2,526 to 2,550 of 2,749 JavaScript Jobs

performance. Key Responsibilities: Lead performance testing strategy, planning, and execution using k6 (both open-source and cloud versions Design and develop robust, reusable, and parameterized performance test scripts in JavaScript (k6 scripting Simulate high-load scenarios, stress tests, and soak tests for APIs, web applications, and microservices. Analyze test results to identify bottlenecks and performance issues across front-end, backend … stakeholders. Required Skills and Qualifications: 7+ years of experience in performance testing and engineering. Strong hands-on experience with k6 including scripting, scenario modeling, and result interpretation. Proficient in JavaScript for writing k6 test scripts. Experience with Grafana, Prometheus, InfluxDB, or other APM tools for monitoring and metrics. Good understanding of HTTP, REST, WebSockets, and microservices architectures. Solid knowledge of More ❯

looking to build Enterprise software for globally recognised business that offers stability and great benefits. The Role: Developing new features across the full stack (C#, .NET, WebAPI/REST, JavaScript and SQL) Building responsive UI's with an Knockout.JS See through the full product lifecycle Progression opportunities to senior positions and tailored development plans Working in a Swansea based office … C# and MVVM Framework knowledge Commutable to Swansea Job Reference: BBBH22403a Software, Dev, Developer, Vue, Knockout, SAAS, .NET, Framework, C#. Frontend, Backend, End, Stack, Full, UI, Design, MVVM, React, JavaScript, Swansea, Wales, Nailsea If you are interested in this role, click 'apply now' to forward an up-to-date copy of your CV. We are an equal opportunities employer and More ❯

improvement across the wider Digital Services team.Key Responsibilities:- Design, build and maintain scalable solutions within Salesforce Marketing Cloud.- Develop and enhance platform features using technologies such as AmpScript, SQL, JavaScript, HTML and API integrations.- Lead coding standards, testing approaches and quality assurance practices to ensure robust and maintainable solutions.- Collaborate with colleagues across technology, data, and marketing to translate user … shared learning and best practice.Candidate ProfileEssential Experience & Skills:- Strong hands-on experience developing within Salesforce Marketing Cloud.- Proficiency in programming and scripting relevant to the platform (e.g., AmpScript, SQL, JavaScript, HTML/CSS).- Demonstrated ability to design and implement integrations and data flows.- Understanding of software design principles, testing methods and secure coding practices.- Ability to analyse requirements and More ❯

across the wider Digital Services team. Key Responsibilities: - Design, build and maintain scalable solutions within Salesforce Marketing Cloud. - Develop and enhance platform features using technologies such as AmpScript, SQL, JavaScript, HTML and API integrations. - Lead coding standards, testing approaches and quality assurance practices to ensure robust and maintainable solutions. - Collaborate with colleagues across technology, data, and marketing to translate user … and best practice. Candidate Profile Essential Experience & Skills: - Strong hands-on experience developing within Salesforce Marketing Cloud. - Proficiency in programming and scripting relevant to the platform (e.g., AmpScript, SQL, JavaScript, HTML/CSS). - Demonstrated ability to design and implement integrations and data flows. - Understanding of software design principles, testing methods and secure coding practices. - Ability to analyse requirements and More ❯

open-source technologies to create scalable, high-performance applications that power real-time solutions. Hands-On Development - Work on new projects from the ground up, using technologies like Java, JavaScript, JQuery and SQL. Team Collaboration - Join a supportive and skilled team where you can build your expertise and contribute to meaningful projects. Role Responsibilities: Develop, test, and maintain software applications … Most Remote working. To apply, click apply now or send your CV to Matthew.Leach @ circlerecruitment.com Keywords: Software Developer/Java/SQL/Linux/Spring/jQuery/JavaScript/Warrington/Manchester/Liverpool/Preston Circle Recruitment is acting as an Employment Agency in relation to this vacancy. Earn yourself a referral bonus if you refer somebody More ❯

for resolution Ensure test environments are maintained and reflective of production settings Advocate for and implement shift-left and test-first practices Collaborate with developers working in Java and JavaScript to ensure test coverage and code quality Contribute to defining and evolving quality assurance standards and practices across the team Ensure testing processes meet compliance and governance standards relevant to … sponsor) Proven experience as a Test Engineer or QA in agile delivery environments Strong automation testing experience (not just manual testing) Experience working with development teams using Java or JavaScript Familiarity with integrating test automation into CI/CD pipelines (e.g., GitLab CI, Jenkins, GitHub Actions) Experience with non-functional testing , including: Performance testing (e.g., JMeter, Gatling), Security testing (e.g. More ❯

Senior DevOps Architect Remote Office Our team embraces a core set of values that drive our business: integrity, customer focus, value creation, respect, innovation, and teamwork. Our security, technology and information management and governance professionals are passionate about their work More ❯

AI Software Developer (Python, JavaScript, ML) - London/Hybrid Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months Start: ASAP Hybrid: 3 days on site per week My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and … AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams … input on sprint planning, task estimation, and iterative improvements Requirements: 3+ years of experience in software development, with exposure to AI or machine learning projects. Proficient in Python and JavaScript, ideally with hands-on experience in building Gen AI proof of concepts or integrating LLM APIs. Familiarity with AI platforms such as OpenAI, Anthropic, or Databricks. Strong understanding of AI More ❯

alongside a small, highly skilled team of software and web developers. You will have the opportunity to utilise your expertise in Front End development Ideal Skills React Native Modern JavaScript frameworks Core frontend technologies - JavaScript/TypeScript/HTML/CSS Relational databases - MySQL/Postgres Strong problem-solving skills Strong communication skills Desire to learn and advance yourself and More ❯

WordPress/PHP Developer £60,000 - £70,000 Hybrid - 3 days a week, central London (WordPress, PHP, JavaScript,) Would you like the opportunity to work with one of the leading worldwide SaaS organisation, working with WordPress, PHP and JavaScript? The Company A market leading SaaS company with a global presence, with high-end offices in central London You will be … work in the office three times a week with the rest of the team. Requirements: Strong WordPress/PHP experience - any framework (Symfony, Laravel, Zend, etc) Strong knowledge of JavaScript - (React, Vue.JS, Angular, etc) HTML/CSS Understanding of TDD and Gutenberg would be a bonus Experience of working in an agile environment This role requires you to work from … WordPress/PHP developer, this is a unique opportunity to join a market leading company with the added bonus of continuing to grow your skillset in PHP, WordPress and JavaScript, with an outstanding benefits package on offer. More ❯

PHP Developer £60,000 - £70,000 Hybrid - 3 days a week, central London (WordPress, PHP, JavaScript,) Would you like the opportunity to work with one of the leading worldwide SaaS organisation, working with WordPress, PHP and JavaScript? The Company A market leading SaaS company with a global presence, with high-end offices in central London You will be joining an … a week with the rest of the team. Requirements: Strong PHP experience - any framework (Symfony, Laravel, Zend, etc) Have experience/interest in working with WordPress Strong knowledge of JavaScript - (React, Vue.JS, Angular, etc) HTML/CSS Understanding of TDD and Gutenberg would be a bonus Experience of working in an agile environment This role requires you to work from … As a PHP developer, this is a unique opportunity to join a market leading company with the added bonus of continuing to grow your skillset in PHP, WordPress and JavaScript, with an outstanding benefits package on offer. More ❯

PHP Developer £60,000 - £70,000 Hybrid - 3 days a week, central London (WordPress, PHP, JavaScript,) Would you like the opportunity to work with one of the leading worldwide SaaS organisation, working with WordPress, PHP and JavaScript? The Company A market leading SaaS company with a global presence, with high-end offices in central London You will be joining an … a week with the rest of the team. Requirements: Strong PHP experience - any framework (Symfony, Laravel, Zend, etc) Have experience/interest in working with WordPress Strong knowledge of JavaScript - (React, Vue.JS, Angular, etc) HTML/CSS Understanding of TDD and Gutenberg would be a bonus Experience of working in an agile environment This role requires you to work from … As a PHP developer, this is a unique opportunity to join a market leading company with the added bonus of continuing to grow your skillset in PHP, WordPress and JavaScript, with an outstanding benefits package on offer. More ❯

Designing, developing, and maintaining both front-end and back-end components of web and mobile applications using JavaScript, Node.js, and modern frameworks and libraries, with strong Angular JS , and others such as React, or Vue.js. Full Stack JavaScript Developer Salary: £70,000 to £80,000 pa (depending on experience) plus benefits, perks and health-care options Location: Hybrid/ 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 ❯

Python Software Engineer Location: MaidstoneSalary: £55,000 - £65,000 Python - Typescript - JavaScript - GIT - Network Security - Overview We're seeking a talented Software Engineer to join a leading engineering company based in Kent. This is an excellent opportunity for a technically minded developer who enjoys working across both software and hardware systems, contributing to innovative solutions in the energy and engineering … . Excellent problem-solving and debugging skills. Experience with embedded systems or hardware interaction would be highly beneficial. Technical Skills Knowledge and experience in the following languages: Python (essential) JavaScript TypeScript Familiarity with other programming languages, frameworks, or modern development tools would be advantageous. Python Software Engineer Location: MaidstoneSalary: £55,000 - £65,000 Python - Typescript - JavaScript - GIT - Network Security More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯

someone who has: 2-3+ years of experience working in a web development agency or in-house for a brand Experience developing Shopify themes Strong knowledge of modern JavaScript Ability to write well-structured, semantic, and accessible HTML Confidence writing framework-agnostic, performance-focused JavaScript Awareness of WCAG accessibility guidelines Solid understanding of front-end performance best practices Strong More ❯