full stack ruby engineer jobs in London

Conveo.ai is building an AI research platform used by global brands. We seek a Senior Product Engineer who owns the full stack from interface to infrastructure, shaping product direction with technical impact.You’ll lead frontend architecture in React/TypeScript, design robust APIs, and ship complete features including AI-powered capabilities on AWS/GCP,...

Zapp is hiring a senior full-stack engineer to own end-to-end development for iOS, Android, and web experiences. Join an AI-first company building rapid, customer-focused solutions with NestJS, React, and GraphQL.You’ll work across backend, web, and infrastructure, and bring AI into daily workflows to ship impactful features. We value curiosity, energy,...

BNY is seeking a Senior Associate, Full-Stack Engineer in London. In this role, you will design and maintain backend services while collaborating on frontend development. Key responsibilities include delivering secure, scalable systems and contributing to performance enhancements.Required qualifications include proficiency in Java, knowledge of...

A leading recruitment agency is seeking a Senior Full Stack Engineer for a 12-month remote contract. The ideal candidate has at least 4 years of experience in Python and Flask, along with a strong grasp of SQL databases. Responsibilities include architecting backend services and building responsive front-end interfaces. This role involves mentoring junior...

Starling is recruiting a Full Stack Engineer (ML Ops) in London to join our data-driven fintech teams. You will design and build scalable backend services in Java and robust frontends with React/Redux, deployed on AWS, with a strong focus on reliability and performance.This hybrid role values ownership, collaboration and practical problem solving. We offer a...

Accenture is seeking a Full Stack LLM Development Associate Manager - Anthropic/Claude to design and deploy Claude‑powered web apps, APIs and agentic workflows. You will work across strategy and engineering teams to deliver scalable AI solutions, with emphasis on tool use, context management and secure data integration.You will apply Anthropic SDKs and...

Fin, now part of Salesforce, is on a mission to help businesses provide perfect customer experiences. As a Senior Full Stack Engineer in Team Web, you’ll craft intuitive front-end experiences and build backend systems that power them, collaborating with product marketers, designers, and engineers across the business.You’ll work across UI, APIs, and...

Expedia Group in London is seeking a Software Development Engineer II (Full-Stack) to build React-based user interfaces and backend capabilities. You will own features from requirements through delivery, collaborating with product management, backend teams, platform teams, and brand teams to create configurable components and platform capabilities.The role...

A pioneering e-commerce platform is seeking a Senior Full Stack Engineer to develop impactful features for their pre-commerce platform. You will work across frontend and backend systems, collaborating closely with a small engineering team. The role requires 5+ years of experience in both frontend and backend development, focusing on delivering customer value...

A rapidly growing payments technology company in London is seeking a Senior Full Stack .NET Engineer to enhance their team. This pivotal role involves designing cloud-native applications and integrations, with strong focus on .NET Core, Microsoft Azure, and SQL. The ideal candidate has 5+ years of experience and is excited to influence product strategy in a...

pubX is looking for an experienced backend engineer to design and maintain services for our AI-driven advertising platform. The ideal candidate will have strong backend fundamentals and experience with AWS, Python, and event-driven systems.This role offers fully remote work with a competitive salary, equity opportunities, and support for professional...

Build real, production-grade software that powers our global banking businesses. At JPMorganChase, we believe great engineers are made through meaningful challenges, strong mentorship, and a culture that rewards curiosity and craftsmanship. Here, you'll work alongside experienced engineers who are passionate about clean code, scalable architecture, and...

Admanage.ai is building the Cursor for ad management and empowering brands to launch hundreds of ads quickly across major platforms. This high-ownership full-stack role lets you design and deliver features across the entire product, from database schemas to UI, with a focus on performance, testing, and robust architecture.You'll collaborate directly with the...

Scale is actively hiring for a Full Stack Software Engineer (Forward Deployed) to work directly with public sector partners. You will craft end-to-end AI applications, design scalable architectures and guide secure cloud deployments across multiple regions.Join a mission-driven team shaping AI adoption for citizens and governments. You will be a technical...

Flow Engineering is seeking software engineers to build AI-powered capabilities that help teams author, review, and manage requirements more effectively. You will work on agentic systems engineer and agentic domain engineer workflows—bringing AI into the center of how teams reason about their systems.This role sits at the intersection of AI, product, and...

Mondrian Alpha, a leading hedge fund, seeks a senior software engineer to own internal tools and platforms used across investment and non-investment functions. You will work with business stakeholders to translate pain points into well-scoped technical solutions and own projects from conception to release.You'll be hands-on across the full project lifecycle,...

Dex is seeking a founding-team capable full-stack engineer to build a platform that answers security questions once, with Python on the backend and React on the frontend. You will own the data model and UI, and work directly with the founder and customers to ship value.You will tackle evolving, complex problems across large environments, delivering...

AI Full Stack Engineer – LLMs, Python & Agentic AI Location: London (Hybrid, 2-3 days per week in the office) Salary: Up to £70,000 a year DOE. Employment Type: Permanent, Full Time Sector: Investment Technology Build the AI capabilities of an organisation, not just another chatbot. What if you could help an established investment organisation...

FlexTrade UK Ltd. is seeking an experienced full-stack developer to join the FlexONE team. You will work on Scala/Play backend and React/AG-Grid frontend, contributing from an MVP to a full-featured web and mobile companion app.Based in London with our UI-focused team, you will own design, migrations to React Native, testing, and collaboration with desktop...

FinTech Horizon Ltd. in London seeks a Senior Full-Stack Developer to design, build, and maintain scalable web applications powering our next-generation financial platform.You will collaborate with product managers and UI/UX designers to translate complex requirements into robust technical solutions. Responsibilities include mentoring juniors, optimizing...