senior javascript engineer jobs in City of London

You will be joining a technology team who have a passion for innovation, collaboration as well as embracing new ideas, technologies and approaches. As a Senior Software Engineer, you will be working closely with Product and design, taking full responsibility and ownership from conception to post-deployment.

Senior Full-Stack Engineer - Go/JavaScript Salary: £80,000 - £90,000 Location: Fully-remote Tech: Go, JavaScript, .NET About the role: We’re working with a leading organisation in the legal sector, renowned for their award-winning approach to technology-driven innovation, in support of their efforts to strengthen their growing SaaS team. They are looking for a senior software engineer with...

Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. Before applying for this role, please read the following information about this opportunity found below. The successful candidate...

You will be engaged in designing and delivering scalable data solutions that power key insights across the organisation. It is an ideal opportunity for a Data Engineer who has extensive experience working with Big Data technologies and Palantir Foundry. What You’ll Do: Build and deploy large-scale data processing systems, leveraging Big Data frameworks and cloud platforms.

Principal JavaScript Engineer (with C++ / Java / C# exposure) Location: London (Hybrid – 2 days WFH) Salary: £150,000 - £200,000 (Permanent)pension, private healthcare, gym membership, 25 days + 8 BH holiday allowance, tech/hardware budget. Do you have the right skills and experience for this role Read on to find out, and make your application. A high-growth software company is building the...

QA Engineer | C# | JavaScript | Playwright | FinTech | £95,000 The information below covers the role requirements, expected candidate experience, and accompanying qualifications. My client is seeking a QA Engineer to work across the front, middle and back office. This role is seeking candidates who have exposure to the below skill set and come from a financial background. Location -...

We’re partnering exclusively with one of the most prestigious trading firms in London to find a highly skilled Front-End Software Engineer to join their world-class engineering team. This is an opportunity to work at the very heart of high-performance trading technology — building ultra-responsive, visually intuitive web interfaces for some of the most demanding users in finance. What You’ll Be...

Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful candidate will contribute to the growth of the platform, exercising an eye for detail across all aspects of the...

Full Stack Python / JavaScript Developer - London - £60k 1 day per week in office My prestigious financial services client is looking to expand their digital transformation team and require an experienced Full Stack Developer with strong Python & JavaScript to join them working across a range of new initiatives Core skills across Python and JavaScript with experience in Django and/or React are an...

Elixir Engineer London, UK (Hybrid – 3 days per week on-site) Contract (£500-650 outside) About the Role Join a fast-growing AI technology firm in London as an Elixir Engineer , building large-scale, data-driven systems that power intelligent automation and machine learning. You’ll work on high-performance backend services and APIs using Elixir/Phoenix , collaborating closely with data and DevOps...

About Medly AI We're the fastest-growing EdTech startup in London, on a mission to change education forever. We're living through a once-in-a-generation moment where AI-native companies are redefining entire industries - Cursor for code, Midjourney for image gen, Harvey for law. Medly is building a generational company for education. In just 4 months since launch, we’ve achieved retention rates...

You will be working on cutting edge platforms for Property Investments. If you feel you are ready to take the next step of your career then please apply via Link.

You will play a key role in building and scaling cutting-edge SaaS products that help businesses tackle complex energy and sustainability challenges. Key Responsibilities: - Design, develop and maintain high-quality web applications using TypeScript, Node.

Head of Engineering – Digital Product Studio (London / Hybrid)#128187; £130,000–£150,000 + Profit Share | Employee-Owned | AI, Mobile, Web, Cloud | Start Jan 2026 We’re working with a global digital product studio known for creating beautifully crafted, high-impact digital products and experiences. They partner with some of the world’s most innovative brands-combining design, technology, and...

You will play a key role in building and scaling cutting-edge SaaS products that help businesses tackle complex energy and sustainability challenges. Design, develop and maintain high-quality web applications using TypeScript, Node.

Software Engineer - Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, TypeScript, Cloud Tech, CI/CD, AI, ML Harrington Starr has partnered with an innovative Technology SaaS Company that specialise in developing unique software systems for clients for across Property Management for both commercial and private consumer markets. This organisation are developing cutting edge web-systems,...

Senior JavaScript Developer Any additional information you require for this job can be found in the below text Make sure to read thoroughly, then apply. 3-4 days p/week in London Paying up to £80k Senior JavaScript Developer – Would you like the opportunity to work for a fast growing start-up who are on a mission to create an AI tutor to help learners? They’re currently building an all-in-one...

Job Summary: Maximise your chances of a successful application to this job by ensuring your CV and skills are a good match. The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful...

QA Engineer #129489;#C# | JavaScript | Playwright | FinTech | £95,000#128183; My client is seeking a QA Engineer to work across the front, middle and back office. This role is seeking candidates who have exposure to the below skill set and come from a financial background. Hybrid Working - 3 days per week onsite #127970; Strong proficiency in C# and React development, with experience in manual...

You will be joining a small technology team who have a passion for innovation, collaboration, and providing the best service to their customers as well as embracing new ideas, technologies and approaches. As a JavaScript Engineer, you will be joining the organisation at one of the most exciting times.