javascript jobs in London

About LendableLendable is on a mission to build the world's best technology to help people get credit and save money. We're building one of the world’s leading fintech companies and are off to a strong start:One of the UK’s most exciting unicorns with a team of over 800 peopleAmong the fastest-growing tech companies in the UKProfitable since 2017Backed...

We are looking for an Enterprise Customer Success Engineer to lead complex customer integrations across EMEA. You will serve as a trusted technical partner throughout the integration lifecycle—from implementation planning and deployment through validation, standard tuning, optimization, and ongoing support.This role is ideal for someone who enjoys solving...

About LendableLendable is on a mission to build the world's best technology to help people get credit and save money. We're building one of the world’s leading fintech companies and are off to a strong start:One of the UK’s most exciting unicorns with a team of over 800 peopleAmong the fastest-growing tech companies in the UKProfitable since 2017Backed...

About Air AppsAt Air Apps, we believe in thinking bigger—and moving faster. We’re a family-founded company on a mission to create the world’s first AI-powered Personal & Entrepreneurial Resource Planner (PRP), and we need your passion and ambition to help us change how people plan, work, and live. Born in Lisbon, Portugal in 2018—and now with offices...

Job DescriptionOur client, a major Art’s venue located in the heart of London, is now looking for an experienced Senior React.js Developer to join the team. As a Senior React.js Developer, you will be involved from conception to completion with projects that are technologically sound and aesthetically impressive.We’re looking for developers who write...

Tessl is a fast-growing Series A startup based in London, founded by Guy Podjarny, who previously founded Snyk. We’ve raised more than $100 million from world-class investors, including Index Ventures, Accel, GV and Boldstart. In 2025, Tessl ranked #2 in Sifted’s B2B SaaS Rising 100 and #20 in its AI 100.We’re building the context layer for AI coding...

Our LINQ platform is the software that plans, schedules, and drives life-science labs. Our clients run labs for cancer diagnostics, drug discovery, cell manufacturing, synthetic biology and more.This role owns the interface to the lab — not just the UI, but every surface someone builds on or acts through: the app a scientist touches, the APIs and SDK an...

Endur Developer - E/CTRM (UK)Join Infosys’ commodity experts, MRE Consulting! We specialize in supporting market leaders in the energy sector, guiding them through the entire lifecycle of transactions—from the trading floor to commodity delivery. Our goal is to assist in managing enterprise risks and safeguarding profits.We differentiate ourselves from...

Front-End Developerup to 40K + 10% bonusQuant Capital is urgently looking for a junior to mid-level Front-End Developer to join our rapidly growing and high profile client.My client is a luxury online fashion house based in London, they are pegged as one of the fastest growing ecommerce platforms in Europe and are building a new unrivalled platform and...

React Developer (remote, Asian Time zone)A competition agency we are currently working with is looking for an experience React and React Native developer to join the team working remotely from anywhere in the world!The main tasks for the role will be to help build and maintain both web and mobile applications for the completion site.The technical stack you...

```htmlIntegration of Fragments...these fragments share overlapping content related to the required experience in languages and frameworks including JavaScript, React, TypeScript, Python, and GoLang. This overlap allows us to piece them together in the correct order. After combining the overlapping parts, we get:"Be a part of London’s next big step in the...

Company DescriptionWe’re Checkout.com. You might not know our name, but companies like eBay, Spotify, Klarna, Uber, and Sony do, because we’re behind many of the digital experiences you use every day. We are where the world checks out, enabling over 10 billion transactions yearly for more than one billion global shoppers. Whether you want to book a...

What we doWe are a global software and professional services company for the financial industry, with offices in the UK, USA, Germany, Brazil and Indonesia. We specialize in working with investment banks to automate the issuance process for structured products. For layman, a structured product is a financial investment (not unlike a savings account) where...

About usHumaans is building the next generation of infrastructure for the workplace; software designed for companies that are scaling fast, operating globally, and pushing into new boundaries.What started as a system of record has evolved into a broader platform for operating people globally. With Athena, our agentic AI layer, Humaans moves beyond data...

About LILTAI is changing how the world communicates — and LILT is leading that transformation.We're on a mission to make the world's information accessible to everyone, regardless of the language they speak. We use cutting-edge AI, machine translation, and human-in-the-loop expertise to translate content faster, more accurately, and more cost-effectively...

About UsWe are a dynamic and high-growth technology firm specialising in delivering high-performance, scalable web applications and enterprise solutions. Our culture is built on continuous improvement, strong technical ownership, and rapid deployment in an Agile environment. We encourage proactive communication and value developers who are eager to mentor...

Web DeveloperLondon  Our health and wellness client is currently looking for a web developer as they are currently going through an exciting digital transformation where we are seeing them going through a replatform and developing new apps. You will be involved in front end and back end development and work across all digital services. You will work with...

About usHumaans is building the next generation of infrastructure for the workplace; software designed for companies that are scaling fast, operating globally, and pushing into new boundaries.What started as a system of record has evolved into a broader platform for operating people globally. With Athena, our agentic AI layer, Humaans moves beyond data...

About usHumaans is building the next generation of infrastructure for the workplace; software designed for companies that are scaling fast, operating globally, and pushing into new boundaries.What started as a system of record has evolved into a broader platform for operating people globally. With Athena, our agentic AI layer, Humaans moves beyond data...

Senior Software Engineer | Data Visualisation & Graphics | LondonLondon (Hybrid)Salary up to £200,000 + benefitsAll candidates should make sure to read the following job description and information carefully before applying.Most engineers consume visualisation libraries.A small number build them.We’re working with a highly successful software company...