Contract Full Stack Java/Python Engineer

Join Our Team as a Full Stack Java/Python Engineer!We are seeking a talented Full Stack Java/Python Engineer for an exciting 6-month contract starting as soon as possible.Work Schedule: 2 days a week in our London office.Key Responsibilities:Leverage your extensive commercial software development experience, demonstrating a strong command of Java and Spring Boot, while crafting robust end-to-end full stack applications encompassing frontend, backend, and APIs.Utilize your proficiency in Python for agent services, orchestration, and LLM integrations.Implement modern frontend frameworks, such as React or Typescript, to deliver high-quality user experiences.Engage with cloud technologies and containerization (AWS/GCP/Azure, Docker), with a preference for candidates with Kubernetes experience.Handle data and retrieval mechanisms, including Postgres/NoSQL, vector databases, embeddings, and semantic search.Collaborate effectively in an agile development environment.Communicate technical challenges and influence decisions within the team, ensuring stakeholder satisfaction.Exhibit a strong understanding of engineering best practices, such as TDD, SOLID principles, and XP methodologies.Our Commitment to Diversity:We are proud to be an equal opportunity employer and encourage applications from all qualified candidates. We actively promote inclusivity and welcome applications from women, ethnic minorities, and individuals with disabilities. We consider all flexible working arrangements, tailored to the needs of the role, and strive to accommodate reasonable adjustments.

Skin + Me is a pioneering technology start-up dedicated to transforming personalized skincare solutions. We have successfully delivered millions of treatments through our diverse multi-brand ecosystem, which includes Skin + Me, Hair + Me, and Renew + Me. Our proprietary technology stack supports everything from our e-commerce platform to in-house manufacturing processes.As we enter an exciting new growth phase, we are seeking a Senior Full Stack Software Engineer to join our dynamic and high-impact team. We leverage cutting-edge tools like Claude Code and Cursor to enhance our modern, fast-paced workflows.Our MissionAt Skin + Me, we prioritize tangible results over mere hours logged. Your objective will be to utilize advanced tools to streamline mundane tasks, allowing you to focus on tackling complex challenges related to scalability, experimentation, and architecture.Your ResponsibilitiesAgentic Workflows: Employ agentic tools to plan, refactor, and deploy features throughout our Python/React stack, significantly enhancing your technical capabilities.Full-Stack Ownership: Architect and implement comprehensive features, managing everything from backend logic and database designs to contemporary frontend user experiences.Drive Engineering Advancement: Contribute to shaping our AI-native development standards and guide the team towards high-velocity delivery practices.Who You AreAI Proficiency: You are adept in utilizing agentic AI, capable of managing edits across multiple files and discerning any inaccuracies from language model outputs.Pragmatic Architect: With your senior experience, you know when to rely on automated tools and when to intervene personally. You appreciate clean code, robust type systems, and comprehensive testing.High Agency: You are a proactive problem-solver who flourishes in a fast-paced, self-directed environment.Technical Skills RequiredExpertise in Python and associated web development frameworks, such as Flask and Django.Experience with relational databases (MySQL preferred) and ORM frameworks (e.g., SQLAlchemy, Alembic).Proficient in TypeScript and React.Experience in building and maintaining frontend design systems.Familiarity with containerization (Docker) and cloud platforms (preferably AWS).Understanding of modern web architecture and performance optimization techniques.Why Join Skin + Me?High Leverage: We equip you with the best tools and the freedom to utilize them effectively.Make a Difference: Be part of a revolutionary company dedicated to enhancing millions of lives.Equity: Every team member has a stake in our success.Perks: Enjoy free breakfast and lunch on office days, a dog-friendly workplace, 25 days of holiday, and an annual £500 development budget.

We are seeking an experienced Senior Full Stack Java Developer to join our dynamic team at Version 1. As a key player in our Apps Modernisation & Integration department, you will leverage your expertise in Java development to build robust applications and integrate innovative solutions that meet our clients' needs.Your role will involve collaborating with cross-functional teams, guiding junior developers, and ensuring best practices in software development. You will work with modern technologies and methodologies that enhance our project delivery.

Role overview Legal & General seeks a Full-Stack Engineer to build and maintain scalable web applications. This position centers on Python and TypeScript, with a strong emphasis on teamwork and collaboration. Engineers in this group play a key part in projects that drive the company's digital growth. What you will do Develop and maintain web applications using Python and TypeScript Work alongside cross-functional teams to deliver software solutions Support active projects and contribute ideas for new initiatives Location This position is based in London.

Application Deadline: We are actively interviewing and looking to fill this position promptly with the right candidate. EXCITING OPPORTUNITYBecome a pivotal member of our newly established AGI Safety Product Team at Apollo Research. In this Full Stack Engineer role, you will collaborate directly with our CEO, who also serves as Head of Product, alongside other talented product engineers and the Evals team to craft tools that enhance AI agent safety at scale for our users. Your contributions will help develop innovative products that monitor AI coding agents for safety and security risks. Joining our small, dynamic team means you'll have substantial influence over both team dynamics and technological direction, with opportunities to quickly take on greater responsibilities.This position is perfect for you if you are passionate about creating products that genuinely enhance AI safety, thrive in fast-paced environments, and enjoy collaborative work with researchers.PRIMARY RESPONSIBILITIESProduct Development- Work alongside the team lead to clarify tool specifications, translating them into robust technical architectures.- Engineer and sustain features across the entire stack, from responsive front-end interfaces (using React) to scalable backend services in Python.- Produce clean, well-documented, and maintainable code that adheres to our rigorous standards for security and performance, while engaging with users to capture their use cases and requirements.Back-End Development- Design and build scalable backend services capable of processing and analyzing extensive AI agent logs.- Develop RESTful APIs and data processing pipelines for AI agent logs.- Create secure API endpoints to facilitate the integration of our tools into customer workflows.- Establish monitoring and logging systems to ensure optimal reliability and performance.Front-End Development- Construct intuitive user interfaces that empower customers to comprehend and act on AI agent safety and security evaluations.- Create interactive data visualizations that effectively convey complex AI behaviors.

Join our innovative team at Spotify for Authors (SFA), the premier platform revolutionizing the audiobook industry. As a Senior Full Stack Engineer, you will play a pivotal role in developing a robust web application that empowers publishers, authors, and narrators with essential tools for catalog management, performance tracking, and content distribution on Spotify. We are on an exciting journey to scale our user base to 100,000, utilizing a cutting-edge React/TypeScript frontend and Java backend services, complemented by data pipelines that enhance our audiobook ecosystem. At SFA, we are directly contributing to Spotify's key initiatives: improving audiobook accessibility, advancing content creation tools, and refining discovery mechanisms. Our philosophy embraces collaboration, where contributions know no boundaries, quality is a shared goal, and we leverage the latest technologies, including AI, to minimize manual tasks and amplify creative expression.

We are seeking a talented Full Stack Developer to join our dynamic team at Vitol, where you will collaborate closely with various business lines. This role presents a unique opportunity to engage with both technical and non-technical experts to create innovative solutions and full-stack applications that are utilized globally across numerous commercial and operational desks. Your contributions will significantly influence decision-making through the development of cutting-edge solutions.In this role, you will play an integral part in transforming our existing application landscape. Your ability to swiftly comprehend business needs, communicate effectively, work autonomously, and rapidly prototype and iterate on new and existing requirements will be essential in delivering state-of-the-art solutions that empower our commercial teams.As a Full Stack Developer at Vitol, you will exemplify:Rapid Prototyping: Collaborate closely with operations and commercial teams to construct and support market-driven business development applications and enhance existing tools by swiftly iterating based on user feedback to create actionable, value-adding solutions.Project Management: Analyze ongoing business and user requirements while independently managing project lifecycles from start to finish within the team.Innovation: Propose innovative and reliable technical solutions that enhance existing processes or uncover new opportunities for the business.Platform Expertise and Integration: Develop a comprehensive understanding of Vitol's Management Information Systems (MIS) platforms and tools, including their functionalities and capabilities, to ensure their success.

Who Are We? At Ki Insurance, our influence can be seen in various groundbreaking headlines. From insuring space shuttles to world tours, wind farms, and even the legs of footballers, our impact is substantial.Our mission aims to digitally disrupt and transform a 335-year-old industry. Collaborating with Google and UCL, we have developed a platform that leverages algorithms, machine learning, and large language models, enabling insurance brokers to receive quotes in mere seconds rather than days.As the largest global algorithmic insurance carrier, Ki is the fastest-growing syndicate within the Lloyd's of London market, achieving a remarkable $100 million in profit within just three years.Our teams consist of diverse talents working in an agile, cross-functional environment, dedicated to delivering the best possible experience for our customers. With ambitious goals ahead, we seek exceptional minds to challenge the status quo and help us explore new heights.Your Role:As a Senior Full Stack Engineer, you'll be an integral part of our development team, contributing to our broker platform, which is vital to Ki's success. Our multi-disciplinary team combines expertise in software and data engineering, full stack development, platform operations, algorithm research, and data science. We focus on delivering impactful features through an iterative and analytical approach.Your Responsibilities: Develop robust and scalable software for critical web-based applications.Create visually appealing, functional, and efficient web and mobile sites that enhance these applications.Design, build, test, document, and maintain APIs and integrations.Implement quality control through industry-standard practices such as automated testing, pair programming, and code reviews.Collaborate with the Product team to translate end-user requirements into effective technical solutions.Document technical designs and analyses.Evaluate current system architecture for growth and improvement opportunities.Construct mock-ups or prototypes for exploring and troubleshooting new initiatives.Engage with the Product team and UX designers to review designs, implement new features, and ensure an exceptional user experience.Investigate new ideas and emerging technologies, rapidly developing prototypes.Promote and enhance the engineering team’s principles and methodologies.Act as a domain expert for Ki’s core technologies.Mentor and coach colleagues in engineering and business aspects.

Join Trainline as a Full Stack Engineer and contribute to the evolution of digital travel. In this role, you will design and implement scalable web applications that enhance user experiences. Collaborate closely with product managers and designers to shape innovative features that meet customer needs.

Join our innovative team at Faculty as a Senior Full Stack Software Engineer. In this pivotal role, you will leverage cutting-edge technologies to design and implement robust software solutions, driving our mission to harness AI for impactful outcomes. Collaborating with cross-functional teams, you will address complex challenges and deliver high-quality products that meet user needs.If you are passionate about technology, enjoy problem-solving, and thrive in a dynamic environment, we want to hear from you!

We are seeking a highly skilled Contract Senior Java / Kotlin Engineer to join our dynamic team.Work Location: On-site, 2 days per week in Spitalfields, LondonKey Requirements: Proven expertise in Java or Kotlin (back-end development) and a strong commitment to Test-Driven Development (TDD).Expected Start Date: Mid MarchAbout Us:At AND Digital, we are a forward-thinking tech company dedicated to enhancing digital delivery and bridging the digital skills gap. Since our inception in 2014, we have empowered organizations to create superior digital products and foster robust digital teams. We pride ourselves on the impactful nature of our work, making a significant difference for our clients through our regional offices (referred to as ‘Clubs’), which enable us to build strong, lasting partnerships. This model has not only driven our clients' success but has also facilitated our remarkable organic growth, expanding our team to over 1,300 professionals across the UK, Europe, and the USA, with ambitious plans for global expansion in the coming years.Join us on our mission to close the global digital skills gap!Your Role:Collaborate within a cross-functional team comprising software developers, technical product owners, and testers, all aligned towards developing JVM applications using Test-Driven Development and Pair Programming.Lead the design and implementation of our systems with a clear understanding of the context and purpose behind each project, while continually seeking opportunities to enhance our systems and workflows.Provide mentorship and coaching to fellow team members.Possess extensive knowledge of Java or Kotlin programming languages (5+ years of experience).Demonstrate in-depth knowledge and hands-on experience working within a cross-functional, agile development team.Have at least 3 years of practical experience in Test-Driven Development and a keen interest in Pair Programming.Equal Opportunities Commitment:We are proud to be an equal opportunity employer and welcome applications from all qualified individuals. We actively encourage applications from women, ethnic minorities, and individuals with disabilities. We are open to discussing flexible working arrangements, depending on the specific requirements of the role. Where reasonable adjustments are required, we will make every effort to accommodate them.

About UsAt Humaans, we are pioneering the future of workplace infrastructure, developing innovative software solutions for rapidly growing companies that operate on a global scale and are venturing into new territories.What initially began as a basic record-keeping system has transformed into a comprehensive platform designed to manage personnel across the globe. Our agentic AI layer, Athena, enhances our capabilities, enabling intelligent orchestration that connects workflows across HR, IT, Finance, and Operations. This empowers organizations to act promptly and confidently, revolutionizing traditional work methodologies.We collaborate with forward-thinking teams across Europe and the US, ranging from AI-driven firms like Lovable, Poolside, Fyxer AI, and Tandem Health to established high-growth companies scaling through international expansion and acquisitions, including Quantexa, Sellpy, Manychat, Gigs, Croud, and Threecolts. These teams are not just purchasing software for its features; they seek leverage—the ability to operate efficiently and effectively as complexities grow.We are proud to have secured $20 million in venture funding from some of the most esteemed entrepreneurs and investors in the technology sector, including Lachy Groom (Physical Intelligence), Stewart Butterfield (Slack), Tobias Lütke (Shopify), Dylan Field (Figma), Jeff Weiner (LinkedIn), Claire Johnson (Stripe), Oliver Jay (OpenAI), Jay Simmons (Bond), alongside Y Combinator, Moonfire, Frontline Ventures, Pathlight Ventures, and Exor.If you possess a strong ambition and are eager to tackle challenging problems with a nimble team during a pivotal moment in our industry, we invite you to join us.Our Technology StackOur current technology stack includes TypeScript, JavaScript, React, Node, Postgres, and Redis. We utilize GitHub for version control and continuous integration, deploying our services on Kubernetes within the Google Cloud Platform. We offer a public REST API, and our web client employs a real-time WebSocket API. We focus on delivering quality user-facing features and their implementation while maintaining a rapid development pace through concentrated efforts and robust foundational tools.Your ResponsibilitiesContribute to shaping the product from concept to launch.Develop end-to-end features, resolve bugs, enhance infrastructure, and provide customer support.Write backend TypeScript using Node, Postgres, Redis, and Kubernetes.Implement frontend TypeScript in React.Expand our third-party integration marketplace.Participate in technical architecture planning.Assist the sales and marketing teams.

About StackOne:StackOne serves as the AI Integration Gateway for SaaS products and AI Agents. Supported by GV and Workday Ventures with $24M in funding, we empower creators of SaaS platforms and AI Agents to implement hundreds of scalable, precise, and enterprise-grade integrations. Our platform fuses 25,000 pre-mapped actions across 200 connectors, an AI-driven integration development toolkit, and robust security measures, including real-time architecture, managed authentication and permissions, and comprehensive observability.Become part of our rapid journey to redefine the future of agent-driven integrations.With an AI-native integration toolkit that ensures real-time execution, managed authentication, granular permissions, and full observability, all grounded in safety, we are intensifying our focus on AI R&D and establishing our own lab to expand the possibilities of tool calling for agents: training specialized LLMs that excel beyond general-purpose models in critical areas: precision, reliability, and safety in agentic execution.About the RoleWe are seeking adept full-stack engineers who are quick to deliver, possess a systems-oriented mindset, and are passionate about scalability, performance, and usability. You will develop core APIs, enhance infrastructure, and create developer tools and user interfaces that facilitate easy, secure, and predictable tool execution.This role encompasses a wide scope: primarily backend-focused, product-savvy, and highly technical. Anticipate engaging with APIs, authentication, infrastructure, and frontend development to construct the foundational elements that enable agents to take tangible actions.

Overview Join Tipalti, a dynamic fintech company located in the heart of London, dedicated to automating financial workflows for small and medium-sized businesses. Our engineering culture is robust, collaborative, and focused on making a tangible impact for our clients. As a Senior Full-Stack Engineer, you will merge hands-on engineering skills with a product-oriented mindset. You will define requirements, engage in technical discussions, and influence user experiences while managing the entire software development lifecycle. Responsibilities Develop robust, efficient, and well-tested code across the technology stack. Create new features and enhancements that align with product priorities. Participate in design and architecture discussions, shaping the technical direction. Review code with team members, ensuring clean code practices and quality standards are met. Collaborate closely with Product Managers to clarify requirements and propose solutions. Proactively identify questions, edge cases, and assist in refining specifications. Provide technical insights into prioritization and product decisions. Communicate effectively with designers, engineers, and stakeholders. Share knowledge and mentor colleagues as needed. Engage with external partners and vendors for integration work when necessary. Requirements Experience building across the full stack and a keen interest in learning new technologies. A passion for writing clean, maintainable, secure, and well-tested code. Strong collaboration skills and a preference for team environments. A curiosity about customer needs and the ability to translate them into technical solutions. A commitment to continuous learning and knowledge sharing within the team. Preferred Tech Skills Proficiency in JavaScript / TypeScript, Node.js, and React (or similar frameworks). Experience with REST APIs or microservices architecture. Familiarity with MongoDB. Knowledge of cloud services, particularly AWS. Why Join Tipalti? An open, inclusive, and supportive engineering culture.‍ Opportunities to build products utilized by some of the world’s fastest-growing companies. Equity options in a late-stage scale-up.

Hello! Welcome to Team Granola If you haven't yet, we invite you to explore our innovative platform and discover why joining us could be the right move for you.We are on the lookout for a passionate engineer who thrives in a dynamic, fast-paced environment where creativity and innovation are encouraged.In this pivotal role, you will devise new strategies to maximize user satisfaction through the application of LLMs and improve the overall performance of our platform. You will engage directly with users to identify their challenges and tailor solutions that address their needs. As a key member of our founding team, you will play a significant role in scaling Granola to accommodate the next 100x users.Your Responsibilities:Lead the development of user-centric features from conception to launch, focusing on areas such as agentic workflows and real-time collaboration, including innovative prototyping.Enhance the application for optimal performance, ensuring speed, scalability, and reliability.Collaborate with users to understand their needs and design effective solutions.Work alongside a diverse team of engineers, product managers, designers, and other stakeholders to craft a groundbreaking product.Your Ideal Background:Hands-on engineering experience in tech-focused companies.Strong skills in TypeScript, Node.js, and React.js (familiarity with Framer Motion, Tailwind, and Radix is a significant advantage).Solid understanding of relational databases, specifically Postgres.Experience with cloud technologies (preferably AWS and Terraform).As a Person, You:Are a dedicated builder at heart.Enthusiastic about working in our London office most of the time.Enjoy the startup environment, ideally with prior experience in early-stage companies or a strong interest in the zero-to-one phase.Appreciate collaborating with kind, ambitious, and practical individuals.Have a keen interest in AI/ML, though direct experience is not mandatory.Thrive in a fast-paced atmosphere where priorities and requirements are ever-evolving.Join us in revolutionizing the way users interact with technology!

Hello! Who are we?At Ki Insurance, our innovations are making headlines globally. From insuring space shuttles and world tours to safeguarding wind farms and even footballers’ legs, we cover it all.Our mission? To disrupt and revolutionize a market that has existed for 335 years. In collaboration with Google and UCL, we have developed a cutting-edge platform that utilizes algorithms, machine learning, and large language models to provide insurance brokers with quotes in mere seconds instead of days.As the largest global algorithmic insurance carrier and the fastest-growing syndicate in the Lloyd's of London market, we proudly achieved $100 million in profit within three years.Our diverse teams collaborate in an agile, cross-functional environment, striving to create the ultimate customer experience. With big ambitions ahead, we need brilliant minds to help us challenge the status quo and reach new heights.What’s your role?As a Staff Full-Stack Engineer on our Engineering team, you'll provide technical leadership for delivery squads and the broader engineering organization. Together with our engineering leadership, you will uphold engineering excellence and maintain high-quality standards through a culture of continuous improvement. You'll be hands-on, delivering impactful software directly and leading initiatives independently.Your responsibilities will include:Creating robust and scalable software for critical web-based applications.Developing engaging, efficient, and reusable web and mobile sites that enhance our applications.Designing, building, testing, documenting, and maintaining APIs and integrations.Implementing quality control measures through automated testing, pairing, and code reviews.Collaborating with the Product team to translate end-user requirements into effective technical solutions.Documenting technical designs and analyses.Evaluating current system architecture to identify areas for growth and improvement.Building mock-ups or prototypes to explore and troubleshoot new initiatives.Working closely with Product teams and UX designers to ensure top-notch user experiences.Exploring new ideas and emerging technologies to develop prototypes rapidly.Fostering a culture of continuous improvement throughout the team.

Full-Stack Software Engineer at AmebaJoin Ameba as a Full-Stack Software Engineer and be part of a transformative journey in the supply chain industry. At Ameba, you will have the unique chance to develop innovative software solutions that shape the way products move from raw materials to finished goods. If you're intrigued by the behind-the-scenes mechanics of the world, we want to hear from you!We are a dynamic startup led by seasoned entrepreneurs who have collectively raised over $160 million and come from top-tier companies like Meta, Palantir, and Microsoft. With ambitious goals and strong backing from prestigious investors in Europe, we have secured more than $9 million since our inception just over a year ago.Your Role as a Full-Stack EngineerIn this pivotal role, you will partner closely with our CTO and engineering team to conceptualize, develop, and launch products. You will engage with various technologies across the stack, including front-end development with React and TypeScript, back-end services powered by Kotlin and Python, and machine learning initiatives. Our fast-paced startup environment allows features to go from concept to user-ready in just a week, so you should be comfortable with rapid iterations and eager to create products that resonate with users. Don't worry if you lack experience in certain areas—your enthusiasm and willingness to learn are what matter most!Life at AmebaWe are committed to providing competitive salaries and substantial equity packages to all team members. Our focus is on building a streamlined team of highly skilled individuals, ensuring that we reward them generously.We value collaboration and prefer in-office work five days a week for effective communication, while still offering flexibility for remote work when needed. Our priority is establishing a robust office-first culture at this stage.Enjoy 28 vacation days annually, along with a complete two-week shutdown during the holiday season for everyone to recharge.We offer four months of parental leave at full salary for both maternity and paternity.Our healthcare benefits include comprehensive medical and dental coverage.The salary for this role ranges from £80,000 to £130,000 plus generous equity options.

Role Overview Join us as a Full Stack Engineer at Theodo, where you'll have the chance to work directly with clients, including CEOs and co-founders, to understand their unique requirements and develop tailored solutions. You'll engage in hands-on learning from day one, guided by seasoned developers who will mentor you in managing your own projects. As you progress, you'll take on greater responsibilities, mentor junior developers, and become a key technical advisor within your team. If you excel at solving complex problems and are eager to expand your technical skill set while tackling new challenges, this is the opportunity for you.In this role, you will be part of a small, dynamic team focused on creating innovative web and mobile applications for our clients. Collaboration with agile and technical coaches will be essential as you build scalable solutions using the latest technologies.

Join Burendo, an award-winning consultancy renowned for crafting remarkable products and services through cutting-edge technology. We partner with organizations to enhance their value delivery and foster exceptional customer experiences. Our mission is straightforward: to empower organizations to create a meaningful impact on people, society, and the planet by leveraging efficient, user-friendly technology that quickly resolves challenges.At Burendo, we believe in the power of collaboration to achieve extraordinary outcomes.Our unique approach distinguishes us. We pride ourselves on a pragmatic delivery mindset—thinking big, planning effectively, adapting swiftly, and maintaining a sharp focus on results, regardless of the complexity involved. We are passionate about driving innovation, questioning conventional wisdom, and nurturing collaboration at every phase. At Burendo, our commitment to people is central to our mission. We value partnerships, welcome diverse perspectives, and uphold fairness in all interactions. We are eager to share our knowledge, using our expertise to empower others and facilitate long-term success for organizations.We recognize that exceptional engineers come from diverse backgrounds, each bringing unique specialties. At Burendo, we are embarking on exciting new projects, and we seek individuals eager to contribute across the technological spectrum and engage in all phases of the software development lifecycle.

Join our dynamic team at Faculty as a Full Stack Software Engineer. In this role, you will have the opportunity to work on both the front-end and back-end of our innovative software solutions. You will collaborate with cross-functional teams to design, develop, and maintain applications that enhance our clients' experiences. Your expertise in various programming languages and frameworks will be essential in driving our projects forward.