Backend Developer Python Fastapi jobs in London

IDAM Back-end Java Developer - SC Cleared | £500 - £535 We're working with a global tech powerhouse delivering mission-critical digital transformation for the UK public sector on this exciting opportunity. We are seeking a high-caliber Senior Java Developer with deep IDAM expertise to spearhead a ma

Mid/Senior Back End Developer, Golang | Social Media, Scale-Up, 18 Million Users | Salary Up to £85,000 + Benefits & Bonus (EU/UK Remote) We’re seeking a talented Back-End Developer with strong experience in Golang to join a fast-growing social media mobile application, withover 18 million downl

Contract Job Title: Back End Developer, Engineering, Defense & Security (DV clearance required) **Contract Start Date: March 2026 ****Contract Length: 12 months, with potential extension **Contract Classification: Inside IR25 ****Contract Location: London, Bristol or Manchester with hybrid worki

Senior Software Engineer Location: London (x3 days a week onsite) Salary: Up to £100k DOE Type: Perm Job Description We are looking for a passionate Senior Back-End Java Engineer in London to lead the design and development of core product features and services that power an app used by thousands of

Mid/Senior Back End Developer, Golang | Social Media, Scale-Up, 18 Million Users | Salary Up to £85,000 + Benefits & Bonus (EU/UK Remote) We’re seeking a talented Back-End Developer with strong experience in Golang to join a fast-growing social media mobile application, withover 18 million downl

IDAM Back-end Java Developer - SC Cleared | £500 - £535 We're working with a global tech powerhouse delivering mission-critical digital transformation for the UK public sector on this exciting opportunity. We are seeking a high-caliber Senior Java Developer with deep IDAM expertise to spearhead a ma

If you need support in completing the application or if you require a different format of this document, please get in touch with at UKI.recruitment@tcs.com or call TCS London Office number 02031552100 with the subject line: “Application Support Request”. Role: Java Backend Engineer Job Type: Perman

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

InfoSec People Ltd

From £80,000 /year

Title: Node.js Backend Developer Salary: up to £80,000 + share options Fully remote (UK) Cybersecurity SaaS js Backend Developer to own production APIs and serverless microservices. You’ll work with senior engineers to design, build and operate secure, reliable services that protect users in real ti

InfoSec People Ltd

From £80,000 /year

Title: Node.js Backend Developer Salary: up to £80,000 + share options Fully remote (UK) Cybersecurity SaaS js Backend Developer to own production APIs and serverless microservices. You’ll work with senior engineers to design, build and operate secure, reliable services that protect users in real ti

Qodea Limited

A global technology company is seeking a Senior AI Engineer in Greater London. This role involves backend development, utilizing Python and FastAPI to design and maintain APIs. You will work on distributed systems and integrate AI components while ensuring performance and scalability. The position o

Haystack

*IDAM Back-end Java Developer - SC Cleared | £500 - £535** We're working with a global tech powerhouse delivering mission-critical digital transformation for the UK public sector on this exciting opportunity. We are seeking a high-caliber Senior Java Developer with deep IDAM expertise to spearhead a

Client Server

Backend Software Engineer / Developer (Python FastAPI SQL IaC) 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 technology provid

Syncoms

Job Description What’s in it for you? Within a year of working with us, you will be entrepreneurial, confident in your area of expertise, be amongst the top of your game and the envy of your peers. Many of our colleagues have moved onto exceptional leadership positions leading innovative tech projec

Jack & Jill

A leading software company in London is seeking a Senior Software Engineer to own backend architecture and build production-ready Python systems for the Athena platform. You'll enjoy product ownership in a collaborative startup environment, contributing to impactful solutions in workforce management

KodeLab

Job Description Power the Core of Fintech Innovation: Senior Back-End Developer at Kodelab At Kodelab, we are shaping the future of fintech, blockchain, and AI-powered solutions. Our back-end infrastructure is the backbone of our success, powering everything from secure financial transactions to AI-

KodeLab

Job Description Power the Core of Fintech Innovation: Senior Back-End Developer at Kodelab At Kodelab, we are shaping the future of fintech, blockchain, and AI-powered solutions. Our back-end infrastructure is the backbone of our success, powering everything from secure financial transactions to AI-

KodeLab

Power the Core of Fintech Innovation: Senior Back-End Developer at Kodelab Make sure to apply quickly in order to maximise your chances of being considered for an interview Read the complete job description below. At Kodelab, we are shaping the future of fintech, blockchain, and AI-powered solutions

KodeLab

Power the Core of Fintech Innovation: Senior Back-End Developer at Kodelab At Kodelab, we are shaping the future of fintech, blockchain, and AI-powered solutions. Our back-end infrastructure is the backbone of our success, powering everything from secure financial transactions to AI-driven platforms

KodeLab

Power the Core of Fintech Innovation: Senior Back-End Developer at Kodelab At Kodelab, we are shaping the future of fintech, blockchain, and AI-powered solutions. Our back-end infrastructure is the backbone of our success, powering everything from secure financial transactions to AI-driven platforms