Senior Full Stack Software Engineer (Python / React)

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 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.

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!

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.

At Zoopla, we adopt a hybrid working model, dedicating three days a week to our Tower Bridge office.As one of the UK’s leading property brands, Zoopla is recognized and trusted by over 91% of the population, and we are committed to winning over the remaining 9%. Our mission is to empower individuals to make informed home decisions by connecting them to personalized insights for moving, managing, or financing their homes. With over 50 million monthly visitors, Zoopla provides exclusive data and comprehensive listings on every UK property, including over 500,000 homes for sale and rent, helping users find the best agents and secure competitive mortgage deals.We are a vibrant and growing team that thrives on innovation and is eager to redefine the digital property landscape. Join us in transforming how the nation approaches home decisions.Position Overview: Full-Stack EngineerAs a Full-Stack Engineer at Zoopla, you will enhance the consumer portal experience, developing a high-performance website and various services. If you thrive in a commercially-focused organization and are passionate about core web vitals, developer experience, APIs, pipelines, personalization at the edge, or crafting delightful UIs with the latest CSS techniques, we want to hear from you.At Zoopla, we utilize a diverse array of technologies, and while we don’t expect you to be proficient in all of them, we welcome your expertise in even a few of the following:On the frontend, you will work with React, React Native, Nx, Vercel, and TypeScript. On the backend, we employ Node.js, Next.js, GraphQL (all in TypeScript), as well as Golang and Python. We are particularly seeking candidates who are skilled in React Native to enhance our mobile application experience. Our data architecture includes both SQL and NoSQL databases, and you will be supported by our data and Core Infra/Platform teams while engaging with AWS, GitHub/GitLab, CI, and increasingly serverless technologies.A flexible approach across various layers of the stack is essential for this role. If you are eager to expand your full-stack development skills, we are here to support your growth.

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 our dynamic team at hyperexponential as a Full Stack Engineer, where you will be instrumental in developing innovative software solutions using Kotlin and React. This role involves collaborating with cross-functional teams to design, implement, and maintain high-quality web applications that meet our clients' needs. You will have the opportunity to work on exciting projects that push the boundaries of technology while fostering your professional growth.

Become Our Foundational Engineering Leader at Civic Marketplace!Are you driven by the potential of technology to foster significant change within communities? At Civic Marketplace, we are innovating the process by which local governments acquire and provide essential services, crafting the most user-friendly and effective procurement platform for the future.Why Choose Civic Marketplace?We are a mission-oriented startup dedicated to reshaping the operational landscape for local governments—eliminating obstacles, streamlining workflows, and ultimately enhancing outcomes for citizens. If you thrive in a startup environment and wish to join a purpose-driven team effecting genuine change, this role is tailored for you.Who We’re Seeking:We are in search of our inaugural engineering hire—a proactive technical leader prepared to take full ownership of our technology landscape. You will spearhead our technical vision, enhance our codebase, and assemble a high-performing team to achieve our ambitious objectives. You will be a pivotal figure in our expanding organization, with the autonomy to define our technological strategy and architecture.Key Responsibilities:Lead the execution of our full-stack development initiatives, ensuring seamless ownership of code from inception to deployment. You will be our full-time lead engineer, collaborating with teams to facilitate execution through the establishment of effective processes, setting clear expectations, managing risks, resource allocation, and removing impediments.Craft a quality assurance playbook for your teams, establishing standards for code reviews, pull requests, testing, and monitoring. You will actively contribute to coding while also delegating tasks and hiring talent as necessary, including working with freelancers.Demonstrate proficiency in REACT, marketplace dynamics, payment infrastructure, and hybrid development approaches utilizing both custom and no-code/low-code solutions.Ensure your team manages the operation of data, systems, and applications in production, driving the resolution of critical issues through root cause analysis.Foster hiring, motivation, and professional growth among team members by developing a deep understanding of their motivations, strengths, and growth opportunities. Align personal growth opportunities with organizational impact.

Flatiron Health is hiring a Senior Full Stack Software Engineer for its London office. This role centers on building data-driven tools and products that support better cancer care. The team’s mission is to improve and extend lives by drawing insights from the experiences of people affected by cancer. About Flatiron Health Flatiron Health works with cancer centers across the US, Europe, and Asia, transforming real-world patient data into evidence that can inform care and research. Teams include oncologists, data scientists, software engineers, epidemiologists, and product specialists, all collaborating to advance oncology. What You’ll Do Design and build technology solutions with engineering teams based in the US, UK, Germany, and Japan. Work closely with oncologists, clinicians, product leaders, and quantitative scientists to solve technical and business challenges. Help shape team roadmaps and contribute to ongoing technical improvements. Support the growth and culture of Flatiron’s European engineering teams. Develop creative approaches to complex problems in healthcare technology. Iterate quickly on products while following engineering best practices for quality and security. Work with complex data pipelines and a range of data processing tools. Bring or build deep knowledge of the UK healthcare landscape, especially around data sources, security, privacy, and new trends. Who We’re Looking For Full Stack Software Engineer with 4-8 years of relevant experience. Comfortable working in a fast-moving setting and able to think creatively and adapt quickly. Interested in a technology-driven culture that values innovation and measurable business impact. Experienced in agile development and object-oriented programming languages such as Python, Java, C#, or SQL, and open to learning new technologies. Knowledge of healthcare systems, especially in the UK, is a plus. This role offers the chance to work alongside experts from multiple disciplines and make a meaningful contribution to cancer care through technology.

Join our dynamic team at bbc-maestro, a leading SME with a global clientele, as a Senior Full Stack Engineer. Your primary mission will be to enhance and maintain our core platforms while collaborating with a talented group to craft scalable software that truly resonates with our users.In this role, you will actively engage in building and maintaining our Ruby on Rails platform and React Native mobile app infrastructure. You will also play a pivotal role in shaping our technical direction, mentoring your teammates, and ensuring high-quality delivery.This position is ideal for individuals who thrive in environments that encourage autonomy, love tackling real-world user challenges, and wish to have a hand in guiding technical decisions while remaining immersed in coding.You will report directly to our Engineering Manager.

Role overview Legal & General is seeking a Senior Full Stack Software Engineer based in London. This position centers on crafting and delivering software solutions tailored to a range of client requirements. The role combines hands-on coding with close teamwork alongside colleagues from various backgrounds. What you will do Design and build software systems, working on both front-end and back-end components Work with cross-functional teams to create dependable products Guide and mentor junior developers, sharing technical knowledge within the group Support and improve software development best practices

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.

About UsAt Perlego, we are a dedicated team of nearly 100 professionals striving to democratize education. We believe that access to high-quality, affordable learning materials is essential for unlocking potential. Knowledge should be readily available, free from exorbitant costs.Over the last seven years, we have focused on empowering students across the UK and Europe to enjoy access to quality books. Following our recent $20 million funding round, we are excited to expand our reach to students globally, particularly in the US, while developing a platform that transcends traditional books, enabling students to study more effectively.Position OverviewWe are seeking a talented Software Engineer with proficiency in JavaScript, React, NextJS, Node.js, TypeScript, AWS, and Test-Driven Development (TDD). You will become a key member of our learner Tribe, collaborating within a squad dedicated to leveraging data-driven insights to enhance our technical SEO initiatives, improving the experience for logged-out users and optimizing payment subscription processes for our direct-to-consumer customers.Working EnvironmentOur teams operate in cross-functional squads, all focused on achieving common data-driven objectives. This role will join a squad made up of 4 Engineers, an Engineering Manager, a Data Engineer, a QA Engineer, a Designer, and a Product Manager.Technology Stack:NextJSReactTypeScriptNode.jsAWSPreferred Qualifications:Experience with Stripe payment systemsFamiliarity with Optimizely A/B testing toolsKey QualificationsYou are a great fit if you possess:A solid background in developing high-performance web applications using JavaScript, React/NextJS, Node.js, and TypeScript.A deep understanding of architectural principles such as Microservices, REST, object-oriented, and functional programming, as well as relational and NoSQL database design.Extensive experience with AWS and other cloud computing platforms.Expertise in modern JavaScript development techniques and tools.Experience in ideation and executing A/B tests to assess the impact of various features and monetization strategies.Experience working in an Agile environment emphasizing Test-Driven Development and CI/CD practices.Commercial experience as a software engineer.The ability to communicate complex technical issues in a simplified manner to non-technical stakeholders.⭐ Bonus Points If You Have:A degree in a computing-related field.Experience in technical SEO or payment-related projects.Experience in a startup setting.

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.

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.

About UsAt Humaans, we are revolutionizing workplace infrastructure with our cutting-edge software tailored for rapidly scaling, global companies. What began as a record-keeping system has transformed into a comprehensive platform that empowers organizations to manage their workforce more intelligently. Our AI-driven tool, Athena, enables seamless orchestration across HR, IT, Finance, and Operations, allowing teams to act swiftly and confidently as they navigate their growth.We collaborate with dynamic teams across Europe and the US, including innovative AI companies like Lovable and Poolside, as well as established firms such as Quantexa and LinkedIn. Our clients seek more than just software; they look for the ability to scale efficiently and effectively amidst increasing complexity.Having secured $20 million in venture funding from renowned leaders and investment firms, we are poised for significant growth. If you are driven by ambition and eager to tackle challenging problems within a fast-paced environment, this is the opportunity for you.Our Technology StackWe leverage a robust tech stack that includes TypeScript, JavaScript, React, Node.js, PostgreSQL, and Redis. Our development process is streamlined with GitHub for version control and continuous integration, deploying on Kubernetes via Google Cloud Platform. We maintain a public REST API and utilize a real-time WebSocket API for our browser client. Our commitment to detail ensures high-quality user-facing features, while our focused approach enables rapid progress.Your Day-to-Day ResponsibilitiesContribute to product development from concept to launch.Develop end-to-end features, troubleshoot issues, enhance infrastructure, and provide customer support.Utilize backend TypeScript with Node.js, PostgreSQL, Redis, and Kubernetes.Implement frontend features using TypeScript and React.Help expand our third-party integration marketplace.Participate in technical architecture discussions.Assist sales and marketing teams as needed.

Senior Full-Stack Software EngineerJoin Deliveroo on our exciting journey to revolutionize shopping and dining experiences, where innovation, impact, and growth are at the forefront of our mission. Our Engineering teams face intricate technical challenges in a vibrant, global marketplace, crafting and optimizing systems that cater to millions of customers, riders, and partners every day.From real-time logistics to robust infrastructure and marketplace optimization, we engineer technology that fuels Deliveroo’s expansive growth.We are seeking a Senior Full-Stack Software Engineer to become a vital part of our London team. In this role, you will be instrumental in building and scaling high-performance features across our entire technology stack, ensuring an exceptional experience for our customers, partners, and riders.Discover more about our Engineering team — our motivations, work culture, and what you can expect from us.

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.

Join Scopely as a Senior Full-Stack Software Engineer and be part of our innovative Monopoly GO! game team, working remotely from the UK or Portugal. Our diverse team comprises talented individuals from the UK, Spain, Portugal, and the US, all dedicated to creating engaging gaming experiences. At Scopely, we are passionate about our mission to inspire play every day, both in our collaborative work environment and through our connections with our global community of players. We pride ourselves on being a worldwide team of game enthusiasts who are at the forefront of the mobile gaming industry, connecting millions of users daily. Monopoly GO! is one of our flagship casual games, boasting a player base of over 10 million daily active users. Our European and US-based team collaborates daily to deliver captivating experiences for our players. The Team: We are expanding our cross-functional team focused on game integrity. In this role, you will collaborate with cybersecurity experts, data engineers, product managers, and technical leadership to ensure that our game remains safe and fair for everyone. Our Tech Stack: Unity mobile game with a .NET/C# back-end Extensive use of AWS infrastructure (EC2, Memcache, Dynamo, Redis, ElasticSearch, etc.) CI/CD pipeline utilizing GitHub Actions, Bamboo, Spinnaker, and more Monitoring with tools such as Datadog, Bugsnag, Kibana (OpenSearch), and AWS console

About the Role Abound is hiring a Senior Full Stack Engineer in London. This position focuses on building and improving web applications, working across both front-end and back-end systems. The team values practical solutions and a collaborative approach. What You Will Do Design and implement scalable web applications Work with cross-functional teams to deliver new features Contribute to both front-end and back-end development Help create a strong user experience through thoughtful engineering What We’re Looking For Solid experience with both front-end and back-end technologies Comfort working closely with colleagues from different disciplines Ability to deliver reliable, maintainable code