86,467+ Fullstack Developer Reactpythonnet Cloud Apis Jobs in UK — Top Companies Hiring June 2026

Professional job seekers finding United Kingdom jobs through Expertini
750,000+ professionals on Expertini 750,000+ Candidates
Join our global community
Expertini Penguin Mascot Resume Score™
Resume Score™ Instantly
Upload Your CV
Quick 30-second process

Apply Today & Jumpstart Your Career on Expertini, Trusted Since 2008.

Reset

Create Job Alert

 
   
Reset

Senior Node.js/TypeScript Engineer – Build Scalable FinTech APIs

A leading embedded investment platform in the UK is looking for a Senior Software Engineer to design, build, and operate reliable software solutions using Node.js and Typescript. You'll work collaboratively in cross-functional teams and own your services end-to-end. The ideal candidate has experience with AWS an ...

Senior Backend Engineer Data Platform & APIs (Hybrid UK)

Gravitas Group is seeking a Senior Software Engineer to enhance our client's data platform in Sunbury-on-Thames. The role focuses on backend systems using TypeScript, Node.js, and AWS, offering the chance to tackle complex data challenges and mentor a small team. The ideal candidate will have strong ex ...

Senior .NET Backend Engineer — APIs, C#, SQL (UK)

A leading tech company in the UK is looking for a Senior .NET Developer to design, develop, and maintain robust software applications. This role involves close collaboration with cross-functional teams to translate user needs into effective technical solutions. Key technical skills required include proficiency i ...

Neurosymbolic AI Platform Engineer to Scale Public APIs

UnlikelyAI, based in London, seeks a Senior Software Engineer to join their team focused on building a unique neurosymbolic AI platform. In this role, you'll design and build the infrastructure for a new public API, develop symbolic reasoning engines, and scale document ingestion pipelines. The ideal candidate h ...

Senior Software Engineer — Hybrid, Build Secure APIs & Apps

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security ...

Full Stack Software Engineer Build Scalable SaaS & APIs

PTC Inc. is seeking a Full Stack Software Engineer in Cambridge, UK, to design and build high-quality scalable software solutions. The ideal candidate will have a minimum of 3 years in software development and experience with TypeScript, Node.js, and Angular. You’ll work closely with cross-functional teams to ...

Senior Python Backend Engineer — Scalable APIs & AI Workflows

A dynamic scale-up in the fintech space is looking for a Senior Python Developer to join their team in Greater London. In this role, you'll implement robust solutions, design REST APIs, and ensure code quality through testing and reviews. The company offers a competitive salary between £70,000 and £95,000, hybri ...

Full Stack Web Engineer: PHP + Modern Frontend & APIs

Experience and skills we need You will have hands‑on experience with HTML 5, CSS and CSS precompilers, JavaScript & TypeScript and other modern web development core technologies. You will have worked with PHP 8 & PHP Frameworks such as Symfony, Laravel, CakePHP or Slim. It would be desirable for ...

Go Backend Engineer Scale APIs & Data (Hybrid, London)

Muzz, located in Greater London, offers a hybrid backend development role focused on Golang and cloud technologies. Ideal candidates will have over 3 years of experience addressing complex backend challenges, with strong database skills in MySQL, DynamoDB, Elasticsearch, and Redis. Your responsibilities will inc ...

Senior JavaScript Engineer: AI Powered APIs, Node/TypeScript

Senior JavaScript Engineer (up to £76,000 per annum) 6 month fixed term contract At Immediate, we’re home to some of the biggest and most loved consumer brands in the UK, including Radio Times, Good Food and Gardeners World. Our trusted, quality content rea ...

Remote Android Engineer: Kotlin, Payments & Real Time APIs

SR2 | Socially Responsible Recruitment | Certified B Corporation™ is looking for an Android Engineer based in Bath, UK. The role focuses on building high-quality mobile features with Kotlin in a mission-driven environment. Key responsibilities include improving legacy code, collaborating on API integrations, and ...

Lead Test Engineering Manager – Automation for SaaS & APIs

A niche financial services provider seeks a skilled Test Engineering Manager to lead their newly formed engineering team. This critical role is responsible for the entire test automation suite and implementing a quality-first culture throughout the organization. Candidates should possess substantial experience i ...

Backend Engineer III (Java & Spring) for Scalable APIs

LexisNexis Risk Solutions in Oxford is looking for a Software Engineer III specializing in Java and Spring Boot. This role involves designing and improving services for document transformation and semantic enrichment, working in a collaborative environment with technologies like AWS and Kafka. The company promot ...

Senior Backend Engineer C#/NET, SQL Server, APIs

A leading tech recruitment firm is seeking a Senior Back-End Developer in Manchester to enhance their capabilities in delivering SaaS products. Responsibilities include contributing to the full development lifecycle and utilizing expertise in C#, .NET, and SQL Server. Join a friendly, forward-thinking team that ...

Backend Engineer III (Java/Spring) Scale APIs & AWS

RELX is seeking a Software Engineer III in Oxford to enhance its document transformation and semantic enrichment workflows. The role focuses on building reliable backend services using Java, Spring Boot, and AWS. Candidates should have robust experience in backend development, testing practices like TDD, and wor ...

Senior Full Stack Engineer: Build Scalable SaaS & APIs

Parametric Technology (UK) Limited is seeking a Full Stack Software Engineer to design and maintain high-quality software solutions that support innovative industrial platforms. You will collaborate with cross-functional teams and contribute to architectural decisions. The ideal candidate has over 5 ye ...

Senior Backend Web Engineer for Game APIs & Tools

A leading game development company seeks an experienced Back-end Online Developer to build and support internal and external web APIs for their game engine team. This back-end role emphasizes JavaScript expertise, distributed API experience, and collaborating across teams to improve systems. The position allows ...

Backend Java SDE II — Scale APIs, Hybrid Work

Tesco Technology in Greater London is seeking a Software Development Engineer II to enhance our backend API systems. You'll design and develop high-performance APIs to improve customer experience. With a knowledge of Java, you'll work closely with senior engineers, participate in team planning, and learn modern ...

Senior .NET Backend Engineer Azure, APIs & CI/CD

A leading consultancy in the UK is seeking a Senior .NET Developer to enhance critical backend applications. The role requires 10+ years of experience in C# / .NET Core and strong Azure expertise. Responsibilities include developing complex backend systems, supporting RESTful APIs, and managing CI/CD pipelines. ...

Backend Engineer – Scalable APIs for 3D Viz (Hybrid)

A leading tech firm in the UK is looking for a Back End Developer to strengthen its engineering team. This role involves building and maintaining the backend services for a visualization platform, ensuring data flows efficiently in a complex ecosystem. Candidates should be passionate about server-side logic and ...

Full Stack Engineer: Angular UI & High Performance APIs

Java Script Works in London is seeking a Full Stack Software Engineer to contribute to rendering performance and API response times. You will design and build reusable UI components using Angular and TypeScript, while helping to maintain high-performance backend systems. This full-time role offers a co ...

Backend Engineer Django APIs powering AI dental tech

A leading technology company in Leeds is seeking a Backend Engineer to build reliable APIs and services for dental technology. The ideal candidate has strong experience in Django, solid understanding of database management, and can write maintainable code. This full-time, office-based position offers a salary of ...

Back end Engineer: Build Scalable Web Apps & APIs

Business d’Or LLC. is seeking an experienced Back-end developer to join our IT team in Greater London. This role requires expertise in server-side applications and a passion for creating new software while enhancing existing solutions. The ideal candidate will work closely with developers to maintain s ...

Product Owner: Agile Delivery for Energy AI & APIs

A forward-thinking energy solutions company in London is looking for a Product Owner to oversee its product portfolio. The ideal candidate will have 4-5 years of experience in Agile roles, a strong understanding of Agile methodologies, and excellent communication skills. In this hybrid position, you will transla ...

Senior Integrations Engineer — Build the Telecom OS & APIs

Gigs is looking for a Senior Software Engineer, Integrations in Greater London. This role emphasizes backend expertise and system integration, aiming to create seamless telecom solutions. Ideal candidates will demonstrate strong API design skills, effective communication, and a collaborative mindset. O ...

Frontend Engineer – React, APIs & Large Scale Web Apps

Proxime Limited in Greater London is looking for an experienced Front End Software Developer to join their core platform development team. You will lead efforts to build public websites, private APIs, and back office systems, collaborating closely with the Architecture team on design and implementation. < ...

Remote Java Engineer – FIX APIs for Trading Platform

IG KnowHow is seeking a Java Engineer to join the IG Prime division. You will develop and maintain high-performance FIX APIs to facilitate institutional trading while ensuring reliability and resilience. The ideal candidate will have around 5 years of Java development experience, strong skills in async ...

Senior Go Architect Real Time FinTech APIs (Equity)

Jack & Jill in London is seeking a Senior Product Engineer to lead the architecture and delivery of high-performance Go microservices on AWS. This role offers the opportunity to build the core infrastructure for the UK's first real-time credit bureau, backed by £4m in funding. The ideal candidate has o ...

Backend Engineer (Python) – Build Core APIs & Data (Hybrid)

Skin + Me is seeking a Backend Engineer to strengthen their team in London. You'll focus on backend system services using Python and Flask, developing APIs for consultations and prescriptions. Join a small, skilled engineering team working in a hybrid setting, with three office days in Paddington. Enjo ...

Senior .NET Engineer — Scalable APIs & Event Driven Systems

NewDay is seeking a Senior Software Engineer to design and deliver high-quality C#/.NET applications, create robust APIs, and contribute to our event-driven architectures. This role involves collaborating with an agile team to take solutions from code to production, helping evolve the Stratus platform for bet ...

Remote Full Stack Engineer: TS/Node & AWS APIs

Adria Solutions Ltd. is seeking a Backend-Focused Full Stack Developer to join our growing engineering team in Gainsborough. This mid-level role focuses on enhancing existing systems and contributing to a new platform, offering a chance to tackle complex challenges while improving reliability and performance. ...

Hybrid Technical Systems Analyst APIs, SQL & Data Flows

A leading Digital Challenger in financial services is seeking a Technical Systems Analyst to join their Change team. This role involves gathering business requirements, developing data flows, and ensuring alignment with business objectives. The ideal candidate possesses strong communication skills, technical pro ...

Hybrid Software Engineer — Build Scalable Museum Tech APIs

The National History Museum is seeking a Software Engineer to join their team, responsible for building services that enhance both public-facing digital experiences and core business systems like ticketing and payments. This position offers the chance to work on impactful projects that affect millions of visi ...

Backend Product Engineer: Scale APIs & AI Infra (London)

A dynamic technology startup in London is looking for a Product Engineer focused on the Backend. This role involves scaling and evolving backend infrastructure, designing APIs, and implementing AI capabilities. The ideal candidate has strong skills in TypeScript and Node.js, alongside experience with AWS and rel ...

Front Office Python Engineer: Trading Tools & APIs (Hybrid)

EDF Trading, located in Greater London, is seeking a skilled IT professional to enhance the tools of the Optimisation and Trading Analytical Team. The role emphasizes collaboration with traders to implement features and support post-deployment changes. The ideal candidate will have strong Python skills ...

Senior PHP Engineer — Scale Next Gen Fintech APIs

hackajob is looking for a Senior PHP Engineer to join their dynamic team in Greater London. In this role, you will be pivotal in developing and optimising innovative lending platforms, contributing to architectural discussions and exciting API projects. The ideal candidate should have strong modern PHP ...

Full Stack Product Engineer: Ship High Impact APIs

Niulix seeks a skilled full-stack engineer to develop and maintain innovative applications. The ideal candidate will have experience with both frontend and backend technologies, particularly TypeScript, React, Node.js, and some Rust. Knowledge of cloud services like Azure or AWS/GCP, and containerizati ...

Senior Full Stack Engineer: Build Scalable APIs & Services

Causaly, located in Greater London, is looking for a Senior Fullstack Engineer to join their team. This position involves designing and building scalable, reliable web applications, and collaborating with product and research teams to develop new features. The ideal candidate will have a Bachelor's deg ...

Senior Full Stack Engineer — Shape Scalable Systems & APIs

Enso Recruitment is seeking a Senior Full Stack Software Engineer to join a high-growth startup in Belfast. This role offers the chance to shape and evolve scalable platforms, contributing directly to the design and delivery of high-performance backend systems. The ideal candidate will have over 5 year ...

Remote Senior PHP/Laravel Engineer for Scalable APIs

hedgehog lab is looking for a Senior PHP/Laravel Engineer to join their team in Newcastle upon Tyne. You will work on a leading procurement platform connecting construction projects with suppliers, focusing on real feature delivery and scalable solutions. The role involves active engineering, using age ...

Senior .NET Engineer: APIs, Event Driven & Scalable Systems

United States Digital Space LLC in Greater London is seeking a Senior Software Engineer to design and deliver high-quality C#/.NET applications within an agile team. The role involves hands-on programming, collaborating on platform capabilities, and ensuring high-quality code through CI/CD practices. T ...

Remote Backend QA Engineer: Build Reliable APIs & DBs

Air Ltd is seeking a dedicated Backend QA Engineer to ensure the reliability and performance of our backend systems. In this role, you'll test APIs, databases, and collaborate with engineering teams to uphold quality standards. With approximately 2-3 years of experience in backend technologies like Node.js an ...

Senior Full Stack Engineer (Remote) Scalable APIs & UI

A leading recruitment agency is seeking a Senior Full Stack Engineer for a 12-month remote contract. The ideal candidate has at least 4 years of experience in Python and Flask, along with a strong grasp of SQL databases. Responsibilities include architecting backend services and building responsive front-end int ...

Senior Software Engineer — Hybrid, Build Secure APIs & Apps

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security ...

Senior Software Engineer: C#/.NET, Python & REST APIs

3761 Barclays - BX - UK is seeking a software engineer to design and develop high-quality software solutions. The role demands expertise in C# (.NET/.NET Core), Python, and SQL, focusing on building scalable solutions that drive efficiency and meet business needs. The ideal candidate possesses strong a ...

Senior Backend Python Engineer Data Driven APIs (Hybrid)

Experian is seeking a Backend Senior Software Engineer to design, build, and operate backend systems. You will own the Software Development Lifecycle and collaborate with various teams. This hybrid role offers a great compensation package, including a discretionary bonus and benefits like 25 days annual leave ...

Developer Experience Engineer

About Fractile Fractile is building silicon, systems, and software that redefine the frontier of AI — running the world’s largest language models at radically higher speed and lower cost. Founded in 2022, our 100+ person team spans hardware and software, and we’re growing fast. Locatio ...

Bi Developer

Join to apply for the Bi Developer role at TieTalent Join to apply for the Bi Developer role at TieTalent Business Intelligence (BI) Developer – (BI, Business Intelligence, Qlik, Qlikview, Qlik Cloud, Reporting, Data Warehou ...

🚀 Boost Your Hiring Chances with Our AI-Powered Tool-Kit

Stand out from thousands of applicants. Use our proven career tools to optimize your applications and land your dream job faster.

To-Do Planner

Organize your job search and personal tasks. All data is confidential.

Open Planner

Wellbeing Center

Access your confidential wellness report and resources to manage job search stress.

Check Wellbeing

Skill Coach

Plan your skill development with O*NET support to stay competitive in your field.

Start Coaching

Outfit Helper

Get AI-powered suggestions on what to wear for your next interview.

Find Outfit

Income Tax Calculator

Plan your finances with our calculator, updated for 2025 tax regulations.

Calculate Tax

Salary Benchmark

Get accurate, AI-supported salary trends to know your worth and negotiate better.

Check Salaries

Interview Practice

Practice for any interview with AI-enabled Q&A sessions. All data is private.

Start Practicing

Interview Predictor

Use our AI-supported tool to predict potential interview questions based on your resume.

Predict Questions

Interview Practice Timer

Use our mock interview trainer to perfect your answers under timed conditions.

Start Timer

Behavioral Mastery

Ace tricky behavioral interviews with our AI-powered practice module.

Master Answers

Question Journal

Confidentially record interview questions you were asked for future reference.

Open Journal

Interview Ace

A comprehensive tool to help you master every aspect of your interviews.

Become an Ace

Q&A Logs

Confidentially track your answers to common questions and refine them over time.

View Logs

Application Planner

Schedule and organize your job applications in one confidential planner.

Open Planner

Cover Letter Tool

Create perfect, tailored cover letters for each application with AI support.

Generate Letter

Resume Score

Get instant feedback on your resume with our NLP-supported analysis tool.

Check My Score

ATS Score

Check your resume's compatibility with Applicant Tracking Systems (ATS).

Check ATS Score

Application Analyzer

Use AI to analyze job descriptions and optimize your application materials.

Analyze Application

Career Visualizer

Confidentially plan and visualize your long-term career path and goals.

Visualize My Career

Offer Genius

Get intelligent insights and strategies to confidently negotiate job offers.

Negotiate Offers

JobFlow

Track your entire job search progress from application to offer with this intelligent tool.

Track My Flow

JobSense

Our intelligent matching engine that provides smart job recommendations.

Get Smart Matches

Networking Toolkit

Tools to build and manage your professional connections. All data is confidential.

Build Network

Professional CV

A classic, O*NET supported template for corporate and professional roles.

Use This Template

Executive CV

A premium, O*NET supported template designed for senior and C-level positions.

Use This Template

Modern CV

A fresh, stylish, O*NET supported template perfect for tech and modern industries.

Use This Template

Creative CV

A visually distinct, O*NET supported template for design and artistic roles.

Use This Template

Minimalist CV

A clean, simple, O*NET supported template that focuses purely on content.

Use This Template

Europass CV

The standard European Union recommended format for wide compatibility.

Use This Template

Student CV

An institution-recommended template perfect for internships and first jobs.

Use This Template

Graduate CV

An institution-recommended template for recent graduates entering the workforce.

Use This Template

Academic CV

The researcher-recommended format for roles in academia and research.

Use This Template

Developer/IT CV

A tech-savvy recommended template to highlight your technical skills.

Use This Template

Skilled Worker CV

A trades-recommended template to showcase hands-on skills and experience.

Use This Template

Monochrome CV

A sleek, black-and-white, O*NET supported template for a professional look.

Use This Template

Art CV

An artist-recommended template that allows your creativity to shine.

Use This Template

Harvard CV

A researcher-recommended template based on the classic Harvard format.

Use This Template

Volunteer Research

Help us improve our platform by joining our community research program.

Join Research

Review Us

Share your experience with our tools to help other job seekers.

Share Experience

Register

Create your free account to save jobs, build your profile, and track applications.

Create Account

Login

Access your dashboard, manage applications, and continue your job search.

Access Your Account

Profile Builder

Create a comprehensive professional profile that attracts recruiters and showcases your skills.

Build Your Profile

View Profile

See your public profile exactly as employers will see it. Make sure it's perfect.

Preview Profile

Bookmarked Jobs

Keep track of all your saved job opportunities in one organized place.

View Saved Jobs

Your Reviews

View and manage all the company reviews you've submitted.

See Your Reviews

Following

Manage the list of companies you follow to stay updated on their new openings.

Manage Following

Find Companies

Discover and research top employers in your country and industry.

Discover Employers

Standalone CV Builder

Use our O*NET supported CV builder to create a professional resume from scratch.

Build Your CV

PDF to DOC (Beta)

Convert your PDF resumes or documents into editable Word (DOC) format.

Convert PDF

DOC to PDF (Beta)

Create universally compatible PDF documents from your Word (DOC) files.

Create PDF

General FAQ

Find answers to common questions about our job site and platform.

Read FAQ

Job Seekers FAQ

Get help and find answers to questions specifically for job seekers.

Get Help

Job Matching

Learn about the technology and algorithms behind how we match you to jobs.

Learn How

Personalized Matching

Discover how we use your profile and activity to provide customized job suggestions.

Learn More

Quick Apply

Understand our fast application process and how to make the most of it.

Learn More

Alert Frequency

Learn how to manage your job alert settings so you get the updates you want.

Manage Settings

Job Alerts Guide

A complete guide to understanding how job alerts work and how to use them effectively.

Read Guide

Resume Matching

Learn how our system matches your resume to job requirements.

Learn More

Ethical Branding

Read our guide to building a professional and ethical personal brand.

Read Guide

Candidate Visibility

Learn how to increase your visibility to recruiters on our platform.

Increase Visibility

Verified Badge

Find out how you can get a verified badge to build trust with employers.

Get Verified

AI ATS Technology

Learn about the advanced AI and ATS technology that powers our platform.

Learn More

ATS Ranking

Understand how Applicant Tracking Systems rank you as an applicant.

Learn More

Semantic Matching

Learn how our AI-powered semantic matching goes beyond keywords.

Learn More

    Fullstack Developer Reactpythonnet Cloud Apis Jobs in United Kingdom Job Search Guide, Trends and Insights