Javascript Developer

JR United Kingdom; Slough; On-site; GBP 40,000 - 60,000; Full time

Job summary

A leading company in the UK is seeking a skilled front-end developer specializing in React.js and NextJS for a 6-month contract. The role involves developing high-traffic eCommerce applications, optimizing web performance, and mentoring junior developers in a dynamic Agile team environment.

Qualifications

• Solid commercial experience in React/Redux development.
• Good understanding of TDD and CI/CD best practices.
• Ability to coach and mentor junior team members.

Responsibilities

• Create well-crafted front-end web applications using React.js and NextJS.
• Support and develop server-side rendered applications using AWS Lambda.
• Test front-end applications with various testing methodologies.

Skills

React

Redux

TDD

CI/CD

Testing frameworks

AWS Lambdas

Performance Optimization

Mentoring

Tools

Jenkins

Concourse

Cypress

NodeJS

GraphQL

Job description

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Contract: 6 Months

Location: London Area, UK

Job Responsibilities:

• Create well-crafted front-end web applications using React.js and NextJS.
• Support and develop server-side rendered web applications, utilizing AWS Lambda.
• Write resilient code that is continuously tested, deployed, and performs at scale. Test front-end applications with end-to-end, unit, functional, integration, visual regression, and lighthouse testing.
• Be part of a self-organizing, cross-functional Agile team building high-traffic eCommerce and service web applications for clients and OTT products.
• Contribute to the team’s technical direction and improve tools and processes.
• Ensure code quality aligns with the department's technical strategy—performance, resilience, security, and monitoring.

Required Experience:

• Solid commercial experience in React/Redux development.
• Good understanding of development best practices such as TDD, CI/CD.
• Experience with CI tools (Jenkins, Concourse) and testing frameworks.
• Experience optimizing web applications in performance, security, and resilience.
• Enthusiasm to push for improvements and learn from the developer community.
• Ability to coach and mentor junior team members.
• Desirable: experience with TypeScript, NodeJS, NextJS, GraphQL, Cypress.
• Knowledge of AWS Lambdas.