326 to 350 of 392 JavaScript Jobs in the City of London

Python Developer - Python, Django, REST API's, AWS, JavaScript OB are partnered with a Global Financial Services company, who are looking to add a highly skilled Python Developer to their team. In this role, you'll be working their Python backend systems, developing new features and collaborating with different teams, to ensure product goals are met. Python Developer - Python, Django … REST API's, AWS, JavaScript Key Skills and Experience: Strong knowledge of Python Experience with Python frameworks (Django preferred) PostgreSQL REST API'S Docker Cloud experience (AWS preferred) Knowledge of Frontend Technologies (JavaScript, HTML, CSS) This is a hybrid role with 2-3 days a week required in a London based office Base salary of £75k-£90k depending on skills … and experience To be considered, you must be UK based Python Developer - Python, Django, REST API's, AWS, JavaScript More ❯

Principal JavaScript Performance 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. A high-growth software company is building the gold standard in UI frameworks and data-intensive visualisation technology . With millions … complexity that ordinary web development never touches. What you’ll do Design and optimise a high-performance UI framework used globally in real-time applications. Push the limits of JavaScript, TypeScript, and the browser runtime to handle millions of data points smoothly. Solve deep algorithmic and architectural challenges in rendering, scalability, and memory efficiency. Own features end-to-end: design … code, test, release, and iterate. Contribute to a product used by developers and enterprises worldwide. What you’ll bring Mastery of vanilla JavaScript and TypeScript , with additional exposure to C++, Java, or C# . Strong knowledge of data structures, algorithms, and performance optimisation . Experience with frameworks like React, Angular, or Vue , and a deep understanding of DOM internals and More ❯

Principal JavaScript Performance 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. A high-growth software company is building the gold standard in UI frameworks and data-intensive visualisation technology . With millions … complexity that ordinary web development never touches. What you’ll do Design and optimise a high-performance UI framework used globally in real-time applications. Push the limits of JavaScript, TypeScript, and the browser runtime to handle millions of data points smoothly. Solve deep algorithmic and architectural challenges in rendering, scalability, and memory efficiency. Own features end-to-end: design … code, test, release, and iterate. Contribute to a product used by developers and enterprises worldwide. What you’ll bring Mastery of vanilla JavaScript and TypeScript , with additional exposure to C++, Java, or C# . Strong knowledge of data structures, algorithms, and performance optimisation . Experience with frameworks like React, Angular, or Vue , and a deep understanding of DOM internals and More ❯

We're looking for a Senior-level Software Engineer with strong JavaScript/TypeScript skills and experience across modern web stacks. You'll be instrumental in our transition away from Drupal as we modernise and scale our platform. Tech Stack: At least 4 years commercial experience with JavaScript or TypeScript and Node Exposure of Laravel and/or Python (Django More ❯

exploration with incredible savings. They are currently looking for a Senior Engineering Manager to lead their existing team (circa 15), made up of passionate and like-minded Full stack JavaScript Engineers. As the Senior Engineering Manager you'll play a pivotal role in driving innovation, leading and ensuring the scalability of their product. You will play a key part in … level, whilst remaining close to the code and has a passion for this! What we expect from the Senior Engineering Manager: • 10+ years experience in software engineering - All things JavaScript, TypeScript + Java • 3+ years experience as an engineering manager - proven people/technical leadership experience. • Proven experience in system architecture design, including scalable, reliable and performant solutions. • Experience scaling More ❯

exploration with incredible savings. They are currently looking for a Senior Engineering Manager to lead their existing team (circa 15), made up of passionate and like-minded Full stack JavaScript Engineers. As the Senior Engineering Manager you'll play a pivotal role in driving innovation, leading and ensuring the scalability of their product. You will play a key part in … level, whilst remaining close to the code and has a passion for this! What we expect from the Senior Engineering Manager: • 10+ years experience in software engineering - All things JavaScript, TypeScript + Java • 3+ years experience as an engineering manager - proven people/technical leadership experience. • Proven experience in system architecture design, including scalable, reliable and performant solutions. • Experience scaling More ❯

facing and internal problems that drive value. Champion security, observability, and reliability best practices. Mentor teammates and help cultivate a healthy, innovative engineering culture. Tech Stack: Core: TypeScript/JavaScript (server-side) Cloud & Infra: AWS (cloud-based architectures), Docker, CI/CD; IaC such as Terraform or CloudFormation Quality & Ops: Security and observability tooling/best practices Bonus exposure: React … on the front end (nice to have) What we’re looking for We value skill and impact over strict year counts. You should have: Strong TypeScript/JavaScript fundamentals and experience building high-traffic server-side web applications. Solid understanding of cloud-based application architecture (preferably AWS). Hands-on experience with Docker and CI/CD tooling. Practical grasp More ❯

facing and internal problems that drive value. Champion security, observability, and reliability best practices. Mentor teammates and help cultivate a healthy, innovative engineering culture. Tech Stack: Core: TypeScript/JavaScript (server-side) Cloud & Infra: AWS (cloud-based architectures), Docker, CI/CD; IaC such as Terraform or CloudFormation Quality & Ops: Security and observability tooling/best practices Bonus exposure: React … on the front end (nice to have) What we’re looking for We value skill and impact over strict year counts. You should have: Strong TypeScript/JavaScript fundamentals and experience building high-traffic server-side web applications. Solid understanding of cloud-based application architecture (preferably AWS). Hands-on experience with Docker and CI/CD tooling. Practical grasp More ❯

continuous improvement WHAT YOU’LL BRING Strong experience with Service Fabric and Kubernetes Proven experience architecting and scaling B2B SaaS platforms Strong full-stack technical expertise – especially across C#, JavaScript, and React Experience integrating with APIs and identity platforms (e.g. Microsoft Entra ID/Azure AD) Solid understanding of cloud infrastructure – ideally Azure and Service Fabric A collaborative mindset – comfortable … product, engineering, and client delivery A pragmatic, hands-on approach to problem-solving and decision-making Background in IAM or SSO is a bonus OUR TECH STACK Frontend: React, JavaScript Backend: C#, .Net, Azure Service Fabric Infrastructure: Azure, Service Fabric, Cosmos DB WHY COCENTRIC Be a key part of a product that’s transforming how the frontline workforce connects Help More ❯

continuous improvement WHAT YOU’LL BRING Strong experience with Service Fabric and Kubernetes Proven experience architecting and scaling B2B SaaS platforms Strong full-stack technical expertise – especially across C#, JavaScript, and React Experience integrating with APIs and identity platforms (e.g. Microsoft Entra ID/Azure AD) Solid understanding of cloud infrastructure – ideally Azure and Service Fabric A collaborative mindset – comfortable … product, engineering, and client delivery A pragmatic, hands-on approach to problem-solving and decision-making Background in IAM or SSO is a bonus OUR TECH STACK Frontend: React, JavaScript Backend: C#, .Net, Azure Service Fabric Infrastructure: Azure, Service Fabric, Cosmos DB WHY COCENTRIC Be a key part of a product that’s transforming how the frontline workforce connects Help More ❯

UK As a senior software engineer, own understanding of business problems, design, implementation and release of critical features across our stack Design and develop scalable, efficient solutions primarily using JavaScript/TypeScript and AWS technologies, but be prepared to work with a variety of other languages and tools as needed Be comfortable switching between frontend, backend, devops, and data engineering … from you if you have: You have 5+ years of professional experience in software development, with a proven track record of delivering impactful projects You're highly proficient in JavaScript and TypeScript, with extensive experience in AWS services (e.g., Lambda, Step functions, AppRunner, ECS). You have experience with data processing techniques, working with large datasets and are confident using More ❯

We’re looking for a Mid-level Full-Stack Laravel Developer to join our clients technology team building cutting-edge video streaming platforms used by some of the biggest names in media, sport, and entertainment. This is an opportunity to More ❯

We’re looking for a Mid-level Full-Stack Laravel Developer to join our clients technology team building cutting-edge video streaming platforms used by some of the biggest names in media, sport, and entertainment. This is an opportunity to More ❯

Graduate/Junior Developer, Python, JavaScript, PHP - London (Tech stack: Graduate/Junior Developer, Python, JavaScript, PHP, Graduate/Junior Developer) In 2012 our client launched a social messaging platform that has been taking the US by storm. After an extremely successful period our client has decided to hop across the Atlantic, in a bid to expand their sphere of … successful company! These roles would be suitable Graduate/Junior Developer who have recently graduated from university and have a basic understanding of any of the following technologies: Python, JavaScript, PHP, React, React Native, Django, Postgres, Docker and Agile; which might have been acquired as part of your degree course or through a placement year in industry. All Graduate/ More ❯

JavaScript Full-Stack Engineer - Climate-Tech Start-Up - Fully Remote JavaScript Full-Stack Engineer required for a fully remote role in a well-backed Climate-Tech team, you will be looking to join a positive impact business with an exceptional JavaScript/React/Next.js engineering team where you can progress your software engineering career in a forward-thinking organisation. …/Azure/GCP), DevOps and data/ML workflows Happy to liaise with clients If you can see yourself in a mission-led, impact-focused team, apply now! JavaScript Full-Stack Engineer - Climate-Tech Start-Up - Fully Remote More ❯

is required and relevant for many entry level programming roles and help you get a step ahead. Learn the Command Line (*1.5 weeks) Learn Git & GitHub (*1.5 weeks) Learn JavaScript (*1.5 weeks) Learn Python 3 (*1.5 weeks) JavaScript forms the foundation of almost everything you see on the Internet. Therefore, this is an essential addition language in building your programming More ❯

is required and relevant for many entry level programming roles and help you get a step ahead. Learn the Command Line (*1.5 weeks) Learn Git & GitHub (*1.5 weeks) Learn JavaScript (*1.5 weeks) Learn Python 3 (*1.5 weeks) JavaScript forms the foundation of almost everything you see on the Internet. Therefore, this is an essential addition language in building your programming More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

Trading UI Engineer – Front Office JavaScript, React, typescript, NodeJS, Tailwind, GraphQL, ApolloQL, Webpack, Cypress, HTML, CSS, REST, Data Visualisation, API. Real Time Trading Software, UI Development Perm Role – London – Onsite. £80000 - £100000 plus bonus Harrington Starr has partnered up with a Global Investment Bank in the City of London who are looking to hire a Senior UI Trading Software Developer … high profile role for a Multi Asset Trading Team within a Front Office environment. As the Senior Trading 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, Sales Traders and Quants 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. The application is More ❯

Trading UI Engineer – Front Office JavaScript, React, typescript, NodeJS, Tailwind, GraphQL, ApolloQL, Webpack, Cypress, HTML, CSS, REST, Data Visualisation, API. Real Time Trading Software, UI Development Perm Role – London – Onsite. £80000 - £100000 plus bonus Harrington Starr has partnered up with a Global Investment Bank in the City of London who are looking to hire a Senior UI Trading Software Developer … high profile role for a Multi Asset Trading Team within a Front Office environment. As the Senior Trading 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, Sales Traders and Quants 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. The application is More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

are looking for an additional Senior WordPress engineer to join the team. The Role Maintain and develop new WordPress features Build and maintain plugins Work on maintain microservices and JavaScript elements of the stack which work alongside WordPress Prioritise your work load and lease with colleagues in other teams to ensure collaboration Ability to work within a fast paced environment … Requirements Extensive experience with WordPress Strong knowledge of Gutenberg and best practices Ability to create custom Gutenberg blocks Knowledge of PHP, HTML and CSS Front End development experience in JavaScript and React Knowledge of VCS and Git Ability to communicate your ways of working and collaborate with team members As a WordPress developer, this is a unique opportunity to join More ❯

functional teams, managing code reviews, and taking ownership of delivering clean, efficient, and scalable code. Key Responsibilities Develop and maintain high-quality websites and web applications using HTML, CSS, JavaScript, and PHP Build and enhance custom WordPress themes and plugins Lead development on key features, including Gutenberg blocks for high-profile clients Manage and review pull requests to maintain code … estimate time and assign sprint points Support QA testing and deployments to production Ensure cross-browser and device compatibility, accessibility, and performance Skills & Experience Strong knowledge of HTML, CSS, JavaScript, and PHP Experience with Next.js and WordPress Familiarity with modern testing tools such as Jest, React Testing Library, Cypress, and Playwright Proficient with Tailwind, Bootstrap, and responsive design principles Experience More ❯