126 to 150 of 313 JavaScript Jobs in the City of London

unit and integration tests, and participate in the deployment process to ensure a smooth transition to production environments. What We’re Looking For Frontend : Proficient in ReactJS and modern JavaScript (ES6+). Experience with Redux or Context API for state management Familiar with frontend build tools (Webpack, Babel, etc.) and CSS frameworks (Sass, Tailwind). Knowledge of RESTful APIs and More ❯

in agile development environments. Qualifications we seek in you! Minimum Qualifications/Skills BS/MS degree in a STEM/Computer Science related field. Strong knowledge of React, JavaScript/TypeScript, and front-end development best practices Experience with state management libraries (e.g., Redux, Context API). Familiarity with RESTful APIs and integrating front-end with back-end services. More ❯

Lunches and Team Meetings. Key Skills & Attributes: Self-motivated, capable of independent contributions. Skilled in several of our key languages/frameworks in our web technology stack including Node.js, JavaScript, TypeScript and React. Develops to standards and best practices on a team. Prioritises tasks using knowledge of the business, clients, and end users. Clear communication skills via a multitude of More ❯

Assist, etc & other related applications & 3rd party software integrations with ServiceNow. Experience with CMDB design, architecture, and implementations, MID Server management, Discovery, Service Mapping, ATF. Experience in Glidescripting, Python, JavaScript, REST/SOAP APIs, HTML, CSS, Workflow and UI development and Service Portal Concepts, business rules, client scripts, data imports, custom apps, and development methods. Relevant ServiceNow certification eg. ServiceNow More ❯

Full Stack Angular Developer with AWS and Java (London, UK) Get The Future You Want! Choosing Capgemini means choosing a company where you will be empowered to shape your career in the way you’d like, where you’ll be More ❯

Senior Full Stack Engineer Contract Role | JavaScript/Typescript | B2C, Scale-up | UK Fully Remote | £500pd, Outside IR35 | 6 month Contract, likely extension Urgently hiring for x2 Full stack engineers, experienced required: 6+ years experience working with JavaScript/TypeScript for fast growth product companies. Frontend: React, Sass, and Storybook Backend: Node, Express, PostgreSQL Infrastructure: AWS ClickHouse desirable, but not … have's are: Confidence with performing in Leetcode style interviews (Data Structures and Algorithms) A degree in Computer Science or Software Engineering related Senior Full Stack Engineer Contract Role | JavaScript/Typescript | B2C, Scale-up | UK Fully Remote | £500pd, Outside IR35 | 6 month Contract, likely extension * If interested, please apply here and we will reach out to you if it More ❯

stack: - 7+ years of experience in Angular 2+ development, with a strong focus on API integration, particularly using Typescript - 5+ years of experience with HTML, CSS/SCSS and JavaScript - Advanced level capability with creating pixel-perfect web interfaces based on provided design mockups This role is INSIDE IR35 More ❯

Staff to Principal JavaScript Engineer | £110,000–£150,000 + Equity | TypeScript | React | Node.js | Hybrid (3 Days in Victoria) A high-growth, VC-backed SaaS startup is redefining how modern businesses manage spend—streamlining everything from software requests to supplier approvals. With enterprise customers already onboard and 10x growth on the horizon, they’re looking for exceptional full-stack engineers More ❯

Our client is on a mission to reshape global access to education by building a next-generation digital learning platform. This is a unique opportunity to build something meaningful from day one - an EdTech platform designed to expand access to More ❯

Lead Backend Engineer (Node.js Focus) | TypeScript | AWS | £120,000 + Equity | Hybrid (3 Days in Vauxhall) Step into a hands-on leadership role where your backend skills directly power real-world operations—from inventory management and logistics to store productivity More ❯

Front End Software Engineer/React UI JavaScript, React, typescript, Redux, NodeJS, GraphQL, ApolloQL, Webpack, Cypress, HTML, CSS, REST, Data Visualisation, API - Perm Role – London – Hybrid £80'000- £100'000 plus bonus Harrington Starr has partnered up with a Global Exchange company that are looking to hire a UI Developer with expert Software Engineering skills using JavaScript, React/Redux … Senior Developer to come work on a Greenfield Project working on Exchange and connectivity services. . As the UI Developer, you will have extensive experience of working with the JavaScript Framework including ES7 and HTML and CSS. You will be working directly with Portfolio Managers and end users where you will be responsible for specing out, designing and developing of … UI screens for the users. This will require you to have client facing experience as well as low levy programming with JavaScript and React Development experience. Their systems cover all asset classes from FX, Fixed Income, Interest Rates and Commodities including derivative products although this knowledge is not essential but would be advantageous. Key Tech Stack: Extensive React/Redux More ❯

TypeScript/JavaScript - Software Engineer Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, React, NextJS, TypeScript, Cloud Tech, Terraform, AWS. Harrington Starr has partnered with an innovative Digital Currency Investment Platform Company that specialise in developing unique software systems for clients for invest into Digital Markets from Pensions, Investments and Fund Management. This is an exciting opportunity to join … are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced TypeScript Software Engineer with NodeJS, JavaScript, TypeScript and NodeJS and including cloud technologies mainly AWS and Terraform You will have a degree in computer science from a reputable University and have a good understanding of JavaScript … TypeScript. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript and TypeScript Experience with TypeScript Experience with AWS Cloud Technologies Experience with Terraform Experience with Trading Systems and Front Office Trading environment Any experience with Digital Investments. A 2:1 or above in Computer Science - Required A leader within their community and a specialist More ❯

Trading Systems UI Developer Salary: Up to £120,000 plus Bonus and Benefits NodeJS, JavaScript, TypeScript, React Framework, Trading Systems UI, Data Structures, High Frequency Trading, Tailwind, CSS, React Query, API, High performance UI Harrington Starr has partnered with an innovative Digital Currency Investment Platform Company that specialise in developing unique software systems for clients for invest into Digital Markets … from Pensions, Investments and Fund Management. This is an exciting opportunity to join a small team within a large organisation and get the experience to utilise the JavaScript ecosystem. This organisation are developing cutting edge web-systems, which are being used globally and are offering the opportunity for you to play a pivotal role within the full software development life … cycle. We are looking for an experienced Trading Systems UI Developer with NodeJS, JavaScript, TypeScript and NodeJS and including cloud technologies. You will have a degree in computer science from a reputable University and have a good understanding of JavaScript TypeScript and React Framework. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript and More ❯

Senior WordPress Developer – PHP - JavaScript - React Predominately remote with occasional visits to London (circa 1 per day month) Circa £90,000 + benefits Permanent A skilled Senior WordPress Developer is sought to join a development team working in a fast paced, high traffic environment. Looking for strong WordPress and all-round engineering experience within enterprise level environments. Such as web … architecture, custom RSS feeds, WordPress VIP and full stack web development including JavaScript and React. Must be willing to complete a technical task to determine suitability. Responsibilities/Skills Develop and maintain features for a large-scale WordPress website Contribute to shared WordPress plugins and microservices Create and maintain custom Gutenberg blocks, API endpoints, and front-end components Optimise performance … cross-functional teams to drive scalable, maintainable codebases Work autonomously, managing workload and priorities in a remote-friendly setting Extensive hands-on WordPress development experience Strong knowledge of PHP, JavaScript, React, and Gutenberg Experience with custom blocks, RSS feeds, and JSON APIs Solid understanding of front-end performance and web standards Familiar with Git and version control principles Experience working More ❯

will collaborate with clients, develop Service Portal components, and integrate them with various systems. Key Responsibilities: Develop and customize ServiceNow Service Portal pages, widgets, and components using HTML, CSS, JavaScript, and ServiceNow scripting. Extend portal functionality with ServiceNow APIs and integrations. Ensure responsive, user-friendly design and best practices. Work with cross-functional teams to integrate the portal with ServiceNow … support end users. Contribute to best practices, innovation, and technical problem-solving. Required Skills & Experience: Hands-on experience in ServiceNow Service Portal development. Strong web development skills (HTML, CSS, JavaScript, jQuery). Expertise in ServiceNow development, including scripts, UI policies, workflows, and integrations. Experience with AngularJS or modern JavaScript frameworks. Strong problem-solving, collaboration, and communication skills. Knowledge of Agile More ❯

Node.js Software Developer – Healthcare Startup – London (Tech Stack: JavaScript, Vue.js, React, Node.js, NestJS, REST APIs, Git, Agile Methodologies) Company Overview: Join a mission-driven healthcare startup that’s transforming patient care through cutting-edge digital solutions. We are seeking a talented Software Developer who thrives in dynamic startup environments and wants to build technology that genuinely impacts lives. If you … stand-ups, and agile ceremonies. Stay current with modern development trends and frameworks. Requirements: 4+ years of experience as a Software Developer in a commercial environment. Proven expertise in JavaScript, Vue.js, React, and Node.js. Familiarity with backend frameworks such as Express or NestJS (desirable). Experience working in or strong enthusiasm for startup environments. Solid understanding of modern development practices More ❯

First Point Group is recruiting on for a Senior Full Stack Engineer ( Vue, Python 3, JavaScript and SQL) on behalf of an expanding, mission-driven technology company focused on creating products (incorporating Internet of Things) that reduces carbon emissions through Hardware and Software as a Service . If you are passionate about utilising your experience to contribute to creating a … maintains high uptime and performance. Essential Criteria: Full-stack software engineer with a passion for building great software 4+ years of professional development experience Mandatory experience : Vue.js, Python 3, JavaScript, SQL, and Linux Strongly desired : Django or Flask (or other modern Python frameworks) Desirable : React.js, NoSQL databases, Grafana, GitLab, AWS Degree in Computer Science or a related discipline (ideally 1st More ❯

the ability to articulate complex technical concepts to non-technical stakeholders. Flexibility: Expected to be in the office 1-2 days a month. Technical Expectations: Expert-level proficiency in JavaScript, with an in-depth understanding of the JavaScript module system, including extensive knowledge of CommonJS and ES Modules, and how they operate within both Node.js and browser environments. Extensive experience … application performance, specifically focused on frontend and SSR performance improvements through effective use of code-splitting, hydration strategies, caching, and state management solutions. Familiarity and practical experience with current JavaScript language features (ES2020+) and tooling ecosystems (Babel, TypeScript). Proven ability to guide technical decision-making, mentor engineering teams, conduct rigorous code reviews, and uphold high standards for code quality More ❯

you happy to work "high-side", on-site 5 days/week? And... do you have experience with a few of the following technologies?: Java Kotlin Python Kubernetes AWS JavaScript React Node.js ✅✅✅... let's chat! Salary: £55,000 - £80,000 + benefits. Start dates: Anytime in the coming 6 months Interview process: 2-stage virtual Please apply directly or More ❯

frontend interfaces, with plenty of room to shape both the technical direction and the product itself. What You’ll Bring: Strong experience across the stack - ideally Python and modern JavaScript/TypeScript (Vue/React/Next/Angular) frameworks. 2+ years of relevant professional experience Experience shipping production systems and collaborating in agile, product-led teams A good sense More ❯

get to work across the stack, own critical systems, and help steer the tech roadmap as the company scales big time. Tech you’ll use: React, Docker, TypeScript, Node, JavaScript AWS (EC2, Lambda, S3, CloudWatch) AI (nice-to-have) Testing frameworks like Jest, Mocha CI/CD pipelines What’s in it for you? Solid salary package: £50K–£60K (depending More ❯

modules according to specifications in .NET (ASP.NET & C#). In depth Experience in ASP.NET, Version 3.1 or higher, .NET core and full stack. Substantial experience with IIS, HTML 5.0, JavaScript, CSS 3.0, Ajax, React Js. Basic Knowledge of Oracle and MS SQL Server. Experience working with Agile development methodologies. Strong testing and debugging skills. Excellent communications skills. Must have the More ❯

Copilot to speed up development Deploy with Vercel, Fly.io, or GitHub Actions Join product brainstorms and actually influence the roadmap ✅ Must-haves: Proven experience of LLM Products-essential Solid JavaScript/TypeScript and React fundamentals Back-end experience in Node or Python Comfortable using AI dev tools and debugging APIs Basic CI/CD know-how and real-world Git More ❯

and you will get the opportunity to lead a small globally dispersed team. Ideal skills: Full stack engineering, with good back-end and front-end experience Python, C++ React, JavaScript Trading/Front office trading exposure Real time streaming data Data at speed, similar to Market Data technology Linux operating systems Strategy experience Computer Science degree/education or similar More ❯

and demos What You’ll Need: 2+ years’ experience in software QA, both manual and automated Strong skills in Selenium, Cypress, Playwright, or similar Scripting knowledge (Java, Python, or JavaScript) Familiarity with performance testing (e.g., JMeter, LoadRunner) CI/CD experience with Jenkins, GitLab CI, or Azure DevOps Solid understanding of databases (Oracle/MySQL) and Linux systems Strong communication More ❯