Javascript Fullstack Engineer Senior Jobs in London, UK

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

Javascript Fullstack Engineer Senior

With over 20 years of fully remote experience, Lumenalta offers: Fully remote work Rapid growth opportunities Self-Improvement What You Will Work On Collaborate with visionary enterprise clients Learn how to handle difficult situations ...

Javascript Fullstack Engineer Senior

We are actively building a pipeline of experienced engineers for upcoming client projects, with some opportunities expected to begin as soon as possible. While start dates are dependent on project timing, this role reflects active hiring needs aligned with confirmed and anticipated work. Candidates who are ...

Senior Fullstack Software Engineer (JavaScript & TypeScript,)

Company Description Legal & General (L&G) is a leading UK financial services group and major global investor. We’ve been safeguarding people’s financial futures since 1836, and strive to build a better society, while improving the lives of our customers and creating value for sharehold ...

Senior Fullstack Software Engineer (JavaScript & TypeScript,)

Full-time Permanent/Regular or Fixed Term Contract/Temporary: Permanent (UK and ROW) / Regular (US) L&G Business Unit: Legal & General Retail L&G sub Business Unit: LGI Primary Location: London, One Coleman Street Job Family: IT & Change Comp ...

Senior Fullstack Software Engineer (JavaScript & TypeScript,)

Job Description We are seeking a Senior Software Engineer to join a high‑performing engineering team delivering robust, scalable, and high‑quality software solutions. In this role, you will apply your technical expertise and strategic mindset to design and build new features, resolve complex issu ...

Senior JavaScript Engineer

Job Description Make sure to read the full description below, and please apply immediately if you are confident you meet all the requirements.Senior Full-Stack JavaScript Engineer / Senior Developer / Staff Engineer (JavaScript) – Thought Leader Node.js / React / Next.js / AWS Serverless ...

Senior Javascript Engineer

Senior Javascript Engineer (up to £76,000 per annum) 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 reaches millions of people a month across digital, print, video, podca ...

Senior Javascript Engineer

Senior Javascript Engineer (up to £76,000 per annum) 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 reaches millions of people a month across digital, print, video, podca ...

Senior Javascript Engineer

Overview Senior Javascript Engineer (up to £76,000 per annum) 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 reaches millions of people a month across digi ...

Senior Javascript Engineer

About the role You’ll be working on Fabric, our digital publishing platform, to design and build scalable APIs and AI powered text, audio and video content services, that integrate internal systems with third party platforms. Immerse yourself in our technical ecosystem Develop ...

Senior JavaScript Engineer

This Senior JavaScript Engineer role is with a startup who are one of fastest growing in their field. They’ve just gone through a round of funding and need to up their productivity so are looking for an extra pair of hands to join their team in Mayfair.Good amount of tech on site including Python, Reac ...

Senior Javascript Engineer

Senior Javascript Engineer (up to £76,000 per annum)                               At Immediate, we’re home to some of the biggest and m ...

Senior Javascript Engineer

Senior Javascript Engineer (up to £76,000 per annum)                               At Immediate, we’re home to some of the biggest and m ...

Senior JavaScript Engineer

This Senior JavaScript Engineer role is with a startup who are one of fastest growing in their field. They’ve just gone through a round of funding and need to up their productivity so are looking for an extra pair of hands to join their team in Mayfair.Good amount of tech on site including Python, Reac ...

Senior Fullstack Engineer

Midnite is a next-generation sports betting and gaming platform built for a new wave of players. We combine sharp product thinking, bold brand, and fast execution to create experiences that feel modern, intuitive, and built for how people actually play today. Over 400,000 players have alrea ...

Senior Fullstack Engineer

QA slows the world down. Flaky tests kill trust, stall releases, and bleed engineering velocity. Duku AI is ending that era. We're building autonomous agents that think like engineers: they run every critical user journey, catch failures before users do, and self-heal as the codebase evolve ...

Senior Fullstack Engineer

This range is provided by Peaple Talent. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range Peaple Talent is thrilled to partner with a top-tier software company in search of a Senior Full Stack Engineer. This is an exciting opp ...

Senior Fullstack Engineer

Join to apply for the Senior Fullstack Engineer role at Siena AI. Meet Siena Siena is the first intelligence layer for customer experience. We're creating an operating system of AI agents that learn, remember, and act across every customer touchpoint—from support conversations to shopping ...

Senior Fullstack Engineer

Join to apply for the Fullstack Engineer role at Stacks This role is based out of our Amsterdam office ...

Senior Fullstack Engineer

Req ID: Competitive salary | UK: hybrid: London (Canary Wharf) + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market presence and our ...

Senior Fullstack Engineer

Competitive salary | UK: hybrid: remote + London At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market presence and our ability to help our clients stay a step ah ...

Senior Fullstack Engineer

Req ID: Competitive salary | UK: hybrid: London (Canary Wharf) + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market presence and our ...

Senior Fullstack Engineer

Senior Fullstack Engineer Application Deadline: 31 May 2026 Department: Engineering Employment Type: Permanent - Full Time Location: London Compensation: £70,000 - £85,000 / year Description About us ...

Senior Fullstack Engineer

Midnite is a next-generation sports betting and gaming platform built for a new wave of players. We combine sharp product thinking, bold brand, and fast execution to create experiences that feel modern, intuitive, and built for how people actually play today. Over 400,000 players have alrea ...

Senior Fullstack Engineer

This job is brought to you by Jobs/Redefined, the UK's leading over-50s age inclusive jobs board. Req ID: Competitive salary | UK: hybrid: London (Canary Wharf) + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, in ...

Senior Fullstack Engineer

Overview Lavanda is a B2B software company. We’ve developed an award-winning, best-in-class SaaS platform that enables Multifamily and Student accommodation operators to optimise their portfolios with a comprehensive short and medium-term rental solution. Our software toolkit enables partne ...

Senior Fullstack Engineer

Join an exciting journey with a rapidly expanding AI-driven cybersecurity innovator. I am looking for a Senior Fullstack Engineer to join my client’s dynamic team. With a salary of up to £100,000 plus enticing stock options and hybrid working from London. My client’s cutting-edge SAAS solution is tru ...

Senior Fullstack Engineer

Join an exciting journey with a rapidly expanding AI-driven cybersecurity innovator. I am looking for a Senior Fullstack Engineer to join my client’s dynamic team. With a salary of up to £100,000 plus enticing stock options and hybrid working from London. My client’s cutting-edge SAAS solution is tru ...

Senior Fullstack Engineer

Req ID: 363680 Competitive salary | UK: hybrid: London (Canary Wharf) + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s ...

Senior Fullstack Engineer

Req ID: 363680 Competitive salary | UK: hybrid: London (Canary Wharf) + remote At NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s ...

Senior Fullstack engineer

TEC Partners is currently collaborating with the latest AI Unicorn, They are after a Senior / Principal / Staff Engineer to join their core services team, and you will lead the charge in building and maintaining a distributed system for user-specific voices. This role offers the unique opportunity to contribu ...

Senior Fullstack engineer

TEC Partners is currently collaborating with the latest AI Unicorn, They are after a Senior / Principal / Staff Engineer to join their core services team, and you will lead the charge in building and maintaining a distributed system for user-specific voices. This role offers the unique opportunity to contribu ...

Senior Fullstack Engineer

JOB DESCRIPTION Req ID: 363680Competitive salary | UK: hybrid: London (Canary Wharf) + remoteAt NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market prese ...

Senior Fullstack Engineer

JOB DESCRIPTION Req ID: 363680Competitive salary | UK: hybrid: London (Canary Wharf) + remoteAt NTT DATA, we know that with the right people on board, anything is possible. The quality, integrity, and commitment of our employees are key factors in our company’s growth, market prese ...

Senior Fullstack Software Engineer

Position Overview We areseekinga highly skilled Senior Full Stack Software Engineer to join our team supporting research and foundation model development. This roleoperatesat the intersection of research scientists, ML engineers, and infrastructure teams, enabling rapid experimentation, p ...

Senior Fullstack Software Engineer

**Job Requisition ID #** 26WD97703 **Position Overview** We are seeking a highly skilled Senior Full Stack Software Engineer to join our team supporting research and foundation model development. This role operates at the intersection of research scientists, ML engineers, and infrastru ...

Senior Fullstack Software Engineer

We are seeking a highly skilled Senior Full Stack Software Engineer to join our team supporting research and foundation model development. This role operates at the intersection of research scientists, ML engineers, and infrastructure teams, enabling rapid experimentation, prototyping, and model deployment.You a ...

Senior Fullstack Engineer London

At Capi , we help businesses in emerging markets pay their international suppliers - simply, quickly, and fairly. Backed by $18M+ from top-tier investors like Creandum, Y Combinator, General Catalyst, and angels from Revolut, Checkout, Stripe, and Remitly, we’re building the financial infras ...

Senior Software Engineer (fullstack)

Our client is an established D2C brand known as a leader within the niche space they operate. You’ll join a small, internal engineering team as they shape a new greenfield commerce platform. This role is for a 6 month, full-time contract. Responsibilities: Work in an agi ...

Senior Product Engineer (Fullstack)

Senior / Staff Product Engineer (Full Stack) I’m partnering with a London-based AI startup that recently secured Series B funding and is developing innovative AI-driven products. They’re looking for a Senior or Staff Full Stack Product Engineer who enjoys building features end to end and seeing t ...

Senior Fullstack Engineer TechOps

Overview Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we became Britain’s largest energy supplier. Now, we’re scaling ...

Senior Fullstack (Elixir) Engineer

Overview Remote Working Flexible remote options A Bit About Us We’re Doccla, and we’re redefining where and how healthcare is delivered. Our Virtual Ward and Remote Monitoring Solutions enable hospitals and health systems to care for patients at home. We support patients a ...

AI Senior Fullstack Engineer

About Contentsquare Contentsquare is the all‑in‑one experience intelligence platform designed to be easily used by anyone who cares about digital journeys. With our flexible and scalable platform, organizations quickly get a deep understanding of their customers’ whole online journey. We ...

Senior Fullstack Engineer, Growth

Senior Fullstack Engineer, Growth (Visa Sponsorship and relocation to the UK offered) Senior Fullstack Engineer, Growth (Visa Sponsorship and relocation to the UK offered) Get AI-powered advice on this job and more exclusive features. About MoonPay Hi, we’re MoonP ...

Senior Fullstack Engineer TechOps

Overview Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we became Britain’s largest energy supplier. Now, we’re scaling ...

Senior Fullstack Engineer TechOps

Overview Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we became Britain’s largest energy supplier. Now, we’re scaling ...

Senior Fullstack Software Engineer

We are seeking a highly skilled Senior Full Stack Software Engineer to join our team supporting research and foundation model development. This role operates at the intersection of research scientists, ML engineers, and infrastructure teams, enabling rapid experimentation, prototyping, and model deployment ...

Senior Fullstack Software Engineer

The pitch. It’s a serious engineering role with a great team – and meaningful responsibility. This is not a narrow “ticket-closing” developer job. You won’t be handed tightly scoped Jira tasks inside a heavily layered team structure. You won’t be maintaining a disposable MVP. And yo ...

Senior Fullstack Software Engineer

The pitch. It’s a serious engineering role with a great team – and meaningful responsibility. This is not a narrow “ticket-closing” developer job. You won’t be handed tightly scoped Jira tasks inside a heavily layered team structure. You won’t be maintaining a disposable MVP. And you won’ ...

🚀 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

    Javascript Fullstack Engineer Senior Jobs in London Job Search Guide, Trends and Insights