javascript developer

Opus Recruitment Solutions

<div>
 
 Node.js Developer (Full Stack)
 
 
 Location: London
 
 
 Security Clearance:
 
 Must hold active DV Clearance
 
 
 
 Employment Type: Contract (flexible)
 
 
 Duration: 6 Months
 
 
 
 
 
 
 Overview
 
 
 
 We are seeking an experienced DV Cleared Node.js Developer to join a high-performing engineering team working on secure, mission-critical systems. This is a fantastic opportunity to contribute to complex projects within a highly secure environment, using modern technologies across both backend and frontend development.
 
 
 You will play a key role in designing, developing, and maintaining scalable applications, working closely with cross-functional teams in an Agile environment.
 
 
 
 
 
 
 Key Responsibilities
 
 
 
 Design, develop, and maintain robust backend services using Node.js
 
 
 Build secure, scalable APIs and microservices architectures
 
 
 Develop responsive and user-friendly frontend components using modern frameworks
 
 
 Collaborate with UX/UI designers to deliver high-quality user experiences
 
 
 Work within Agile / Scrum teams, contributing to sprint planning and delivery
 
 
 Ensure code quality through testing, code reviews, and best practices
 
 
 Maintain and improve system performance, security, and reliability
 
 
 Integrate with third-party systems and internal services
 
 
 Work in highly secure environments adhering to strict compliance requirements
 
 
 
 
 
 
 
 
 
 Required Skills &amp; Experience
 
 
 
 
 Backend
 
 
 
 
 
 
 Strong commercial experience with Node.js (Express.js / NestJS preferred)
 
 
 Experience building RESTful APIs and microservices
 
 
 Good understanding of asynchronous programming and event-driven architecture
 
 
 Familiarity with databases such as MongoDB, PostgreSQL, or similar
 
 
 Knowledge of authentication and security best practices (OAuth, JWT, etc.)
 
 
 
 
 
 
 Frontend
 
 
 
 
 
 
 Solid experience with modern frontend frameworks such as:
 
 
 
 
 
 React, Angular, or Vue.js
 
 
 
 
 
 
 
 
 Strong proficiency in JavaScript / TypeScript
 
 
 Experience with HTML5, CSS3, and responsive design
 
 
 Understanding of UI/UX principles
 
 
 
 
 
 
 General
 
 
 
 
 
 
 Experience with Git and version control workflows
 
 
 Familiarity with CI/CD pipelines and DevOps practices
 
 
 Experience working in Agile environments
 
 
 Strong problem-solving and communication skills
 
 
 
 
 
 Desirable Skills
 
 
 
 
 
 Experience with cloud platforms (AWS, Azure, or GCP)
 
 
 Knowledge of containerisation technologies (Docker, Kubernetes)
 
 
 Familiarity with infrastructure as code (Terraform, CloudFormation)
 
 
 Experience in secure or government environments
 
 
 Understanding of testing frameworks (Jest, Mocha, Cypress)
 
 
 
 
 
 Security Requirements
 
 
 
 
 
 Active DV Clearance is essential
 
 
 (Candidates must currently hold valid clearance to be considered)
 
</div>

Javascript Developer

YO IT Consulting

<div>
 
 Job Title:
 
 Software Engineering
 
 
 
 Job Type:
 
 Contractor (10-12 hours per week)
 
 
 
 Location:
 
 Remote
 
 
 
 Job Summary
 
 
 
 We are looking for experienced software engineers to help train and evaluate next-generation AI systems through real-world software engineering tasks. This role is best suited for developers who can reason through unfamiliar codebases, explain engineering decisions clearly, and solve practical backend, full-stack, systems, or infrastructure-related problems.
 
 
 No prior AI experience is required. What matters most is strong software engineering judgment, clean technical communication, and the ability to evaluate code, architecture, tradeoffs, and implementation quality.
 
 
 
 Key Responsibilities
 
 
 
 <ul>
 <li>
 Work on challenging software engineering tasks across backend, full-stack, infrastructure, and systems-related projects.
 </li>
 <li>
 Review, debug, improve, and explain code across different technical environments.
 </li>
 <li>
 Design or evaluate practical solutions involving APIs, databases, services, integrations, testing, and deployment workflows.
 </li>
 <li>
 Identify tradeoffs around scalability, maintainability, performance, reliability, security, and developer experience.
 </li>
 <li>
 Communicate technical reasoning clearly in writing, including why a solution works and what alternatives were considered.
 </li>
 <li>
 Collaborate with the customer&rsquo;s team on technical reviews, implementation decisions, and problem-solving exercises.
 </li>
 <li>
 Adapt quickly to new codebases, frameworks, and technical requirements.
 
 
 </li>
 </ul>
 
 Required Skills And Qualifications
 
 
 
 <ul>
 <li>
 5+ years of hands-on software engineering experience.
 </li>
 <li>
 Strong experience in at least one backend or full-stack engineering environment, such as Python, JavaScript/TypeScript, Node.js, Java, C#, .NET, C++, Go, Ruby, PHP, or similar.
 </li>
 <li>
 Experience building, maintaining, or reviewing production-level applications, APIs, services, databases, or integrations.
 </li>
 <li>
 Strong understanding of software engineering fundamentals, including debugging, testing, code quality, architecture, and technical tradeoffs.
 </li>
 <li>
 Ability to explain complex engineering decisions clearly and objectively.
 </li>
 <li>
 Comfortable reading and reasoning through unfamiliar code or technical requirements
 
 
 </li>
 </ul>
 
 Preferred Qualifications
 
 
 
 <ul>
 <li>
 Experience with cloud environments such as AWS, GCP, or Azure.
 </li>
 <li>
 Experience with CI/CD pipelines, DevOps workflows, containers, monitoring, or production operations.
 </li>
 <li>
 Experience with frontend frameworks such as React, Next.js, Angular, Vue, or React Native.
 </li>
 <li>
 Open-source contributions, public GitHub work, technical writing, or strong examples of past engineering work.
 </li>
 <li>
 Experience mentoring engineers, reviewing code, or making architecture decisions.
 </li>
 </ul>
</div>

JavaScript/TypeScript Developer - Remote

Eventogy

<div>STRICTLY NO AGENCIES: We are only accepting direct applications for this role. Any unsolicited CVs sent will be treated as a gift and will not be subject to any terms or fees. 
 
RECRUITERS: DO NOT CALL OR EMAIL US REGARDING THESE ROLES 
We are a highly successful UK based Events Management SaaS company looking for an ambitious Next.js Product Developer to help oversee the next phase of development of our suite of products. As an accomplished Front-End Senior Engineer you will have a solid track record of designing highly scalable technology platforms.
We are gearing up for the next stage of our journey and invite you to discuss how we can collaborate whilst supporting your personal growth.
Role Info:
Current Tech Includes: React.js, Next.js (14+), JavaScript, HTML5, CSS3.
Methodologies: Agile/Kanban, TDD/BDD, Continuous Integration and Delivery, AI-assisted development with Cursor &amp; Claude.
Who we are:
With an existing and highly satisfied customer base of very well-known large international blue chip enterprises, we are a secure and dynamically growing Software business with a 20-year history of stability and profit from offices in Farringdon, London. Our client list includes Deutsche Bank, Santander, BNPP, Ford, Kia, Toyota, Linklaters, Clifford Chance, Freshfields etc. 
Front-End Developer Role:
We are seeking a highly skilled and experienced Next.js Developer to join the front-end team and drive forward the rebuild of our platform. If you are enthusiastic about creating high-quality, user-friendly applications and enjoy working in a collaborative environment, we want to hear from you.
While we have highly skilled developers within our teams, your role will be to provide a more holistic view to our product offering. You will be working with our dev team to design efficient and future-proof interfaces, acting as a key driver for the front-end architecture. You will also be expected to leverage AI-assisted development tooling including Cursor and Claude to accelerate delivery, improve code quality, and embed intelligent development practices across the team. 
 
 
Requirements 
You will:<ul><li>Drive forward the development of the frontend of our platform using React.js and Next.js (14+).</li><li>Convert designs and wireframes into high-quality code.</li><li>Optimise applications for maximum speed, scalability, and responsiveness.</li><li>Ensure consistent implementation of brand and design guidelines across all platforms.</li><li>Develop and maintain reusable code and libraries for future use.</li><li>Conduct thorough testing and debugging to ensure the seamless functioning of applications.</li><li>Collaborate with cross-functional teams, including product managers, developers, and stakeholders, to define and implement innovative solutions for the product direction, visuals, and user experience.</li><li>Drive adoption of AI-assisted development practices, including Cursor and Claude, across the engineering team. 
</li></ul>What are the role requirements?
You will have experience with most of the following:<ul><li>A minimum of 5 years of experience as a React.js/Next.js Developer, preferably working on a SaaS product.</li><li>Proficient understanding of web markup, including HTML5, CSS3, and JavaScript.</li><li>Knowledge of code versioning tools, such as Git.</li><li>Excellent problem-solving skills and a keen eye for detail.</li><li>Strong communication and teamwork skills, with the ability to work effectively with cross-functional teams.</li><li>Proficiency using AI coding tools such as Cursor and Claude to write, review, refactor, and document code efficiently.</li></ul> 
Technical Experience:<ul><li>Languages: JavaScript, HTML5, CSS3.</li><li>Frameworks: React.js, Next.js (14+).</li><li>AI Development Tools: Cursor IDE, Claude (Anthropic), prompt engineering for code generation and review.</li></ul> 
Benefits 
We are extremely ambitious, with bold targets designed to place us among the very best in our industry. As part of our team, you'll have access to multiple career progression routes &mdash; from people and leadership roles to product expertise and project management. The direction you take is yours to choose, and we'll be on hand with the guidance and support you need to succeed.We offer a highly collaborative working environment, excellent support for career progression, and a strong commitment to developing our people &mdash; including investment in AI tooling and training. 
Benefits include:<ul><li>Company pension scheme</li><li>Gym membership</li><li>Hybrid working (3 days a week in our Farringdon, London office)</li><li>Vibrant location with a top-quality coffee shop next door and a bustling food market right outside</li></ul>
We are an equal opportunities employer. You must be eligible to work in the UK, hold a valid visa or UK residency, and be currently based in the UK. You must also be prepared to undergo high-level security clearance. 
Salary: &pound;60,000-&pound;70,000
Location: London
NO AGENCIES &ndash; Please do not attempt to canvas from here.</div>

Senior Front-End Developer (React.js/Next.js)

<div>
 
 Freelance: Full‑Stack Developer (Insurance Experience Required)
 
 
 Start Date: 20/07/26
 
 
 Duration: 6 Months (extension highly likely)
 
 
 Location: London (Fully Remote)
 
 
 Capacity: 40 hours per week
 
 
 
 
 
 
 About the Role
 
 
 
 We&rsquo;re looking for an experienced Full‑Stack Developer with Insurance domain expertise to support the development and scaling of a high‑growth digital platform within the insurance sector.
 
 
 You will work across both frontend and backend layers, collaborating closely with product, design, and engineering teams to deliver robust, scalable, and high‑performance solutions.
 
 
 A key focus of the role will be building modern user interfaces (Vue.js) while contributing to backend services, APIs, and architecture that support complex insurance workflows and data models.
 
 
 
 
 
 
 Key Responsibilities
 
 
 
 
 
 
 Design, develop, and maintain full‑stack applications across frontend and backend layers.
 
 
 Build modern, responsive frontend applications using Vue.js.
 
 
 Develop and maintain backend services and APIs to support business logic and integrations.
 
 
 Work with insurance-related systems, data structures, and workflows (e.g. policies, claims, underwriting).
 
 
 Collaborate with product managers, designers, and other developers to deliver high‑quality features.
 
 
 Integrate frontend components with backend services and third‑party APIs.
 
 
 Contribute to architectural decisions across the full technology stack.
 
 
 Identify and resolve performance, scalability, and UI/UX issues.
 
 
 Ensure code quality through best practices, testing, and code reviews.
 
 
 Support the continuous improvement of development processes and system reliability.
 
 
 
 
 
 
 Required Skills
 
 
 
 
 
 
 Strong commercial experience as a Full‑Stack Developer.
 
 
 Proven experience working within the insurance domain (mandatory).
 
 
 Strong frontend expertise with Vue.js (Vue 2 and/or Vue 3). (other frontend technologies feel free to apply)
 
 
 Proficiency in JavaScript and TypeScript.
 
 
 Backend development experience (e.g. Node.js, Java, or similar).
 
 
 Experience designing and consuming RESTful and/or GraphQL APIs.
 
 
 Knowledge of state management (Vuex, Pinia, etc.).
 
 
 Solid understanding of HTML5, CSS3, and responsive design principles.
 
 
 Familiarity with databases (SQL and/or NoSQL).
 
 
 Experience with modern development tools, version control (Git), and CI/CD pipelines.
 
 
 Strong problem-solving skills and ability to work in a distributed team.
 
 
 
 
 
 
 Nice to Have (Not Required)
 
 
 
 
 
 
 Experience with Nuxt.js.
 
 
 Experience with cloud platforms (AWS, GCP, or Azure).
 
 
 Familiarity with insurance platforms or standards (e.g. Guidewire, INSIS, or similar).
 
 
 Exposure to automated testing frameworks (Jest, Cypress, Playwright).
 
 
 Experience working in a fast-paced or scaling environment.
 
 
 Knowledge of microservices architecture or event-driven systems.
 
</div>

Full Stack Engineer

Hunter Bond

<div>
 
 ⚛️ React Engineer &ndash; Leading Buy-Side Investment Firm
 
 
 📍 London (Hybrid)
 
 
 💸 Up to &pound;180,000 + Bonus + Comprehensive Benefits
 
 
 
 
 
 🚀 The Opportunity
 
 
 A prestigious investment firm is seeking a talented React Engineer to help build the next generation of front-end applications supporting trading, pricing, and quantitative research workflows.
 
 
 This is an opportunity to work at the intersection of modern web technology and quantitative finance, developing highly responsive, data-intensive applications that enable real-time decision-making across global markets. You'll collaborate closely with traders, quantitative researchers, and engineers to deliver mission-critical systems in a fast-paced, technology-driven environment.
 
 
 
 
 
 🔧 What You'll Be Doing
 
 <ul>
 <li>
 Design, develop, and maintain high-performance front-end applications using React and modern JavaScript frameworks
 </li>
 <li>
 Build intuitive, data-rich user interfaces for trading, analytics, and pricing platforms
 </li>
 <li>
 Integrate front-end applications with real-time data feeds and backend services
 </li>
 <li>
 Collaborate with engineers, quants, and business stakeholders to deliver scalable, production-grade solutions
 </li>
 <li>
 Contribute to UI architecture, performance optimisation, and overall user experience
 </li>
 </ul>
 
 
 
 
 🌟 Why Join?
 
 
 ⚛️ Build Mission-Critical Applications
 
 
 Develop sophisticated front-end systems that directly support investment and trading decisions.
 
 
 📊 Work with Complex, Real-Time Data
 
 
 Create highly interactive applications capable of handling large volumes of live market data.
 
 
 🧠 Exceptional Colleagues
 
 
 Collaborate with world-class engineers, quantitative researchers, and trading professionals.
 
 
 🚀 Modern Engineering Environment
 
 
 Work with cutting-edge technologies, best practices, and a culture that values technical excellence.
 
 
 💼 Outstanding Compensation &amp; Career Growth
 
 
 Benefit from highly competitive compensation, performance-based bonuses, and a meritocratic environment that rewards impact and innovation.
 
 
 
 
 
 ✅ What We're Looking For
 
 <ul>
 <li>
 Degree in Computer Science, Engineering, Mathematics, or a related STEM discipline
 </li>
 <li>
 1+ years of professional software engineering experience
 </li>
 <li>
 Strong commercial experience with React and modern front-end development
 </li>
 <li>
 Solid understanding of JavaScript/TypeScript, UI architecture, and web application performance
 </li>
 <li>
 Familiarity with Agile development practices, Git, and CI/CD workflows
 </li>
 <li>
 Strong problem-solving skills and attention to detail
 </li>
 </ul>
 
 ➕ Nice to Have
 
 <ul>
 <li>
 Experience with Python or other backend technologies
 </li>
 <li>
 Exposure to financial markets, trading systems, or data-intensive applications
 </li>
 <li>
 Experience working with real-time data visualisation and analytics platforms
 </li>
 </ul>
 
 
 
 
 📩 Interested?
 
 
 If you're looking to apply your front-end expertise to complex, high-impact systems while working alongside some of the industry's brightest minds, we'd love to hear from you.
 
 
 
 
 
 📧 Apply now or reach out directly for a confidential discussion:
 
 obloom@hunterbond.com
 
 
</div>

React Developer - Up to £180,000 + Bonus + Package

Pure Human Resources

<div>Senior Full Stack Developer<div>
England (Remote)
 
Full time, permanent
 
Salary: &pound;55,000 &ndash; &pound;70,000 (DOE)
 
Competitive benefits package</div><div>
Building technology that makes a real difference in healthcare</div><div>
Our client, Holmusk, is a global health technology company transforming behavioural health and chronic disease care through data, digital innovation and evidence-driven medicine.</div><div>
Following continued growth, they are seeking an experienced Senior Full Stack Developer to join their UK team and play a key role in the development of healthcare applications used within Mental Health Trusts across the UK.</div><div>
This is an opportunity to combine technical excellence with meaningful impact, helping to build secure, scalable and compliant software that supports frontline healthcare professionals.</div><div>
Senior Full Stack Developer, the role:</div><div><ul><li>Design, develop and maintain scalable full stack applications using C#/.NET and React
</li><li>Build responsive, high-performance user interfaces using modern JavaScript, HTML and CSS
</li><li>Contribute to architecture decisions, ensuring scalability, maintainability and security
</li><li>Develop and maintain automated testing frameworks across unit, integration and end-to-end testing
</li><li>Drive engineering best practice through code reviews and quality standards
</li><li>Work within a regulated software environment with a strong focus on quality and compliance
</li><li>Collaborate closely with a small, highly skilled development team
</li><li>Support CI/CD pipelines and cloud-based deployment processes
</li><li>Troubleshoot, optimise and improve performance across applications and services
</li><li>Contribute to documentation, traceability and technical governance requirements
</li><li>Support future growth of the engineering team through mentoring and knowledge sharing</li></ul></div><div>
Senior Full Stack Developer, the person:</div><div><ul><li>Strong commercial experience with C# /.NET Core /.NET 6+
</li><li>Strong React.js and modern JavaScript development experience
</li><li>Solid understanding of REST APIs, microservices and distributed systems
</li><li>Experience with design patterns and frameworks such as Entity Framework, MVC, MVVM or CQRS
</li><li>Proven experience implementing automated testing and quality assurance practices
</li><li>Experience with Azure cloud environments
</li><li>Strong knowledge of Git, CI/CD pipelines and DevOps principles
</li><li>Experience working with MS SQL and relational databases
</li><li>Understanding of secure coding principles and data protection requirements
</li><li>Experience using AI tools to improve development efficiency</li></ul></div><div>
Senior Full Stack Developer, the benefits:</div><div><ul><li>Opportunity to shape the development of a software solution that directly supports mental health service delivery
</li><li>Fully remote working
</li><li>Collaborative, flexible and supportive working culture
</li><li>Exposure to innovative healthcare technology at scale
</li><li>Opportunity to work with modern cloud, AI and digital health solutions
</li><li>Generous holiday allowance plus additional company days for national holidays
</li><li>Annual performance-based company bonus
</li><li>Ongoing professional development and career growth opportunities</li></ul></div><div>
Pure Human Resources Limited works in partnership with Holmusk in providing Recruitment support. No applications from agencies please.</div></div>

Senior Full Stack Developer

Talan

<div>Job Description 
Talan is seeking a skilled C# Developer with REACT experience to join our delivery teams working on Front Office platforms within Global Markets environments.
In this role, you will design, build, and enhance regulatory, alerting, and sales enablement solutions, supporting front-office users in fast-paced trading environments. You will work at the intersection of business and technology, delivering high-performance applications that directly impact sales and trading activities.
You will contribute to the development of front-office sales and trading tools within a Global Markets ecosystem, supporting a range of business-critical applications.
Operating in a distributed agile environment, you will collaborate with:<ul><li>
Front office stakeholders (sales &amp; trading)</li><li>
Application support and production teams</li><li>
QA and testing teams</li><li>
Distributed delivery teams across Europe and globally</li></ul>
This role offers exposure to complex, real-time systems within capital markets.
Key Responsibilities<ul><li>
Design, develop and maintain front-office applications, components and utilities</li><li>
Contribute across the full software development lifecycle (analysis, design, development, testing, deployment, and support)</li><li>
Build and deliver high-performance, scalable applications</li><li>
Develop RESTful APIs and modern UI applications using React</li><li>
Engage directly with business stakeholders to understand requirements and deliver value-driven solutions</li><li>
Collaborate with production support teams to ensure smooth releases and system stability</li><li>
Provide third-line support and assist with troubleshooting production incidents</li><li>
Contribute to code reviews and continuous improvement initiatives</li></ul> 
Skills &amp; Experience (Required)<ul><li>
Strong development experience in C# &amp; REACT</li><li>
Experience building web-based applications and RESTful APIs</li><li>
Solid experience with relational databases and SQL</li><li>
Experience with modern JavaScript frameworks, particularly React</li><li>
Strong understanding of application performance and optimisation</li><li>
Excellent communication skills, both written and verbal</li><li>
Experience working in agile, collaborative environments</li><li>
Experience within investment banking or capital markets environments</li><li>
Knowledge of front office systems (FX, Rates, Credit, or derivatives)</li><li>
Experience with multi-threaded or distributed systems</li><li>
Familiarity with CI/CD tools (e.g. Jenkins, TeamCity) and deployment tools (e.g. Ansible)</li><li>
Strong analytical and problem-solving skills</li></ul> 

Additional Information 
#TalanUK</div>

C# Developer - React

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