comprehensible.

Join ridealso as a Senior Validation & Tools Engineer in our dynamic DevOps team, where innovation meets excellence. In this pivotal role, you will leverage your expertise to enhance our validation processes and develop cutting-edge tools that drive our operations forward. Collaborate with cross-functional teams to ensure the highest quality standards while embracing the fast-paced nature of DevOps.

About ALSO.At ALSO, we are redefining electric mobility. Originally a part of Rivian, our passionate team comprises builders, dreamers, and innovators dedicated to creating groundbreaking, vertically integrated small electric vehicles (EVs) that address today's and tomorrow's global mobility challenges. Our vision is to inspire individuals to choose ALSO, transforming local car, truck, and SUV journeys into experiences on vehicles that are more affordable, enjoyable, and 10-50 times more efficient.As a Senior Validation & Tools Engineer specializing in web and cloud validation, your role will be pivotal in ensuring exceptional quality across our interconnected e-mobility platform. You will oversee everything from the initial customer interaction during purchase to the cloud systems that drive our vehicles. Your responsibilities will include designing and executing both manual and automated tests for web applications, APIs, and cloud integrations, as well as validating data telemetry and end-to-end connectivity. Collaborating closely with developers, data analysts, and product teams, you will enhance the reliability of every release and promote automation and monitoring to accelerate validation processes.This highly collaborative role requires the ability to seamlessly transition between web and IoT domains. You should enjoy converting complex testing protocols into scalable frameworks and dashboards while possessing the independence and initiative to drive projects and ensure successful implementations.

This is a hybrid position based in our Palo Alto office, requiring in-office attendance on Tuesdays and Thursdays.Why This Role Stands Out?Join a rapidly expanding team at Grindr, where our user base has surged by 30% in the past year! We are in search of a seasoned Backend Engineer who is enthusiastic about building, testing, and deploying robust features alongside our Product team. This is your chance to tackle intriguing challenges, engage with cutting-edge technologies, collaborate with a talented team, and make significant contributions.Key Responsibilities:Become an integral part of a backend team of over 10 engineers, focusing on vital features that cater to millions of active daily users.Lead projects and mentor fellow engineers in implementing new functionalities while closely collaborating with product and design teams.Take ownership of designing and developing Grindr’s backend services within a stable and scalable microservices architecture.Work closely with Product Managers, Designers, and fellow Engineers to refine feature design and functionality.Enhance Grindr's platform using tools such as Redis, Postgres, and Kafka on AWS services.Drive innovation through data-informed decisions regarding new technologies, architectures, and workflows.Ensure high availability of Grindr’s platform by utilizing distributed systems and infrastructure engineering, while playing a pivotal role in optimizations, cost reduction, and incident management.Guide and mentor team members through pairing sessions, code reviews, and architecture discussions.What We Value in You:A minimum of 7 years of experience as a Software Engineer with a focus on Backend Systems (Service APIs, Data Processing, Messaging Services).Proven experience in designing and implementing large-scale systems for high load and data consistency within a microservice architecture.Expertise in designing systems that leverage Cloud Services, preferably AWS.A strong passion for software and system testing.In-depth understanding of concurrency concepts and associated trade-offs.A natural curiosity for troubleshooting and comprehending systems end-to-end.

Senior Backend Software EngineerDepartment: Engineering | Location: Palo Alto HQ | Type: Full-time, On-siteAbout the RoleAt Pika, we are seeking a talented Senior Backend Software Engineer to play a pivotal role in enhancing our core infrastructure that supports our innovative products. You will be instrumental in the design and development of robust, scalable backend systems, overseeing everything from API design and service architecture to real-time messaging infrastructures and platform integrations. This is a high-stakes position where your decisions will directly influence the experiences of millions of users interacting with Pika.In this senior position, you will also elevate the team’s capabilities through architecture guidance, comprehensive code reviews, and mentoring opportunities for junior engineers.What You'll Do• Design and develop scalable backend services that drive Pika's web, mobile, and multi-platform offerings.• Manage backend logic from end-to-end, including database modeling, API design, infrastructure decisions, and ensuring production reliability.• Create and implement real-time systems, including WebSocket connections, event-driven architectures, and messaging queues for low-latency communication.• Optimize infrastructure to enhance throughput, reduce latency, and ensure reliability as Pika continues to grow.• Enhance internal tooling and automate operational processes to streamline team workflows.• Lead technical decisions by drafting RFCs, assessing trade-offs, and building consensus within the engineering team.• Mentor and guide engineers through code reviews, architectural advice, and collaborative programming sessions.• Troubleshoot, optimize, and future-proof systems to handle increased scale.What We're Looking For• A minimum of 5 years of backend engineering experience, specifically in building production services at scale.• Expertise in modern backend technologies (Node.js, Python, Go, etc.) and frameworks (Express, FastAPI, etc.).• A solid understanding of distributed systems, including event-driven architectures, message queues, and service-to-service communication.• Profound knowledge of database design and operations (SQL, NoSQL, data modeling, performance tuning).• Familiarity with APIs, cloud infrastructure (AWS, GCP), Kubernetes, and CI/CD workflows.• Experience in building real-time systems using WebSockets, long-polling, and pub/sub patterns.• Excellent debugging and observability skills; you can trace problems across services efficiently.• A proactive ownership mentality — you identify issues and implement solutions without waiting for specifications.• Strong communication skills and a collaborative mindset.Nice to Have• Experience with AI/LLM integration (model orchestration, token management, prompt routing).• Familiarity with multi-tenant SaaS platforms or multi-platform products.• Experience building internal tools or automation pipelines.• Previous experience in a startup environment, comfortable with ambiguity and rapid movement.

Backend Software EngineerConfluera is an innovative cybersecurity startup backed by Series B funding, dedicated to safeguarding the cyber landscape. Our mission is to fortify enterprises today to ensure a more secure tomorrow. We provide a comprehensive solution that enhances visibility across cloud environments, empowering cybersecurity leaders with real-time attack prevention capabilities.Key Responsibilities- Design and construct distributed systems capable of processing vast amounts of data.- Develop, maintain, and optimize APIs and systems for scalable product enablement.- Create advanced models and features to improve anomaly detection accuracy.- Collaborate and communicate effectively with Product, Design, and Engineering teams.- Rapidly develop and iterate on solutions while upholding high-quality standards.Required Qualifications- Proficiency in programming languages such as Java and Python.- Experience with streaming platforms like Kafka.- Familiarity with stream processing frameworks, including Spark.- Understanding of distributed systems architecture.Preferred Qualifications- Prior experience working with streaming and stream processing systems (Kafka, Spark, etc.).- Knowledge in building ETL pipelines.- Experience delivering and maintaining large-scale production systems.- Leadership experience in technical projects.Educational Background- A Bachelor's or Master's degree in Computer Science, Computer Engineering, or a related field, or equivalent professional experience.

Role Overview Pylon is looking for a Backend Engineer focused on integrations to help expand connections with a range of platforms. This role centers on designing and building backend systems that support seamless integrations and reliable data flows. What You Will Do Develop backend solutions that enable integrations with external services and platforms Collaborate with teams across engineering, product, and other functions to deliver integration features Contribute to the stability and scalability of backend services that support Pylon’s business Location This position is based in Palo Alto.

About the Role Pylon is looking for a Backend Engineer focused on Underwriting to help build and improve backend systems that support our underwriting operations. This position is based in Palo Alto. What You Will Do Work closely with teams across the company to design, implement, and refine backend systems for underwriting Develop solutions that prioritize scalability and efficiency Align backend architecture with Pylon’s business objectives

xAI Inc. develops AI systems aimed at deepening understanding of the universe and supporting learning. The team operates with a focus on engineering quality, open knowledge sharing, and direct contributions. Initiative is encouraged, and leadership grows from consistent, high-quality work. Clear communication, a strong work ethic, and effective task prioritization are core values. Role overview The Backend Engineer - API will build and maintain scalable, reliable production infrastructure for xAI’s backend systems. The primary backend stack uses Rust, and experience with compiled languages such as Rust, C++, or Go is especially valued. What you will do Design and operate production infrastructure that supports xAI’s backend systems at scale Work with Rust (preferred), C++, Go, or similar compiled languages Share technical insights and collaborate closely with teammates Tackle engineering challenges proactively and take ownership of solutions Prioritize tasks and deliver results independently Requirements Experience designing and operating scalable production infrastructure Hands-on knowledge of Rust, C++, Go, or similar compiled languages Strong communication skills Proactive problem-solving and ownership mindset Ability to prioritize and work independently Location This position is based in Palo Alto, CA.

Company OverviewAt Flow, we are redefining the essence of living, working, and connecting. Flow transcends traditional real estate; we are a dynamic brand, a cutting-edge technology platform, and a comprehensive operational ecosystem that encompasses condominiums, hotels, multifamily residences, and office spaces. Our vision is to create a new living experience that is adaptable, interconnected, and designed to foster authentic community and significant value for our residents.Our mission revolves around the concept of oneness: prioritizing the needs and experiences of our residents while nurturing connections with their neighbors and the natural environment. By placing people at the heart of everything we do, we are cultivating vibrant, human-centered communities where life, work, creativity, and leisure harmoniously coexist.Position SummaryAs a Senior Backend Software Engineer at Flow, you will play a pivotal role in developing robust backend systems to support our expanding operations. You will collaborate with cross-functional teams to design and implement secure, scalable, and resilient services. This position requires a proactive approach to problem-solving, a keen eye for optimization, and a strong sense of ownership over your work.We believe that collaboration enhances success. All roles at Flow require an onsite or in-office presence.

Whop is building a unified platform for payments, business launches, and networking, serving individuals and enterprises in over 144 countries. The company processes more than $3 billion in annual payouts and continues to grow rapidly, backed by major investors such as Insight, Bain Capital Ventures, A*, Peter Thiel, and Tether. The team includes experienced entrepreneurs and product leaders from Meta and Robinhood. This Backend Engineer position centers on the Ads Pixel team in Palo Alto, CA. The role focuses on building and maintaining the systems that power Whop’s business growth by ensuring accurate, real-time data flows between Whop, business owners, CRMs, and advertising networks. What you will do Manage and expand the event pipeline that sends Whop’s first-party conversion data to integrated ad platforms and CRMs. Design and build new data destinations, handling authentication, schema mapping, identity matching, deduplication, retries, and backfilling. Improve match rates by advancing identity resolution, hashing, and normalization processes. Increase observability to track event delivery, matching, and attribution across conversions and destinations. Work closely with the ad networks team to connect ad spend with results. Requirements 5+ years in a software development role. Comfortable working in a startup setting where information may be incomplete. Strong curiosity and a drive to improve the product. Proven ability to ship fast, reliable software with close attention to detail. Experience in backend engineering, especially with data pipelines and real-time data processing. Learn more about Whop at whop.com.

Location: Palo Alto, CA About Woven by Toyota Woven by Toyota is leading Toyota’s transformation into a mobility company. The organization focuses on human-centered innovation to improve how people move and live. Key initiatives span four areas: AD/ADAS: Autonomous driving and advanced driver assistance technologies Arene: Software development framework for software-defined vehicles Woven City: A living laboratory for mobility innovation Cloud & AI: Digital infrastructure supporting collaboration and data-driven work Woven by Toyota’s vision is to create a safer world with fewer accidents and a higher quality of life for all. About the Release & Triage Team The Release & Triage team turns real-world signals and incidents into actionable insights for engineering. The sub-team focused on Release & Triage Tooling builds AI- and data-driven tools to support release qualification, simulation-based testing, and failure analysis. Close collaboration with Release, Triage, and core development teams keeps the mainline stable and continuously improving. Role Overview: Software Engineer, AI-Driven Release & Triage Tooling This mid- to senior-level Software Engineer will design and build internal tools using AI/ML and large language model (LLM) techniques. These tools analyze complex signals from logs, metrics, test results, images, and videos. The goal: help QA and development engineers quickly understand failures, identify regressions, and make sound release decisions. The role involves managing services and workflows that support release qualification and triage at scale. Work will integrate with CI/CD systems, simulation platforms, and internal data pipelines. This engineer will also help define best practices for responsible AI-driven analysis within the team.

Join a Transformative CompanyPalantir Technologies is at the forefront of developing cutting-edge software that enables organizations to make data-driven decisions and streamline operations. Our innovative platforms empower partners to tackle significant challenges, such as developing lifesaving medications, predicting supply chain interruptions, and locating missing persons.Role OverviewAs part of Palantir's defense product division, you will contribute to mission-critical applications designed for modern military operations. Our products facilitate secure data integration and visualization, allowing for the creation of complex systems, including common operating pictures, alert triaging systems, and resource allocation tools powered by advanced machine learning models. These tools are essential for daily operations in military command centers and on the battlefield, relied upon by our global clientele.As a Backend Software Engineer at Palantir, you will play a pivotal role in reshaping how organizations harness data. You will engage in every phase of the product lifecycle, from conception and design to prototyping and deployment. Collaboration is key; you will work alongside both technical and non-technical team members to grasp our clients' challenges and develop effective solutions. We promote inter-team mobility to foster the sharing of insights, skills, and experiences, allowing you to expand your knowledge across various technologies and product facets. You will work autonomously, making independent decisions while being supported by a community that encourages your growth as a technical contributor and engineering leader.Your daily tasks will be dynamic, adjusting to user demands and technical challenges. One day, you might join forces with fellow engineers to design a new system that supports a unique workflow; the next, you could be optimizing performance for low-latency operational requirements.Our Product Development teams consist of small groups of Software Engineers, each dedicated to specific product aspects, collaborating to enhance user workflows and continuously improve our software's efficiency and reliability.We are seeking passionate engineers eager to tackle real-world challenges and empower developers and end-users to maximize their productivity. If you are driven to create reliable, high-performance, and scalable systems while designing robust APIs and components, we encourage you to apply.

Join Protegrity, a trailblazer in data protection, as we harness the power of AI and quantum-resistant cryptography to revolutionize data security across diverse environments including cloud-native, hybrid, on-premises, and open-source systems. By utilizing cutting-edge cryptographic techniques such as tokenization, format-preserving encryption, and quantum-resilient methods, we aim to make sensitive data not only secure but also accessible and trustworthy.At Protegrity, you will collaborate at the forefront of innovation, making significant contributions to the industry while working with a team of exceptional professionals. Together, we are reshaping the future of data security, empowering organizations to flourish in a GenAI landscape where data is the most valuable asset. If you are prepared to influence the future of data security, Protegrity welcomes you.We are seeking an experienced, motivated, and inquisitive DevOps Software Engineer with expertise in backend API development, microservices deployed on Kubernetes, Generative AI (GenAI), and Large Language Models (LLMs). A strong dedication to data security, privacy, and safety is essential - WE WANT YOU!In this role, you will focus on the integration and maintenance of GenAI backend microservices within Kubernetes, developing and maintaining engineering solutions for products that ensure the safe and secure use of GenAI by our customers.

Join our innovative team at vinci4d as a Backend Engineer specializing in Data Systems and APIs. In this role, you will play a crucial part in designing, implementing, and maintaining robust data systems that power our applications. You will collaborate with cross-functional teams to build scalable APIs that enhance user experiences and support our mission to deliver cutting-edge technology solutions.

Join us in revolutionizing healthcare. At Qualified Health, we are pioneering the possibilities of Generative AI within the healthcare sector. Our advanced infrastructure establishes crucial guidelines for safe AI governance, tailored agent development, and real-time monitoring of algorithms, collaborating with prominent health systems to effect real change. This role transcends a mere job; it's a chance to forge the future of AI in healthcare, tackle intricate challenges, and create a meaningful impact on patient care. If you are driven, innovative, and eager to accelerate progress, we would be thrilled to have you on our team. Be part of shaping the future of healthcare.