26 to 50 of 92 JavaScript Jobs in the City of London

evolving well-structured RESTful APIs Designing and improving data models across relational (e.g. PostgreSQL) and NoSQL databases Working across the stack where needed, including JavaScript, modern HTML/CSS, and utility frameworks such as Tailwind Contributing to cloud-based infrastructure (e.g. Google Cloud), deployment pipelines and DevOps practices Debugging live ...

development practices Engage senior stakeholders across technology and business Translate complex technical decisions into clear, commercial outcomes Technology Environment Backend: TypeScript/C# Frontend: JavaScript/React Cloud: AWS (containers, serverless, broader ecosystem) What They're Looking For Strong platform/solution architecture experience in modern cloud environments Background building ...

application architecture and delivery lifecycle Experience with integrations (REST, SOAP, APIs, OAuth, SQL) Good understanding of relational databases (SQL Server or Oracle) Knowledge of JavaScript and CSS for UI customisation Understanding of application security, performance tuning, and scalable design principles Desirable Experience OutSystems certifications (Associate, Professional, Tech Lead) Exposure ...

design Write well-tested, maintainable code with a strong focus on correctness and usability Core Technical Requirements Strong professional experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, state management, and component design Experience handling large, dynamic data sets in the browser Strong grasp ...

business scales toward Series A and beyond. Core requirements: 3 plus years of engineering experience Strong in React and comfortable across the full JavaScript and TypeScript stack Backend experience building REST APIs using NestJS or Express Or Python Experience with MongoDB or similar databases Evidence of building independently, for example ...

specific risks • Provide hands-on guidance during security incidents Requirements Technical Expertise • 5+ years in application/product security roles • Strong coding skills (Python, JavaScript/TypeScript, Golang) • Deep knowledge of vulnerabilities across web and mobile environments • Hands-on experience with modern frameworks (React, Angular, ReactNative, Flutter) • Experience with security ...

strong eye for frontend quality - you care about how things look and feel, not just whether they work Comfortable working with HTML, CSS, and JavaScript across a modern Rails frontend stack Familiarity with relational databases (PostgreSQL preferred) and writing efficient queries Comfortable building and consuming APIs as part of delivering ...

here At least 2 years working with AI or ML systems in production and 3–5 years of substantive software/platform engineering Deep JavaScript/Node.js skills Azure Fluency JSON data structures, REST API design, and complex semi-structured data Practical LLM application — RAG architectures, prompt engineering etc Comfort ...

from business problem → solution design → development → release. Debug issues, improve reliability, and raise code quality. Work pragmatically across the stack (Ruby, JavaScript, CSS, SQL). Use AI-assisted/agentic development tools to write and review code, while maintaining high quality. Must haves Strong Ruby and Ruby on Rails experience ...

solutions. Requirements: The ideal candidate will have several years' experience in ServiceNow design and development preferably in a consulting environment. Scripting skills such as JavaScript, HTML and XHTML, XML, CSS, AJAX, AngularJS highly advantageous An understanding of Service Management concepts, delivery assurance principals and procedures. A high level of knowledge ...

rich platforms. Proven ability to lead or influence front-end architecture and technical decisions on large-scale websites. Strong expertise in HTML5, CSS, and JavaScript, with deep knowledge of responsive design, performance optimisation, and accessibility best practices. Experience designing and delivering A/B or MVT experiments, ideally using Dynamic ...

external data sources Knowledge of Power Automate for workflow automation Understanding of security models and access control within Power Platform Familiarity with HTML, CSS, JavaScript for customisation of Power Pages Experience working in financial services or asset management (preferred) Salary: £80k - £100k + Bonus + Benefits Hybrid: 3 days ...

technologies relevant to the ServiceNow integration solutions including: Integration Hub, SSO, Web Services, LDAP, JDBC, etc. Experience in scripting on the ServiceNow platform using JavaScript, CSS and Angular JS: Flows, Business Rules, Client Scripts, UI Actions, Widgets and UI Pages Ability to author clear and comprehensive documentation ...

Collaborating with senior engineers on a highly integrated visual system Optionally contributing to technical content, demos, or talks What they’re looking for Strong JavaScript or TypeScript fundamentals Experience working with Canvas, SVG, or other 2D graphics systems Solid grounding in algorithms, data structures, and software design Experience building complex ...

scales Helping to raise the bar on engineering practice: testing, code reviews, documentation, technical direction What they're looking for Strong commercial TypeScript/JavaScript experience, you've shipped real products, not just prototypes Comfortable across the full stack; React and Node experience preferred Genuinely product-minded, you think about ...

trust team to ship and iterate quickly. Core Technology Stack: Backend: Java, distributed messaging systems, relational databases, Docker, infrastructure as code Frontend: TypeScript, modern JavaScript frameworks Infrastructure: Cloud-native serverless and containerised environments AI Tooling: Regular use of AI-powered development tools and coding assistants What We’re Looking ...

Extensive SAP UI5/Fiori development experience or as SAP UX Architect that can lead SAP FIori developers Strong skills in UI5, Fiori, JavaScript, HTML5, CSS, XML, debugging tools Hands-on development with CDS Views (including UI annotations) Experience with OData services (SAP Gateway), BOPF, RAP framework Good understanding ...

WILL NEED The foremost quality for this position or any position at Blockchain.com is integrity. At least 2 years of experience working with JavaScript and client-side web applications preferred. Experience building innovative data visualizations. You thrive on learning new technologies and don’t believe in one-size-fits ...

Specialist in at least one ServiceNow product suite ITIL Foundation certification (v3 or v4) Strong hands-on experience with ServiceNow scripting and configuration, including JavaScript, CSS, AngularJS, Flows, Business Rules, Client Scripts, UI Actions, Widgets, and UI Pages A solid understanding of ServiceNow integrations , including Integration Hub, SSO, Web Services ...

Position: Front End JavaScript Developer Reports to: Front End Development Team Lead Hours: 40 hours Location: 3 days in North London office (Monday – Wednesday) Salary: £60 - £80,000 + eligibility for performance bonus Start date: ASAP Purpose of the role: As a Front End Developer you will join … highest standards of code quality in alignment with company-wide conventions. Required skills: · Minimum of 4 years of hands-on experience with Javascript working mainly on Frontend solutions · Solid grasp of JavaScript(Vanilla Javascript) fundamentals , including understanding of the Document Object Model (DOM) and browser Application Programming Interfaces (APIs). ...

modules and Power Apps Portal - Code review and Enhancements - Technical and functional design reviews - Lead a team of developers - Experience working/developing JavaScript, Plugins - Strong understanding of application lifecycle management - Superb collaboration, interpersonal, and communication skills - Advanced analytical and problem-solving abilities - Solution Deployment ...

PostgreSQL Cloud: Azure (with some GCP) What they’re looking for Experience building full-stack applications in a production environment Strong skills with modern JavaScript frameworks (ideally Vue or similar) Backend experience with Python (or similar languages) A product mindset and interest in building tools that deliver real user value ...

cross-functionally in a product-driven squad model Requirements: Strong experience with React Native (non-Expo, production-level apps) Solid fundamentals in React & modern JavaScript (ES6+) Experience integrating GraphQL/REST APIs Strong understanding of mobile performance, debugging, and lifecycle Background in fintech, payments, or data-sensitive applications Ability ...

tools (Tableau, Looker, PowerBI, Omni etc.) Familiarity with cloud infrastructure (GCP preferred) Experience working in Financial Services or consulting Google Apps Script/Javascript Working in small, fast-paced and scaling environments Please note : unfortunately, this role does not offer VISA sponsorship. ...

design end‐to‐end solutions that integrate with a range of legacy and modern systems. Proficiency with programming and scripting languages such as JavaScript, SQL, Java, C#, or similar. Skilled at simplifying complex technical concepts for non‐technical audiences and influencing decision‐making. Minimum five years’ experience in a technical ...