Backend Software Engineer - Application Development

Join Palantir Technologies as a Senior Backend Software Engineer and contribute to our innovative application development team. You will design and implement robust backend systems that are scalable and efficient, working alongside talented engineers in a collaborative environment.

Join Duffel as a Backend Software Engineer and play a pivotal role in shaping the future of travel technology. We are seeking passionate individuals who thrive on solving complex challenges and are excited about creating scalable and efficient backend systems.

Your ContributionThe Senior Software Engineer III (Backend) plays a pivotal role in tackling intricate tasks and is instrumental in advancing the objectives of their team. This role includes leading small projects or components while crafting robust feature sets that adhere to high architectural quality standards.Key ResponsibilitiesAdvanced Software Development: Actively participate in the design and implementation of sophisticated software solutions, ensuring optimal functionality, scalability, testability, and reliability. Assist with system design and grooming processes.Code Quality and Optimization: Enhance and maintain code quality through thorough review practices, optimization strategies, and adherence to industry best practices.Innovative Problem Solving: Tackle complex technical challenges with creative solutions.Collaboration and Communication: Collaborate effectively within the engineering team and across various departments, working alongside other engineers, product managers, and stakeholders.Continuous Learning and Adaptation: Stay current with emerging technology trends and continuously enhance skills and knowledge.Technical Documentation: Produce and maintain comprehensive technical documentation for clarity and accessibility.

Why Choose PlayStation?At PlayStation, we pride ourselves on being not just the best place to play, but also the best place to work. As a recognized global leader in entertainment, we proudly produce the PlayStation family of products and services, including PlayStation®5, PlayStation®4, PlayStation®VR, PlayStation®Plus, and critically acclaimed software titles from PlayStation Studios.We are dedicated to fostering an inclusive environment that empowers a diverse workforce. We welcome individuals who are passionate about innovation, technology, and gaming to explore our open positions and join our expanding global team.PlayStation is a brand under Sony Interactive Entertainment, a wholly-owned subsidiary of Sony Group Corporation.We are on the lookout for a talented Software Engineer to join our game integration platform, bridging gameplay and platform experiences! As a member of the Partners Platform team, you will work at the intersection of business and engineering on the PlayStation SDK Windows Delivery tooling.In this role, you will contribute to the development of the SDK Manager Windows Application, coordinating with business and engineering teams to enhance the relationship between SIE and our game development and publishing partners.Role Overview:We are seeking a skilled C# Software Engineer to design and develop Windows-based applications that facilitate the delivery and integration of SDK components for Sony PlayStation platforms. This position requires robust experience in C#, along with a solid understanding of C and C++ for low-level integration and performance-critical components.Key Responsibilities:Design, develop, and maintain Windows desktop applications using C# and the .NET framework.Create tools and interfaces to support the integration and delivery of PlayStation SDK components.Utilize native code (C/C++) to interface with low-level systems and SDK libraries.

Join Our Team as a Senior Application Engineer / DeveloperAre you passionate about crafting cutting-edge AI and cloud-native applications that leave users in awe? Are you eager to explore the frontiers of software delivery, AI engineering, and innovative application patterns? If you have a knack for developing intelligent applications that push the boundaries of technology, we want to hear from you!In this dynamic role, you will be at the forefront of building AI-driven solutions, focusing on hands-on development to create applications that challenge the status quo.Key Responsibilities:Design, build, test, and deploy state-of-the-art applications.Transform software delivery processes in the AI and cloud era.Evaluate AI code generation for accuracy and functionality.

We are seeking a Principal Software Engineer specialized in engineering applications to join our dynamic team at physicsx. In this role, you will lead the design and development of innovative software solutions that empower our engineering teams to achieve exceptional results. Your expertise will drive the implementation of cutting-edge technologies and methodologies, ensuring the highest standards of performance and reliability.As a Principal Software Engineer, you will collaborate closely with cross-functional teams, mentor junior engineers, and contribute to the overall technical strategy of our organization. You will have the opportunity to work on challenging projects that have a significant impact on our business and clients.

Join our dynamic team as a Senior Software Engineer specializing in Backend development. In this role, you will collaborate within our autonomous agile teams to craft the services that drive the Blacklane platform. Your contributions will enhance our back-office systems and address integration challenges for our business partners.Our Tech Environment: Our technology stack includes Ruby, Go, TypeScript, and Java, all structured using Domain-Driven Design (DDD). These services are deployed on Kubernetes and communicate via domain events using SQS and Kafka. We utilize a variety of data storage solutions including PostgreSQL, MySQL, Elasticsearch, Redis, and DynamoDB. Our cloud infrastructure is primarily based on AWS, with provisioning managed through Terraform.YOUR CHALLENGE:Address unique challenges to customize our products for specific markets.Maintain high standards through thorough test coverage, documentation, code reviews, and knowledge sharing.Dedicate time to optimizing performance, usability, and maintainability of the systems you oversee.Focus on personal development by acquiring new skills and technologies.Collaborate with a motivated, open-minded team committed to enhancing travel experiences for our guests.ABOUT YOU:You are proactive, curious, and a collaborative team player.You have at least 5 years of experience with two or more programming languages.You are proficient in at least one of the following languages: Ruby or Go.You possess knowledge of the HTTP protocol and have experience with REST APIs.You write high-quality, maintainable code and are familiar with the challenges of distributed systems.You are eager to learn more about event-driven architecture and domain-driven design.You have experience with Docker and containerized environments; knowledge of Kubernetes and Terraform is an advantage.

Join a Transformative CompanyAt Palantir, we are pioneers in crafting the world's foremost software for data-driven decision-making and operational efficiency. Our innovative platforms connect vital data with those who require it, empowering our partners to develop life-saving pharmaceuticals, anticipate supply chain disruptions, locate missing children, and much more.Your RoleAs a Full Stack Engineer specializing in application development within Palantir Foundry, you will play a crucial role in shaping tools utilized by thousands to create advanced applications that drive their enterprises. You will design and implement user interfaces, manage state, and establish access patterns to facilitate data-intensive workflows that are both powerful and user-friendly. Your responsibilities may include interviewing users to comprehend their needs and identifying areas for product enhancement, as well as collaborating with colleagues to devise solutions for complex user experience challenges across various sectors.Daily, you will tackle intricate technical challenges, defining solution designs and incrementally delivering new features. You will take ownership of APIs and schemas that empower your front-end functionality, or collaborate with back-end engineers to develop them collectively.We seek engineers who are passionate about addressing real-world challenges and enabling both application builders and end-users to work at their best. Here are some examples of the impactful product work you will engage in:Frontline ProgramAs a Foundry Software Engineer, you may have the unique opportunity to participate in the Frontline program. This exclusive, short-term assignment places you directly with customers, allowing you to collaborate with users and gain invaluable insights into product applications and the challenges faced by our clients. Unlike conventional engineering roles, Frontline immerses you in complex, ambiguous problems, empowering you to deliver significant solutions across some of the world’s most critical industries and institutions.

alten seeks a Backend Software Engineer for its Space Department in London. This role centers on developing software solutions that contribute to important projects and advance the team's technology. Role overview The Backend Software Engineer will work on building and maintaining systems that support the department's ongoing initiatives. The position involves collaborating with colleagues to deliver reliable and effective backend solutions. Location This position is based in London.

xai seeks a Backend Engineer in London, UK to focus on API development. This role involves designing and building APIs that form the backbone of the company’s products and services. Key responsibilities Design and implement APIs to support xai’s solutions Collaborate with frontend developers and product managers to ensure seamless feature integration Optimize API performance and maintain reliability This position offers the chance to work closely with both technical and product teams, shaping the way xai’s services communicate and perform.

About Us: At Breakroom (https://www.breakroom.cc), we are on a mission to create a more equitable world by ensuring every job is a good job. We are developing a community-driven rating system for jobs globally, providing essential information to empower individuals in their career advancements while assisting employers in fostering positive work environments.With over 3 million users comparing their jobs and more than 18,000 employers rated across the UK and the US, we are committed to building an inclusive and top-tier team. We welcome applicants from all backgrounds.Position OverviewAs we prepare to launch Breakroom in the US, we are expanding our engineering and product development team. We seek passionate individuals who want to be part of an early-stage team focused on scaling our operations in a new market. Your responsibilities will include:Designing, writing, deploying, and maintaining high-quality codeCreating internal tools and refining our processesProviding your technical expertise to influence product and team decisionsOur technology stack includes Elixir, using the Phoenix web framework, alongside Postgres, Redis, Google Pub/Sub, and Elasticsearch. While familiarity with Elixir/Phoenix is preferred, we are committed to supporting you in learning these technologies on the job.Work CultureWe adopt a lightweight agile methodology in product development, heavily relying on data for informed decision-making while prioritizing user experiences. Our team thrives on collaboration, working closely with designers, product managers, and fellow engineers. To facilitate this teamwork, we operate from our Spitalfields office in London on Tuesdays and Wednesdays. We release updates multiple times a day and encourage engineers to engage fully in the lifecycle of their projects.Key RequirementsTo excel in this role, you should:Be driven by our mission to create equitable workplacesPossess 5+ years of experience in web software developmentHave in-depth knowledge of backend programming languages, including Elixir, Ruby, Python, or Node.jsHave experience with full-stack web frameworks like Phoenix, Ruby on Rails, or DjangoHave a track record of developing complex features and servicesCommunicate complex technical ideas effectively across diverse teamsHave experience managing operations for high-traffic websitesWork well in cross-functional teamsBe available to support Breakroom during off-hours as neededPreferred Qualifications:Experience working on consumer-facing applications

Join a Transformative OrganizationAt Palantir, we create groundbreaking software that revolutionizes data-driven decision-making and operations. Our platforms empower partners to develop life-saving medications, anticipate supply chain disruptions, locate missing children, and much more by delivering crucial data to those who need it most.About the RolePalantir Foundry is an all-encompassing platform designed for data-driven decision-making. We are redefining how organizations securely integrate their data, enabling them to construct reliable and essential applications on a unified foundation. Our clients utilize Foundry to conduct in-depth analyses that drive core operational strategies. They can also develop sophisticated applications such as operational dashboards, alert management systems, and resource allocation tools powered by advanced machine learning models.As a Senior Front End Software Engineer specializing in application development for Foundry, you will play a key role in designing the tools employed by thousands of users to create the advanced applications that fuel their businesses. Your responsibilities will include architecting and developing user interfaces, managing state, and implementing access patterns to facilitate data-intensive workflows that are both powerful and user-friendly. One day, you may engage with users to gain insights into their needs and pinpoint product enhancements; the next, you could collaborate with your teammates to address intricate UX challenges by integrating customer feedback and insights from various industries.You will routinely tackle complex technical challenges that require you to outline solution designs and identify incremental steps for delivering new features. This includes owning the APIs and schemas that underpin your frontend code and collaborating with backend engineers to develop them.We seek engineers who are dedicated to solving real-world issues and enabling both developers and end-users to achieve optimal results. If you are passionate about creating reliable, high-performance, and scalable systems, as well as designing robust APIs and primitives, this role offers a unique opportunity to significantly influence our products and the individuals who utilize them.Frontline OpportunityFoundry Software Engineers may have the chance to participate in Frontline, a distinctive program that offers a short-term assignment with customers. This immersive experience allows you to work directly with users, gaining valuable insights into how our products are applied and the challenges faced by our clients. Unlike traditional engineering roles, Frontline exposes you to complex, ambiguous problems, empowering you to innovate solutions that directly enhance user experiences.

Please note that this position necessitates relocation to our Milan office.About SatispaySatispay is on a mission to transform the way people manage everyday payments, making them straightforward, equitable, and accessible for all. Our vision has evolved to redefine the future of financial transactions.We are a dynamic movement empowering millions, driven by a collective mission to address significant challenges. Our approach is swift, courageous, and collaborative, fostering an environment where innovation thrives.Joining the Core Team means engaging with essential systems that manage interactions with external banks, orchestrate payments, and create the foundational infrastructure for Identity and Access Management (IAM). This team also oversees critical risk management functions, including credit risk assessment and fraud detection.If you’re eager to craft impactful solutions that serve as the bedrock for our product teams, you’ve found the right place.Your RoleAs a Senior Backend Software Engineer within the Core Team, you will be pivotal in developing the backbone of our payment platform. You will ensure the technical excellence and timely delivery of complex systems that influence multiple services and product teams throughout the organization.Your daily responsibilities will include:Engineering Core Platform Domains: You will help design and evolve our most sensitive systems including the Transaction Ledger, IAM, and Payment Orchestration, ensuring they remain high-performing, scalable, and functional for product team integration.Scaling Risk & Financial Engines: You will optimize and develop services dedicated to bank integrations, credit risk, and real-time fraud detection, constructing robust logic to safeguard our financial ecosystem.Cross-Team Technical Leadership: You will lead technical analyses for projects that span multiple services, facilitating discussions and producing comprehensive documentation (Smart Papers) to ensure clarity and robustness in your designs.Collaborative Development: Engage actively with product teams to refine requirements and enhance the overall system architecture.

At Elliptic, we are pioneering the development of AI-driven tools that empower compliance teams to swiftly and confidently investigate cryptocurrency transactions. Our Automation Forge team is at the forefront of this innovation, crafting backend systems and AI integrations that support Elliptic's copilot, enabling investigators to track fund flows, identify trends, and manage risk in real-time.We are seeking a dedicated Backend Software Engineer to join our team and contribute to the design and implementation of APIs, workflows, and services that facilitate these capabilities.Your Impact:As a Software Engineer within the Automation Forge team, you will play a key role in designing and delivering robust, scalable services that underpin Elliptic’s copilot and other AI-enhanced functionalities.Collaborating with product managers, frontend engineers, and your technical lead, you will transform complex blockchain data into intuitive, user-centric solutions that assist compliance teams in tracing fund flows, revealing intricate patterns, and responding to risks with agility and assurance.By working collaboratively across various disciplines, you will contribute to the development of impactful features while consistently enhancing the quality, reliability, and usability of our platform. Your efforts will be instrumental in advancing Elliptic’s mission to create safer, more transparent, and efficient cryptocurrency markets.Your Responsibilities:Design, develop, and maintain backend services and event-driven systems utilizing TypeScript and Node.js.Build APIs and workflows that seamlessly integrate AI and LLM frameworks to enhance Elliptic's copilot and other intelligent features.Optimize and query data models across both relational and NoSQL databases.Work alongside cross-functional teams to bring features from concept to production.Participate in technical design reviews, planning sessions, and code reviews to continually enhance system quality.Contribute to infrastructure and observability practices within the team, ensuring shared responsibility for the performance of services in production.Your Qualifications:3–6 years of backend engineering experience specifically with TypeScript / Node.js.Strong API design expertise — you have developed and maintained production APIs and understand how to interface with external systems.Proficiency in data modeling — comfortable designing, optimizing, and querying data across various databases.Excellent collaboration skills — able to work effectively with diverse teams and communicate technical concepts clearly.

Join Freetrade as a Backend Software EngineerAt Freetrade, we are on a mission to revolutionize the investment landscape, making it accessible and affordable for everyone. Investing shouldn’t be a complicated or costly endeavor, and we are here to change that.As we expand our team, we seek passionate individuals eager to redefine how our users invest and enhance their financial growth. If you thrive on tackling intricate challenges and creating innovative solutions, you will be a perfect fit.2026 marks a significant milestone for us as we progress with our partnership with IG Group, which allows us to operate independently while leveraging the expertise of an established leader in the investment sector.This year, we are fast-tracking our development roadmap, introducing exciting features such as mutual funds, bonds, and family investment tools. We are also delving into the potential of AI to elevate our customer experience.Why Join Our Engineering Team?Become part of a transformative team shaping the future of investments. As a Software Engineer, you will be instrumental in developing and maintaining a robust, scalable platform that serves thousands of users daily. We confront complex technical challenges, foster innovation, and create solutions that genuinely matter. Here, your code powers the decision-making of investors across the UK. Join us to bring ideas to life.We are searching for a skilled Software Engineer to join our Backend Engineering team.Our Core Tech Stack:NodeJS/TypescriptGoogle Cloud PlatformPostgresqlKey ResponsibilitiesDeliver high-quality software solutions within deadlines, addressing complex challenges by evaluating multiple solutions and trade-offs to aid your team in making impactful technical decisions.Effectively tackle technical problems, providing scalable and maintainable solutions while balancing competing demands.Gain a thorough understanding of your product’s core features and KPIs, collaborating closely with the Product Manager to drive development.Be prepared for an on-call environment, addressing high-priority issues and knowing when to escalate as necessary.About YouYou hold a degree in Computer Science or a related field (or equivalent experience).You have a solid understanding of software development principles and practices.You are a proactive problem solver with a strong desire to learn and improve.

Wayve Technologies is seeking a talented Application Software Engineer to join our innovative team. This role involves designing, developing, and maintaining advanced software applications that drive our cutting-edge technology in the field of autonomous vehicles. Candidates must be passionate about cutting-edge technology and eager to contribute to transformative solutions.

Join Edra: Pioneering Solutions in Enterprise AIAt Edra, we're tackling one of the most challenging issues in enterprise AI: while AI models are inherently generic, company processes are uniquely specific. Our mission is to develop AI agents that comprehend how these processes operate and effectively manage their tasks.As a Series A startup, we are proudly supported by Sequoia and other prestigious venture capital firms. With our teams expanding in New York and London, we are a highly technical group comprising engineers, AI researchers, and strategists who all uphold a rigorous standard for talent. We believe that exceptional individuals are the cornerstone of our future success.Your RoleWe seek dedicated Backend Engineers who are passionate about the art of software development. Your focus will be on implementing strong typing, thoughtful API design, and robust data modeling. You will not be developing AI models; instead, you will construct the surrounding ecosystem: the platform, workflows, interfaces, integrations, and observability that render our AI applicable in real-world scenarios. As one of the early engineers at Edra, you will have the opportunity to influence not only the product but also the engineering culture, tooling decisions, and technical frameworks upon which our company is built.Our approach is intentional and thorough. There is no distinction between 'building it' and 'shipping it'—you will oversee the journey from conceptualization to deployment, taking full ownership of your outcomes. We prioritize thoughtful development over speed, striving for a balance between velocity and quality.Key ResponsibilitiesDesign and implement platform systems utilizing Python (FastAPI), including API contracts, database schemas, and infrastructureDevelop and sustain connectors, integrations, and data pipelines that link our platform to external systemsCreate internal libraries, tools, and interfaces that enhance the productivity of the engineering teamTake full ownership of your work by gathering context, managing dependencies, and driving tasks to completion independentlyEngage in multiple roles across the stack—design a schema in the morning, develop the API layer in the afternoon, and troubleshoot a deployment issue by day’s endParticipate in weekly product meetings, understand user interactions with your creations, and help shape future developmentsCollaborate daily with a small, elite team of engineers and AI specialistsHave a direct impact on the technical direction: select tools, establish patterns, and define conventions for the team

At Zaizi, we are on the lookout for a highly skilled Senior Backend Software Developer who possesses exceptional technical expertise and a genuine enthusiasm for enhancing user experience and outcomes. In this role, you will take ownership of your deliverables while also collaborating with a multidisciplinary team to foster innovation and share creative ideas.Our work environment is inclusive, modern, friendly, and democratic, where we value bright, positive-thinking individuals with a proactive mindset. If you thrive on challenges and aspire to excel in your field, you will find a perfect fit with our team!

Join Zaizi as a Senior Backend Software Developer, where you'll leverage your robust technical expertise while enhancing user experiences and outcomes. You will be a dependable contributor to your projects and an innovative thinker within our collaborative multidisciplinary team.At Zaizi, we foster an inclusive, modern, and friendly work culture that values fresh ideas and a proactive mindset. If you are passionate about pushing your limits and excelling in your role, you'll thrive in our environment!