• United Kingdom Jobs Expertini profile avatar

    • Senior React Developer Reactjavascript Jobs in UK

    Professional job seekers finding United Kingdom jobs through Expertini
    750,000+ professionals on Expertini 750,000+ Candidates
    Join our global community
    Explore Leading Employers
    High-Paying Careers
    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.

    1. Expertini
    2. United Kingdom
    3. Jobs
    4. Senior React Developer Reactjavascript Jobs in United Kingdom

    5. Download PDF

    Reset

    Create Job Alert
      Add Alert

     
     
    Create Alert
     
    Reset

    C# .NET Backend Engineer Hybrid, Up to £50k

    Proactive Appointments is seeking a Mid-Level Backend Software Developer (.NET) in Taunton, Somerset. The ideal candidate will have 2-3 years of commercial experience with C# and .NET Core and will join a collaborative development team. This hybrid position requires building scalable applications and maintaining ...

    Senior Full Stack Engineer & Power Platform Lead

    Boston Consulting Group (BCG) in Greater London is seeking a Full Stack Developer & Power Platform Engineer. You will design and enhance applications for internal operations, working across front-end and back-end layers. Candidates should have 7-10+ years of experience, strong skills in .NET Core and C#, and han ...

    Lead Data Centre Project Director

    Falcon Green Personnel is seeking a Project Director for a £300m data centre project in West London. This role involves comprehensive operational, design, and commercial control, overseeing a specialist management team. The ideal candidate will have experience delivering projects valued over £100m, preferably in ...

    Manufacturing Documentation Specialist – SOP & CI

    REFRESCO in Bridgwater is seeking a Document Developer for a Fixed-Term Contract to enhance operational excellence. You will create and refine critical documentation supporting efficiency and consistency. The ideal candidate has at least three years of experience in documentation, advanced Microsoft skills, and ...

    Backend C# .NET Engineer Real Time Sports Trading London

    Client Server is seeking an experienced Software Engineer / Developer specializing in C# .Net to join their London office. This full-time role involves designing and developing real-time trading systems, with a focus on backend projects. Candidates should have a strong background in databases, computer science f ...

    Finance Systems Analyst: TM1 & Planning Analytics Specialist

    Michael Page is looking for a Finance Systems / TM1 Developer in Leicester to oversee the integrity of financial data. The role involves managing data flows to finance systems primarily using Cognos TM1, performing data cleansing, and driving insightful financial analysis. Candidates should have advanced knowled ...

    Quant Dev: Launch & Scale New HFT Strategies

    A leading financial firm in London seeks a Quantitative Developer to join a new HFT team. You will play a crucial role in launching and ensuring the profitability of this new desk. The ideal candidate is experienced in quantitative roles, proficient in Python (C++ is a plus), and ready to face multifaceted chall ...

    Senior Backend Engineer: Platform & Architecture for B2B SaaS

    A pioneering tech startup in Greater London is seeking a talented engineer to define product direction and shape backend architecture. This role is key in building solutions for customer problems and enhancing the developer experience. If you thrive in early-stage environments and have a proven track record in B ...

    Senior Full Stack Engineer Remote, Flexible Hours, Retention Bonus

    A tech firm in Greater London seeks a seasoned full-stack developer to drive the continued evolution of our applications. You're expected to bring over 10 years of PHP expertise and substantial experience with frontend frameworks. The role entails managing features, writing tests, and collaborating deeply on all ...

    Backend Engineer FinTech Data Platform (Python/AWS)

    A financial technology company in Greater London is seeking a Python Backend Developer to lead technical projects, mentor junior developers, and develop backend services for their platform. This role involves working with Python, Flask, FastAPI, SQL, and AWS technologies. The ideal candidate will have strong col ...

    Remote Blockchain Engineer – Build Scalable, Secure Solutions

    A leading recruitment firm is seeking a Blockchain Developer to design and implement cutting-edge blockchain solutions. The ideal candidate will have a Bachelor's degree in Computer Science and 1-3 years of experience in software engineering with a focus on blockchain. Responsibilities include developing new blo ...

    iOS Engineer III – FinTech Wealth App

    A leading financial services firm in Greater London is seeking a skilled iOS Developer to join their team. The ideal candidate will possess strong experience in iOS mobile application development using Swift and Xcode, with a focus on delivering high-quality software. Responsibilities include developing product ...

    ROV Software Test Engineer — C#, WinForms & Unit Testing

    A technology company specializing in underwater robotics is seeking a developer to join their Edinburgh team. This role involves improving and maintaining applications for controlling ROVs, focusing on unit testing and collaboration with hardware teams. Candidates should have a degree in computer science, and st ...

    D365 F&O Finance Engineer — Lead & Deliver

    A leading technology company is seeking an experienced D365 Developer to join their team in Greater London. You will lead D365 projects, develop custom solutions, and provide mentorship to the team. The ideal candidate will have over 6 years of experience in Dynamics 365 development with strong skills in X++, Ty ...

    Senior Java Architect Hybrid Role in London

    A global digital engineering provider is seeking a seasoned Java Developer for a hybrid role in London. The successful candidate will work on complex applications, leading initiatives and mentoring peers. Responsibilities include designing Java and Python systems, collaborating with international teams, and ensu ...

    Android Technical Lead Strategy & Delivery

    A digital product agency is seeking a Lead Android Developer to guide the technical excellence in Android application development. The successful candidate will lead projects, mentor team members, and ensure high-quality delivery. Candidates should have over two years of experience in a Lead capacity, excellent ...

    Cloud DevOps Engineer – CI/CD & Observability

    A leading data analytics firm in Greater London is seeking a DevOps Engineer to design and maintain automation and cloud infrastructure for efficient software delivery. You will collaborate with development, architecture, operations, and security teams to improve stability and scalability of production systems. ...

    Azure Cloud Full‑Stack Engineer: Build Modern Cloud Apps

    A leading technology company in the UK is seeking an Application Developer specializing in Azure Cloud FullStack development. You will contribute to cloud-native applications using Azure services and collaborate with experienced professionals. This role requires expertise in developing rich UI applications and s ...

    Backend Kotlin Engineer Remote, Flexible Hours, Growth

    A leading cashless payment solutions firm in the UK is seeking a backend developer proficient in Kotlin. You will build a secure and performant backend while collaborating with teams to enhance user experience. The role offers significant growth opportunities in a supportive startup environment, along with compe ...

    Backend Engineer (Kotlin/Spring Boot) Remote & Flexible

    A financial technology startup in the United Kingdom is seeking a Backend Developer to build secure and performant solutions using Kotlin or Java. You will collaborate with teams to enhance user experience and integrate third-party APIs. Ideal candidates should have significant backend development experience, pr ...

    Senior Java Lead — Biometric Systems (SC Cleared)

    A leading technology firm in the UK seeks a skilled Lead Java Developer to create and implement solutions for biometric products. The role involves supporting live systems and diagnosing incidents in a collaborative team. Successful candidates will have 8-10 years of experience in large-scale Java projects, with ...

    Backend Java Engineer – Data Fabric Platform

    A leading consulting firm is looking for a Backend Java Developer specializing in Data Fabric and Platform Engineering. The role involves building core backend services in Java and implementing deterministic policy engines for data governance. Ideal candidates will have strong Java and SQL expertise along with e ...

    Platform Engineer: Scale Kubernetes & Cloud Infra

    A technology organization is seeking a Platform Engineer in Colchester to design and maintain an internal developer platform and cloud infrastructure. This role focuses on enabling teams to ship software reliably and securely. Responsibilities include evolving CI/CD pipelines and implementing Infrastructure as C ...

    Senior iOS Engineer On Device ML & Immersive UI

    A memory curation platform company in the UK is looking for an iOS Developer to enhance its photo curation app. Your role involves using Swift to build features that automate photo organization and create high-quality products. Collaboration and a problem-solving attitude are essential as you work on user-centri ...

    Low Latency eFX Java Algo Engineer

    A global consulting firm in London is seeking an experienced eFX Java Developer to design and maintain low-latency applications for electronic FX trading systems. Ideal candidates have a strong background in Core Java, multithreading, and real-time market connectivity, with experience in trading environments ess ...

    Senior AI Forward Deployed Engineer, Cloud & CES

    A leading global technology company in London is seeking a Forward Deployed Developer to apply generative AI solutions to client challenges. The role demands 8+ years of software development experience, strong ML infrastructure skills, and the ability to lead technical projects. You will engage directly with cus ...

    Backend Engineer Fintech & Blockchain Platform

    A fintech organization based in Belfast seeks an experienced Developer to design and maintain scalable solutions. You will collaborate with a growing team, mentor peers, and work on innovative projects at the intersection of finance and blockchain. Ideal candidates will have over 3 years of development experienc ...

    DAML & Canton Network Engineer (Hybrid – Wrexham)

    A leading consultancy firm in the UK seeks a DAML Developer to work on the Canton Network. The role entails developing and maintaining DAML smart contracts, configuring network components, and ensuring compliance and security in financial markets. Candidates should have 4+ years of direct experience with DAML an ...

    Lead Software Engineer Architecture & Impact (Hybrid)

    A leading recruitment firm is looking for a Lead Software Developer in Brighton. The successful candidate will guide a software team, oversee technical decisions, and work on scalable systems. This hybrid role requires being in the office at least once a week and offers a competitive salary alongside a comprehen ...

    eDV Cleared Java Engineer: Microservices & Cloud

    A leading recruitment agency is seeking an eDV-cleared Java Developer to join a skilled engineering team in the UK. The role involves hands-on development of complex software systems utilizing modern DevOps practices. Ideal candidates are experienced in Java, Spring, and CI/CD pipelines, and have a passion for w ...

    Residential Planner – New Build Housing & Appeals

    A growing residential developer in the East Midlands is seeking a proficient Planner to oversee the full planning lifecycle, from site appraisals to appeals. The ideal candidate will possess a degree in Town Planning, have 2-4 years of relevant experience, and demonstrate strong UK planning knowledge and report ...

    Global Engineering Enablement Manager

    A leading energy technology firm in the United Kingdom is seeking a Project Leader to drive critical initiatives across their organization. This role involves leading planning and coordination for large-scale projects, rolling out major internal systems and processes, and improving the Developer Experience acros ...

    Hyperscale Data Centre Mechanical Project Manager

    A leading data centre developer in Greater London is seeking an experienced Mechanical Project Manager to lead critical mechanical systems delivery for a major hyperscale campus. This role presents a unique opportunity to work client-side, shaping Europe’s AI infrastructure. The ideal candidate has proven mechan ...

    Founding AI Engineer — Industrial SaaS (CTO Path)

    A fast-growing industrial manufacturing firm is seeking an experienced AI Developer for their SaaS startup in Slough. The role involves designing and deploying AI features, integrating LLM-driven agents, and collaborating with engineers on production delivery. Candidates should have over 5 years of experience in ...

    Generalist Full Stack Engineer for Charities

    A tech-driven charity platform in Greater London is seeking an experienced full stack developer to play a crucial role in shaping their innovative software. The candidate will be responsible for writing front-end and back-end code in JavaScript and TypeScript, and will work collaboratively on architecture and fe ...

    Security Consultant: Data Security & Risk Strategy

    A leading technology company is seeking an Application Developer to innovate and solve complex problems within various projects. You will be involved in translating system requirements into code and collaborating with teams to implement secure solutions. A strong technical background in programming and security ...

    Finance Leader & FP&A Strategist

    A leading property developer in Kings Hill is seeking an experienced Head of Finance to take accountability for forecasting, budgeting, and reporting within the finance team. The ideal candidate will possess a qualified accountant designation (ACA, ACCA, CIMA), significant experience in commercial finance, and s ...

    Growth Hunter: Circular IT Partnerships & Revenue

    A forward-thinking tech partner in the UK is seeking a Business Developer to drive sales growth. This pivotal role involves managing the entire sales cycle, from prospecting to closing, and building long-term relationships with clients. The ideal candidate will be data-driven and skilled in sales automation tool ...

    Head of Multi Cloud Platform Engineering

    A leading global data and analytics firm based in London seeks a Director of Platform Engineering to oversee the transformation to a multi-cloud platform. The role involves leading globally distributed teams, defining platform strategies, and enhancing developer productivity. Ideal candidates should have over a ...

    FX Risk Java VP Engineer – High Performance, Hybrid

    A leading global bank in Greater London is seeking an experienced FX Risk Java Developer. The role involves writing high-performance Java applications, managing risk calculations, and implementing efficient data structures. Candidates should have strong knowledge of Core Java, multithreading, SQL/No SQL database ...

    Senior Web3 Backend Engineer – Remote (Solidity & Golang)

    A leading recruitment agency in the UK is looking for an experienced Backend Developer specializing in Solidity and Golang. Join an early-stage decentralized Crypto project that offers the opportunity to work on groundbreaking blockchain technology. The ideal candidate has over 5 years of backend experience and ...

    Senior SAC Analyst: SAP Analytics Cloud Finance & Planning

    A leading technology solutions provider is seeking a hands-on SAP Analytics Cloud (SAC) developer to shape financial and sales planning. In this role, you'll collaborate with executive leadership to design solutions that facilitate smarter business decisions. The ideal candidate has strong experience in developi ...

    Junior Data Analytics & Visualization Engineer (Hybrid)

    A leading motorsport team in the UK is seeking a skilled software developer to create tools for the analysis and visualization of experimental data. You will work closely with engineers to enhance car performance through innovative software solutions. A strong academic background in Mechanical or Aeronautical En ...

    Fabric BI Engineer — Modern Azure Data Platform (Remote)

    A data solutions provider is seeking a Fabric BI Developer to design and deliver scalable data platform solutions. You will build data pipelines and develop Power BI models, working closely with cross-functional teams. Strong SQL and Azure skills are required, along with a technical background in enterprise BI e ...

    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 ...

    Full Stack Engineer (C#/.NET) Build Next Gen Address Tech

    A leading address data company based in Wrexham is seeking a Developer to contribute to the development of next-generation address management software. This entry-level full-time position offers a competitive salary of £30,000 plus a performance-based bonus. Candidates should have 2-5 years of experience in C# a ...

    Mobile App Engineer — iOS & Android, Build Innovative Apps

    A dynamic application development firm in London seeks a creative and skilled Mobile Application Developer. You will design, develop, and maintain high-quality mobile applications for both iOS and Android. Responsibilities include collaborating with cross-functional teams, optimizing performance, and staying inf ...

    Senior Front End Engineer – Real Time Web UI

    A consulting firm is seeking a front-end developer for their Issuemaster real-time web application in Greater London. The ideal candidate will have at least 4 years of experience with Angular, 3 years with Typescript, and expertise in real-time web application development. Responsibilities include developing bus ...

    Senior Backend Engineer Cloud Native APIs & Pipelines

    A technology solutions company based in Coventry is looking for a skilled developer to lead the creation of secure, scalable cloud-native backend systems. This role requires extensive experience with AWS services, strong Python proficiency, and an understanding of infrastructure automation. You will collaborate ...

    Senior Python Backend Engineer — APIs & Architecture

    A leading global technology firm is seeking a skilled Python Developer based in Glasgow. The role involves designing, developing, and maintaining Python interfaces and backend services, ensuring code quality and performance optimization. The successful candidate will collaborate with analysts to translate specif ...

    🚀 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 →

    💡 Tools that really enhance your application chances and career growth.

    Go to Your Dashboard →

      Senior React Developer Reactjavascript Jobs in United Kingdom Job Search Guide, Trends and Insights