351 to 375 of 443 FastAPI Jobs in the UK

Senior Backend Engineer

Location
Greater London, England, United Kingdom
ensure OneSuite’s backend systems are scalable, reliable, secure, and performant. Responsibilities Backend Architecture & System Design Architect distributed backend services and APIs using Python, FastAPI, Node.js, or equivalent frameworks. Design modular, observable, and scalable backend components for orchestration, data services, and platform integrations. Define patterns for microservices, domain boundaries, caching … decisions across charters to ensure consistency and maintainability. Qualifications Demonstrable backend engineering experience, with architectural ownership over services or distributed systems. Expertise in Python, FastAPI, Flask, or Node.js and modern backend development patterns. Strong understanding of microservices, concurrency, async programming, and event‐driven architectures. Proficiency with SQL and NoSQL databases ...

Senior Backend Engineer

Hiring Organisation
Publicis Media
Location
London, United Kingdom
Salary
£ 70 K
multiple charters to ensure OneSuite’s backend systems are scalable, reliable, secure, and performant.ResponsibilitiesBackend Architecture & System DesignArchitect distributed backend services and APIs using Python, FastAPI, Node.js, or equivalent frameworks.Design modular, observable, and scalable backend components for orchestration, data services, and platform integrations.Define patterns for microservices, domain boundaries, caching, queuing, resiliency … backend capabilities.Align architecture decisions across charters to ensure consistency and maintainability.QualificationsDemonstrable backend engineering experience, with architectural ownership over services or distributed systems.Expertise in Python, FastAPI, Flask, or Node.js and modern backend development patterns.Strong understanding of microservices, concurrency, async programming, and event-driven architectures.Proficiency with SQL and NoSQL databases (PostgreSQL, DynamoDB ...

Senior Software Engineer

Location
Greater London, England, United Kingdom
Software Engineer on the POS team, you'll work directly across the core POS codebase: the React Native and Expo application, the Python and FastAPI backend service, the Terraform infrastructure, and the Argo CD and Helm deployment configuration. You'll design, build, deploy, and operate the next generation of Cloudbeds … using SQLite, write-ahead logging, synchronization, retry, and conflict‐handling patterns so properties can continue operating during connectivity issues Build and operate Python/FastAPI backend services that support authentication, staff and device workflows, menus, orders, payments, receipts, and hotel‐system integrations Design reliable APIs, data models, caching, synchronization ...

Senior Python Data Modelling Specialist – Hybrid (Glasgow)

Location
Glasgow, Scotland, United Kingdom
blends Python development, data modelling and governance to support enterprise data, risk and regulatory needs. You will design scalable data models, work with Pydantic, FastAPI, Collibra and REST APIs, and contribute to data quality, lineage and metadata management while collaborating with stakeholders across #J-18808-Ljbffr ...

Senior Backend Engineer — Scalable APIs & Systems

Location
Greater London, England, United Kingdom
write production-grade code, solve distributed systems challenges, and collaborate with cross-functional teams. The ideal candidate has expertise in Python and frameworks like FastAPI or Node.js, as well as CI/CD experience. This role supports hybrid working, offering excellent benefits including wellness days and flexible working arrangements. #J ...

Senior Data Platform Engineer - AWS & Databricks

Location
Greater London, England, United Kingdom
will upskill data-literate backend engineers, act as the team's data expert, and drive scalable, reusable data pipelines and APIs using Django/FastAPI where appropriate. You'll maintain and evolve the data warehouse with Databricks, champion DataOps practices, and ensure robust, globally scalable data applications across #J ...

Senior POS Engineer - Remote (Europe)

Location
York and North Yorkshire, England, United Kingdom
seeking a Senior Software Engineer for our POS team. You will work across the core POS stack including React Native, Expo, Python/FastAPI backend, Terraform infra, Argo CD and Helm deployment configurations. You will own end-to-end delivery, from code to production reliability, on a completely remote team ...

Senior Backend Engineer - API-Driven Finance Platform

Location
Greater London, England, United Kingdom
Backend Developer to lead technical projects and enhance its web applications. This role requires strong expertise in Python, experience with frameworks like Flask and FastAPI, and the ability to deliver APIs effectively. The ideal candidate will collaborate with various teams, mentor junior staff, and contribute to the automation and improvement ...

Engineering Team Lead (AI Focused)

Location
Greater London, England, United Kingdom
Virtual Personas Delivery of the Product roadmap Managing a team consisting of a range of skillsets and experience Full stack development, across Python/FastAPI services and React/TypeScript front ends Continuously improving the team's processes for iterative development, including embedding automated testing and CI quality gates into … encouraging our developers Conducting regular 121's, setting objectives and assisting with tailored development plans Our engineering environment includes technologies such as Python (FastAPI), LangChain/LangGraph for multi-agent LLM orchestration, React/TypeScript, PostgreSQL, MongoDB, Redis, Azure (App Service, Container Registry, Blob Storage), Docker, GitHub Actions, and modern ...

Engineering Team Lead | Tech | London, UK

Location
City of Westminster, England, United Kingdom
Virtual Personas Delivery of the Product roadmap Managing a team consisting of a range of skillsets and experience Full stack development, across Python/FastAPI services and React/TypeScript front ends Continuously improving the team's processes for iterative development, including embedding automated testing and CI quality gates into … encouraging our developers Conducting regular 121's, setting objectives and assisting with tailored development plans Our engineering environment includes technologies such as Python (FastAPI), LangChain/LangGraph for multi-agent LLM orchestration, React/TypeScript, PostgreSQL, MongoDB, Redis, Azure (App Service, Container Registry, Blob Storage), Docker, GitHub Actions, and modern ...

AI Engineer

Hiring Organisation
IFS
Location
London, United Kingdom
Salary
£ 80 K
state machines to validate logic)Fullstack Product EngineeringBuild end‐to‐end product features spanning:Backend services (Python/TypeScript)APIs (REST/GraphQL/FastAPI)Frontend experiences (React)Create human‐in‐the‐loop interfaces for AI systems (review, override, explainability)Collaborate closely with Product and Design to ship usable, explainable … heavy domainsBackground in data engineering or ML platformsExperience building developer tools or internal platformsExposure to regulated or security‐conscious environmentsTech StackBackend: Python (Django/FastAPI), TypeScript (Node.js)Frontend: ReactAI: LLMs, RAG pipelines, agent frameworksInfra: Cloud (AWS/GCP), Docker, CI/CD, IaCData: SQL, event‐driven systems, analytics pipelinesAdditional InformationWe ...

Lead AI Software Engineer

Hiring Organisation
Wells Fargo
Location
London, United Kingdom
Salary
£ 80 K
enterprise UI standards and reusable component patterns. Build and maintain Python backend services, APIs, MCP services, and integration layers using frameworks such as MCP, FastAPI & Flask. Design, implement, and integrate with MCP servers and MCP clients that enable secure context sharing between models, tools, applications, and agent runtimes. Develop … combination of the following: work experience, training, military experience, educationStrong proficiency in Python with experience building services using frameworks such as Fast MCP, FastAPI & Flask. Experience developing and integrating with REST APIs, asynchronous services, and event-driven architectures. Experience integrating with AI, LLM-based systems, agent platforms, or AI APIs. ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
Belfast, Down, United Kingdom
Salary
£ 60 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
Manchester, Greater Manchester, United Kingdom
Salary
£ 70 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
Edinburgh, Midlothian, United Kingdom
Salary
£ 70 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
London, United Kingdom
Salary
£ 80 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
Newcastle Upon Tyne, Tyne and Wear, United Kingdom
Salary
£ 60 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

Senior Fullstack Developer

Hiring Organisation
Version 1
Location
Birmingham, West Midlands (County), United Kingdom
Salary
£ 70 K
Company DescriptionVersion 1 has celebrated over 29 years in Technology Services and continues to be trusted by global brands to deliver solutions that drive customer success. Our expertise enables our customers to navigate the rapidly ...

AI‐Powered Systems Integrator: Data Tools for Fund Management

Location
Greater London, England, United Kingdom
environment, building data products and AI-enabled workflows for fund management and finance teams. You will design and ship internal tools using Python, Streamlit, FastAPI and related tech, while reusing existing capability from OE Group's data platform. The role blends integration and product development in a small team. #J ...

Frontline Healthcare AI Engineer (Customer-Facing)

Location
England, United Kingdom
engineering to understand real-world problems and translate them into production-ready software. You’ll build end-to-end features with Python/FastAPI and React, collaborate with healthcare customers, and own problems from initial conversations through deployment. Expect a hands-on role with real impact. #J-18808-Ljbffr ...

Senior Backend Engineer — Build Scalable FinTech Platforms

Location
Greater London, England, United Kingdom
team building scalable systems that power the product for millions of customers. You'll work with Kotlin with Spring Boot and Python with FastAPI, contribute across the full product lifecycle, and mentor colleagues while solving real-world problems in a hybrid London/Athens/Cyprus setup. Expect a fast ...

Senior Backend Engineer

Location
Greater London, England, United Kingdom
routing engine, billing infrastructure and webhook delivery. Python/FastAPI/MongoDB. We process every inbound lead through code you write — sub-100ms p99 latency, idempotent everything, audit-trail everything. Who you are 6+ years building production Python services — async/await fluent Deep MongoDB experience including indexing, aggregation, transactions ...

Full Stack Developer Python-React

Location
City of Edinburgh, Scotland, United Kingdom
technical stakeholders to integrate AI models into scalable, production-grade systems. The position can suit a strong Full Stack profile or a specialised Backend (FastAPI/Python) or Frontend (React/TypeScript) developer. Responsibilities Design and develop resilient web applications with AI integration Translate business and product requirements into technical … Ensure high code quality through reviews, testing and best practices Support deployments and contribute to Agile delivery Required skills Strong experience in Python with FastAPI Solid experience in React and TypeScript Good knowledge of PostgreSQL Experience integrating AI/ML models into applications Git, CI/CD and Agile (Scrum ...

Azure AI Developer

Location
Reading, England, United Kingdom
Designing and developing production-grade AI-powered applications. Building modern full-stack solutions using technologies such as React, Node.js, .NET/C#, Python and FastAPI . Integrating Microsoft AI technologies including Azure OpenAI, Azure AI Foundry, Foundry Agents and Azure AI Search . Building LLM-powered applications, RAG architectures, agentic … exposure to generative AI. Ideally, you’ll have: Extensive commercial full-stack development experience with one or more of: React/Node.js Python/FastAPI A strong track record of delivering production-grade software , not just prototypes. Experience designing and deploying applications within Microsoft Azure . Hands-on experience integrating ...

Global AI/ML Engineer Manager

Hiring Organisation
The Boston Consulting Group
Location
London, United Kingdom
Salary
£ 100 K
experimentation, and curiosity.Technical ExcellenceChampion engineering excellence, clean architecture, and maintainable code across squads.Hands-on in backend development – leading complex problem-solving in Python (especially FastAPI).Architect and support secure, scalable, and stable APIs and services that integrate with LLMs and modern cloud platforms (AWS).Promote DevOps practices, CI/… making strategic trade-offs.What You'll Bring7+ years of hands-on software engineering experience with strong backend/API expertise using Python (FastAPI or Flask).1+ years of hands-on experience with LLMs: building RAG solutions, agentic workflows, integrating LLMs (e.g., OpenAI, Gemini, Anthropic, etc.) into products, building and integrating ...