Backend Developer Python Fastapi - 137+ job offers

Jobgether

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Python Backend Developer (Django/FastAPI) in United Kingdom. This is a high-impact backend engineering role focused on building and scaling Python-based systems that power a modern, AI-augmente

Job Title: Python Backend Developer Job Type: Contract Job Location: London , UK Job Description Python Backend Developer: We need a senior developer with extensive knowledge on building scalable python back-ended solution. For example, how to support dozens of concurrent requests, how to handle occ

9nexus

Role Overview We are looking for a skilled Python FastAPI Developer to design, develop, and maintain scalable backend services and APIs. The ideal candidate will have strong expertise in Python development, FastAPI frameworks, and API integrations. Experience with frontend/UI development is a plus.

Mustard Systems

Description At Mustard Systems, we leverage statistical modeling to dive into sports events and help us make informed predictions about future outcomes. By utilising our unique datasets, advanced statistical models, and custom-built software, we strive to accurately forecast sports results. We value

Client Server

£6,667 - £7,917 /month

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, hands-on role at a fast growing, global Insurance Underwriting technolog

Women in Tech

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, hands-on role at a fast growing, global Insurance Underwriting technolog

Haystack

We are partnering with a global organization at the forefront of defense and security innovation, offering cutting-edge solutions to protect nations. This company leverages advanced technology to deliver critical communication and intelligence platforms, ensuring stability and safety on a global sca

Client Server

£5,000 - £6,250 /month

Python Developer / Software Engineer / Developer Remote UK to £75k Are you a backend focused Python Developer? You could be progressing your career in as a hands-on Python Developer role as part of a friendly and supportive international team at a growing and hugely successful European car insurance

Advanced Resource Managers

Senior Backend Python Developer 6-Month contract – Inside IR35 – up to £450 per day Leeds based – hybrid working – 3 days onsite Responsibilities Build and maintain backend services and APIs in line with existing architectural patterns and standards. Implement business logic, data access layers, and

iO Associates

Senior Python Backend Developer - API Design (Fully remote Part-time contract) Rate: £325 - £350 p/d (Outside IR35) Duration: 15 June 2026 till end of December 2026 Workload: 110 days billable allowance (To be allocated during contract period) Location: 100% Fully Remote (Cloud-based collaboration p

Advanced Resource Managers Limited

Senior Backend Python Developer 6-Month contract - Inside IR35 - up to £450 per day Leeds based - hybrid working - 3 days onsite Responsibilities Build and maintain backend services and APIs in line with existing architectural patterns and standards. Implement business logic, data access layers, and

iO Associates

Role: Senior Python Backend Developer (Part-time) Rate: £300 p/d Outside IR35 Duration: June 2026 until 7th August 2026 Workload: 30 days billable allowance (To be allocated across the contract period Location: 100% Fully Remote (Cloud-based collaboration platform) Eligibility: UK-based candidates p

Turing

About Us: Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, ad

Turing

About Us: Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, ad

Turing

About Us: Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, ad

Turing

About Us: Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems. Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, ad

ARM

Senior Backend Python Developer 6-Month contract - Inside IR35 - up to £450 per day Leeds based - hybrid working - 3 days onsite Responsibilities Build and maintain backend services and APIs in line with existing architectural patterns and standards. Implement business logic, data access layers, and

Airswift

Job Title: Back End Engineer (Sitecore / .NET) Duration: Contract, start of June - End of 2026 Workload: Full time hours Setup: Freelance (Daily rate / Limited Company / Umbrella / Sole Trader) Location: UK (Hybrid / Remote) We need an experienced Back End Engineer to design, build, and maintain sec

Mentor Talent Acquisition

We’re building LLM-powered workflow tools to support investment research for private market investors, used by leading private equity and consulting firms globally. This is a high-ownership backend engineering role focused on building and scaling systems that power an AI-driven research platform. Yo

Searchability®

Searchability are partnered with a well-funded Series A startup building one of the most exciting collaborative canvas / whiteboard developer platforms in Europe. Their product enables companies to build rich multiplayer drawing, diagramming and infinite canvas experiences directly into their own ap