You'll work with FastAPI, TypeScript, React, OpenAI/Anthropic, PostgreSQL, and Azure to build AI agent systems—from voice interfaces to workflow orchestration—for aircraft maintenance and manufacturing. Fleetcraft builds infrastructure that helps technicians maintain and manufacture aircraft.

You'll work with FastAPI, Pydantic, TypeScript, React, OpenAI/Anthropic, PostgreSQL, Turbopuffer, Promptfoo, and Azure. The team builds AI agent systems and core infrastructure for aircraft maintenance and manufacturing, from voice interfaces to workflow orchestration.

You'll work with Python and/or TypeScript, using full-stack JavaScript or backend Python. The role is a founding engineer at a stealth AI company backed by a £100M bootstrapped founder with three successful exits.

Lead a team of 8 senior engineers using React, TypeScript, Python, FastAPI, Dagster, dbt, Snowflake, and AWS. The company fuses fragmented UK transport data into an operational intelligence layer for councils and highways authorities. This role includes architectural ownership and a path to CTO as the team scales toward 20-30 engineers.

You'll work with JavaScript, TypeScript, React, HTML5, CSS, and server-side rendering to build production web applications and responsive interfaces. As a founding engineer at Hyre AI Limited, you'll shape the frontend architecture from an early stage.

Build a new category of SaaS using React on the frontend and Python with Django, Flask or FastAPI on the backend, with cloud technologies desirable. The company uses AI and machine learning to help businesses predict revenue, drive customer loyalty, and capture value from existing customers.

Lead Front-End Developer with React and TypeScript, working on payment and point-of-sale technology for live events. Responsible for front-end architecture, design system, shared component library, payment flows, and real-time data integrations. Will mentor a small team and own tooling, standards, and CI/CD release pipelines.

You will work with JavaScript/TypeScript, SQL/NoSQL databases, and cloud infrastructure across frontend, backend, data pipelines, and APIs. The team builds an AI-powered investment platform for retail investors to create, backtest, and automate personalized strategies. The FCA-authorised company also integrates with financial data, payments, and custody platforms.

Fletchers Solicitors★4.1 (83)via Jack & Jill· London

You will work with Python, FastAPI, Azure, and Fly.io to design scalable backend applications and data pipelines for Fletch AI, a suite of NLP and LLM-based tools that automate legal claims in personal injury and clinical negligence. As a player-coach, you will lead a team of 8+ engineers, overseeing technical direction, site reliability, and production deployment of ML models.

You'll work with Python (FastAPI), Postgres, Redis, Docker/Kubernetes, and AWS. As a founding London engineer, you'll own production services and build scalable backend systems for a commodity e-commerce and electronic trading platform provider.

You will use Python or JavaScript with low-code platforms like Zapier or n8n and integrate LLMs and AI via REST APIs. You will identify and automate manual inefficiencies across the business, building internal automation ecosystems at Goodlord, a platform used by around 3,000 letting agents.

You will build production services in **Python/FastAPI** and ship using agentic AI tools like **Claude Code** and **Cursor**. The role is for a PropTech startup that acquires and backs local property management businesses, providing shared tech infrastructure. You’ll work on the core CRM and finance systems that unify the group, with end-to-end ownership in a small, high-autonomy engineering team.

Work with Python, SQL, AWS, ETL pipelines, data lakes, and enterprise integration tools. You will own legacy data pipelines, ingestion, and integration for a VC-backed AI startup building software for a safety-critical sector, handling fragmented real-world infrastructure from backend systems to warehouse and schema design.

You will work with Agentic Claude Code, Python, AWS, and FastAPI to build backend services and APIs for a healthcare AI platform. The role involves directing AI agents to design, build, and ship software, owning architecture, and setting standards for the team.

You will own an existing production React/TypeScript application across web, iOS, and Android, integrating with Python/FastAPI backends and managing CI/CD pipelines. The team builds a computer-vision platform that turns video data into actionable insights. You will drive frontend architecture on a small, collaborative engineering team.

Work with C#, Python, TypeScript, or JavaScript; APIs; databases; and Git. Build features across the frontend and backend for JivPad, an AI-powered communication platform providing real-time call assistance and in-person language translation.

You will build frontend applications using React and TypeScript, develop reusable UI components, and work on real-time features with WebSockets and GraphQL. The company builds a suite of real-time products for enterprise customers in specialized financial markets. The small, experienced engineering team offers significant ownership from day one.

Zencargo★1.8 (6)· London

Works with TypeScript, Python, Kotlin, AI-assisted development tools, APIs, webhooks, databases, n8n, LLM apps, cloud infrastructure, Terraform, and CI/CD. Embeds with operations teams to automate freight and supply-chain workflows, replacing manual processes with software and AI-driven solutions. Integrates with internal Zencargo services, carrier platforms, and third-party APIs.

You will work with TypeScript, Python, Kotlin, APIs, webhooks, databases, event-driven workflows, AI-assisted tools, n8n, LLM apps, and cloud infrastructure. This role embeds with operations teams to solve freight logistics problems by turning manual workflows into automated, AI-handled platform logic.

Work with LangChain, RAG, FastAPI, React, DuckDB, GCP, Python, and production LLMs. Build agentic AI systems automating digital forensics and incident response investigations for an AI-native security company. This is a 0-to-1 founding role shipping across the full stack.

You will build and deploy production trading infrastructure using Python, FastAPI, Postgres, Redis, Docker/Kubernetes, and AWS. As a founding member of the London engineering team, you'll design and own high-performance APIs and backend services for the company’s electronic commodity trading platforms. No team size or scope is stated.

You will work with Python, FastAPI, TypeScript, Next.js, Azure, MongoDB, Elasticsearch, LLMs, and RAG pipelines. As the second full-stack engineer at a YC-backed healthcare AI startup, you own the product surface, search, analytics, enterprise workflows, and integrations for a platform replacing pharma's manual compliance and consultant processes.

You will build frontend applications with React, TypeScript, JavaScript (ES6+), GraphQL/Apollo, Material UI, and WebSockets. This is for an early-stage company creating a real-time platform for enterprise financial markets, where you will own features alongside product and backend engineers. The team is small and experienced.

You will own a Python data platform for an art-valuation startup, working with GCP, Terraform, LLM batch processing, and data orchestrators. You will build pipelines integrating 30+ web, API, and bulk-data sources, and support a small, distributed ML team.

Lead a team of engineers building open-source workflow orchestration for n8n. This first-line manager role focuses on either the Governance & Observability team (audit logs, admin controls) or the Licence & Billing team (subscriptions, payments, usage tracking). You will work with modern SaaS technologies in a high-growth environment, directly managing engineers.