153,088+ Senior Python Engineer Fastapi Api Performance Jobs in London, UK — Local Employers Hiring June 2026

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Senior Python Engineer FastAPI & API Performance

Barclays in Greater London is seeking a Python Developer to enhance Python web applications and optimize system performance. Responsibilities include delivering robust software solutions, collaborating with cross-functional teams, and ensuring code quality. Ideal candidates should have experience with ...

Senior Python Engineer (Public API & FastAPI)

Senior Python Engineer – Public API Compensation: Competitive + Stock-Options/BSPCE (local currency) Location: Remote with monthly Paris office visits (fully reimbursed). We can hire people already based in selected countries only: France, Germany, Ireland, Italy, Portugal, Spain, UK ...

Senior Python Engineer: Public API with FastAPI (Remote)

Photoroom is seeking a Senior Python Engineer focused on developing our public API. This remote role requires strong experience in backend systems and public API design. You’ll collaborate with cross-functional teams to ensure the API delivers value, while promoting reliability and performance. The pos ...

Senior Software Engineer Python FastAPI

Senior Software Engineer / Developer (Python FastAPI) London / WFH to £120kAre you a Senior Software Engineer with strong Python skills combined with Fintech / financial services experience?You could be progressing your career at a global, Fintech services company that has seen 30-40% yea ...

Senior Backend Engineer — Python, FastAPI & Databricks

Client Server Ltd. is seeking a Backend Software Engineer / Developer with expertise in Python and FastAPI. This role involves designing and developing backend services within a hybrid work model, emphasizing collaboration and strong technical skills. Competitive salary up to £95,000 along with benefit ...

Senior Backend Engineer — Python, FastAPI, Azure

TXP is seeking a Senior Backend Developer specializing in Python and Azure to join their team. This role involves hands-on development of backend services and APIs within a secure enterprise environment, with a focus on delivering reliable software solutions. The ideal candidate should have strong expe ...

Senior Backend Engineer — Python Microservices (FastAPI) London

A leading Insurtech company in London is seeking a motivated Senior Backend Engineer to build and scale their insurance platform. The role focuses on developing Python microservices using FastAPI and collaborating in a high-performing team. The ideal candidate has strong expertise in Python development, microser ...

Senior AI Driven SDLC Engineer (Python/FastAPI)

ClearRoute is seeking a hands-on technical lead in Greater London to deliver production-quality Python/FastAPI services on an agile platform. You will work directly with the chief architect and lead by example, owning contributions from development to production. The ideal candidate has strong experien ...

Senior Python Backend Engineer – Climate Tech (FastAPI)

Victrays is seeking a highly motivated Backend Python Engineer to scale our product and infrastructure. This role involves designing robust backend services and collaborating with engineers to deliver quality customer experiences. The ideal candidate has 4+ years of experience, strong knowledge of Pyth ...

Senior Python Developer FastAPI Start up

Senior Python Developer / Software Engineer (Python FastAPI Django) London to £120k Would you like to progress your career in a senior, hands‑on role at an early stage AI start‑up within the beauty space? As a Senior Python Developer you'll focus on building backend services and FastAPIs ...

Backend Software Engineer Python FastAPI SQL

Backend Software Engineer / Developer (Python FastAPI SQL Databricks) London to £95kAre you a data centric Backend Software Engineer with strong Python, SQL and FastAPI skills?You could be progressing your career in a senior, hands-on role at a fast growing, global Insurance Underwriting ...

Python AI Backend Engineer (FastAPI + Snowflake)

Global is seeking a mid-level AI Engineer specializing in Python for their Global:IQ team in Greater London. This role involves backend engineering to develop scalable systems integral to their new intelligence platform, which harnesses data science and AI methodologies. Successful candidates will requ ...

Backend Software Engineer Python FastAPI SQL

London, Greater London | £85k - £95k per year Backend Software Engineer / Developer (Python FastAPI SQL Databricks) London to £95k Are you a data centric Backend Software Engineer with strong Python, SQL and FastAPI skills? You could be progressing your career in a senior, ...

Senior Python Backend Engineer – FastAPI, AWS, Hybrid (London)

Client Server is seeking a Senior Python Developer/Software Engineer to join their London office in a hands-on role. The successful candidate will build backend services and FastAPIs using Python, as well as integrate LLMs and payment systems. You'll collaborate with a talented team while enjoying flexibility ...

Senior Python Engineer Cloud API & Leadership

A leading consulting firm is seeking a Senior Python Engineer based in Greater London to design and develop scalable software solutions. The role requires strong expertise in Python frameworks and cloud environments, especially AWS, Azure, or GCP. Responsibilities include mentoring staff and leading technical di ...

Senior Python Backend Architect FastAPI, AWS, Postgres

Oliver Bernard is partnering with a high-growth Data Intelligence Platform start-up to hire a Senior Engineer in Central London. The ideal candidate will have strong Python skills and experience in backend development, with a focus on performance and quality. This role requires a minimum of 5 years in ...

Senior Python Backend Architect FastAPI, AWS, Postgres

Oliver Bernard is partnering with a high-growth Data Intelligence Platform start-up to hire a Senior Engineer in Central London. The ideal candidate will have strong Python skills and experience in backend development, with a focus on performance and quality. This role requires a minimum of 5 years in ...

Senior Python & API Systems Integrator

Stars Arena is looking for a Systems Integration Engineer with strong expertise in Python and SQL to join their team in London. The ideal candidate will have over 3 years of experience in system integration across multiple platforms, proficiency in RESTful API development, and familiarity with CI/CD processes. T ...

Senior Software Engineer Python & C# | Semantic API

慨正橡扯 is looking for a Software Engineer III with expertise in Python and C#. In this role, you'll build advanced systems and maintain APIs while ensuring coding best practices. Ideal candidates will have strong knowledge in Agile methodologies, secure coding practices, and experience with data query la ...

Senior Python Backend Engineer — API & AWS (Contract)

Arrows is seeking a Senior Software Engineer with a strong background in Python for a 6-month contract in Greater London. The role requires ownership of backend features and services, with opportunities to work closely with a permanent engineering team. Ideal candidates should excel in fast-paced envir ...

Backend Python Engineer — AI Driven, FastAPI, Hybrid London

Job title: Software Engineer Client: Not specified Salary: £120,000 per annum + Benefits Location: London (Hybrid / Flexible Working) The Role We’re supporting a rapidly growin ...

Python Cloud Engineer – AWS, Terraform, FastAPI | Hybrid UK

A premier technology recruitment agency is seeking an experienced Python Engineer for a contract role in the United Kingdom. This position entails designing cloud-native applications and optimizing CI/CD pipelines using Python, AWS, and Terraform. Candidates should have a proven track record of at least 5 years ...

Senior Backend Engineer Orchestration for Autonomous Tech

Jack & Jill is seeking a Senior Backend Engineer to join their innovative team, aimed at building a orchestration platform for autonomous technology deployment. This role requires significant experience with API design and backend systems, particularly in Python and FastAPI. You will have the opportunity to shap ...

Senior Python ML Engineer for Automation & API Solutions

Orion Innovation is seeking a Senior Python ML Engineer in Greater London to focus on automation and develop a backup application solution. The role involves collaboration with teams to assess system functionality and future improvements. Ideal candidates must demonstrate strong programming skills in P ...

Senior Python & C# Engineer Semantic API & Flexible Hours

Limelight Health is looking for a Software Engineer III with strong Python and C# skills for its Greater London location. In this role, you'll develop and maintain a semantic search API and implement best coding practices while working independently on complex challenges. The ideal candidate will have ...

Senior Full Stack Engineer (Remote) – Python & API Expert

Mercor is seeking a Senior Software Engineer to design and maintain full-stack applications using Python in a remote capacity. This role requires strong proficiency in Python, API development, and experience with MCP systems. The ideal candidate must have multiple years of experience, excellent problem ...

Lead Software Engineer Python API Fintech

Lead Software Engineer / Developer London / WFH to £120kAre you a skilled a backend focused Python technologist with team leadership experience?You could be progressing your career at a well-funded and profitable FinTech start-up.As a Lead Software Engineer you'll head up a small, ...

Hybrid Lead Python Engineer API & Cloud

Client Server Ltd. is seeking a Python Developer / Team Lead based in Greater London to spearhead a talented tech team. The ideal candidate will possess strong Python development skills along with team leadership experience, mentoring others and overseeing projects. Enjoy a competitive salary of up to £120k. Emb ...

Remote Backend SaaS Engineer — Python & API

A leading open source software company is looking for a talented software developer to create new features and improve the Landscape codebase. The role involves remote collaboration with a global team, committing to high-quality code and automated testing, and requires strong proficiency in Python and experience ...

Senior ML Engineer — High Performance Python & HPC

A technology company in the United Kingdom is seeking a Machine Learning Engineer to join their modeling engineering team. The role involves converting trading models into production systems, designing necessary tooling, and supporting strategy research and development. The ideal candidate will have a strong fou ...

ML Focused Python Developer | FastAPI, Cloud & RAG

AWTG Ltd. is seeking a skilled Python Developer based in London to join its team. The role involves developing and maintaining software applications using Python and FastAPI, implementing CI/CD pipelines, and deploying applications on cloud platforms like AWS and GCP. The ideal candidate has over 5 yea ...

Lead Python Developer – Cloud, FastAPI & Data Platforms

Oliver Bernard is seeking a Lead Python Developer for a leading InsurTech company in Central London. The role offers a salary of up to £110k with a bonus and benefits, and involves leading a small Engineering team to address complex challenges while establishing best practices. The successful candidate ...

Senior Backend Engineer — Python APIs, Data, Hybrid

A technology-driven financial services firm in Greater London is seeking a Senior Backend Engineer to enhance their market-leading CLO product. The role involves leading projects, collaborating in cross-functional teams, and improving backend services. Ideal candidates will have substantial Python experience, es ...

Python Senior Developers AI Training Manchester, UK

Overview Prolific is building the biggest pool of quality human data in the world, with over 35,000 AI developers, researchers, and organizations using our platform. Role Senior Python Developer – join our Expert Network to train and evaluate cutting‑edge AI models. Successful c ...

Senior Backend Engineer for DAG‑Driven Orchestration

Jack and Jill AI is seeking a Senior Backend Engineer to design an orchestration layer for deploying autonomous technology in heavy industries. You will build integrations using Python and FastAPI, ensuring platform reliability through CI/CD pipelines. This role offers a chance to directly influence the architec ...

AI Powered Python API & Data Engineer (Energy)

A leading energy tech company in London seeks a Software Engineer/Data Engineer to build data presentation layers and stable APIs for complex energy market data. Responsibilities include full lifecycle ownership of projects, designing infrastructure, and ensuring code quality. The ideal candidate has 4+ years of ...

Backend API Engineer — Python, AWS & Data Pipelines

A leading advertising and communication agency in Greater London is seeking a Software Developer Back End. The role involves designing and operating scalable APIs and data systems on AWS, while leading a team. Ideal candidates should have strong Python and FastAPI skills, along with experience in CI/CD and AWS s ...

Python Software Engineer – API & Cloud Focus (London)

hackajob is looking for a Software Engineer/Python Developer to help design, develop, and improve software that enhances business capabilities. This role involves collaborating with product managers, designers, and engineers to deliver high-quality software solutions. Ideal candidates will demonstrate ...

Senior Python DevOps Engineer for High Performance Trading

A leading trading firm in Greater London is seeking a dynamic software engineer to enhance their quantitative trading teams. The role involves ensuring production servers are configured properly, writing and maintaining python infrastructure, and addressing trading operational issues. Ideal candidates will posse ...

Senior Front End Developer London

Salary: £? - ? per year Requirements Strong commercial experience with React, TypeScript and modern front-end frameworks. Experience with Next.js and building complex, API-driven user interfaces. Strong understanding of performance optimisation, accessibi ...

Senior API Platform Engineer

LexisNexis Risk Solutions is seeking a Software Engineer III in London to design, build, and support API platforms that provide high-quality solutions for internal and external users. The role emphasizes delivering reliable systems and improving developer experiences while utilizing various programming ...

Senior Python Engineer

Hungry for a challenge?Our mission? To empower every food moment around the world, whether it’s through customer service, coding or couriers.The opportunity:A Senior Engineer opportunity within our Enterprise AI team. Working with a group of ...

Senior Python Engineer

Senior Python Engineer Department: Global Security Services Employment Type: Permanent - Full Time Location: UK - London Description Working within our Cyber Data Services team, which is at the core of our Proactive Insurance product offer ...

Senior Python Engineer

Senior Python Engineer Key Responsibilities Design, develop, and maintain scalable and reliable software solutions, ensuring alignment with Principals and Architects. Collaborate with cross-functional teams, including Product, QA, and DevOps, to deliver high-quality feat ...

Senior Python Engineer

Senior Python Engineer – Data Platforms Leading FinTech | Hybrid (London) Full-Time | Competitive Salary + Bonus + Benefits Join a fast-growing FinTech helping global financial institutions unlock more value from complex data. Working with major banks, asset managers, and trading firms, the ...

Senior Python Engineer

Tickerface is building the world's first shoppable content monetization platform. We believe shopping should be a fun and interactive experience. Our product lets content publishers enable their audience to buy products from any retailer without losing their attention. Content no longer needs to be ...

Senior Python Engineer

We are a leading global online food delivery marketplace. Our tech ecosystem connects millions of active customers with hundreds of thousands of connected partners in countries across the globe. The Opportunity A Senior Engineer opportunity within our Enterprise AI team. Working with a gr ...

Senior Python Engineer

Senior Python Engineer – AI & Intelligent Systems Location: London (Hybrid) Overview The Opportunity: Our client is seeking an experienced Senior Python Engineer to help build the next generation of AI-enabled products and platforms within a highly complex, data-rich environment. T ...

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