Next JS Senior engineer

Next JS Senior engineer
12 Month contract initially + Extensions
Based: Hybrid - Max 1-2 days p/w Onsite in Coventry or London
Rate: £Market rates p/d (via Umbrella company)

We have a great opportunity with a world leading organisation where you will be provided with all of the support and development to succeed. A progressive organisation where you can really make a difference. We have a great opportunity for a Next JS Senior engineer to join the team.

You will be responsible for developing robust full-stack capabilities, including Back End APIs, Server Side logic, and MongoDB integrations, while applying clean code and SOLID design principles. The role will also focus on performance optimisation through SSR, SSG, ISR, advanced caching, and asset optimisation to maintain excellent Core Web Vitals. In addition, you will implement end-to-end observability using New Relic, ensuring comprehensive logging, tracing, and metrics collection across both client-side and Server Side runtimes.

Key Responsibilities
* Design and build robust web applications using Next.js App Router, React Server Components (RSC), and Server Actions.
* Develop and maintain scalable Back End APIs to support complex business workflows.
* Design and implement MongoDB data models and database schemas to support application requirements.
* Build efficient Server Side logic and integrations across the full application stack.
* Apply clean code practices and SOLID design principles to deliver maintainable and extensible solutions.
* Implement and optimise data-fetching strategies including SSR, SSG, and ISR.
* Develop and maintain advanced caching mechanisms to improve application scalability and performance.
* Optimise application assets and user experiences to achieve strong Core Web Vitals.
* Implement end-to-end observability with New Relic, including logging, tracing, and metrics collection.
* Monitor and troubleshoot application performance across both client-side and Server Side (Node.js/Serverless) runtimes, driving continuous improvements in reliability and operational visibility.

Key Skills & Experience:
* Next.js Expertise: Strong hands-on experience with Next.js App Router, React Server Components (RSC), and Server Actions for building modern web applications.
* React & TypeScript Development: Proficiency in React, TypeScript, JavaScript (ES6+), component-based architecture, and modern Front End development practices.
* Full-Stack Engineering: Experience developing scalable Back End APIs, Server Side logic, and end-to-end application functionality.
* MongoDB & NoSQL Databases: Strong knowledge of MongoDB, data modelling, schema design, and database integration patterns.
* Software Design Principles: Solid understanding of clean code practices, SOLID principles, and maintainable application architecture.
* Performance Optimisation: Experience implementing SSR, SSG, ISR, caching strategies, and asset optimisation to achieve strong Core Web Vitals.
* Observability & Monitoring: Hands-on experience with New Relic for application monitoring, distributed tracing, logging, and metrics collection.
* Node.js Development: Experience developing and supporting Server Side applications using Node.js runtimes.
* Application Troubleshooting: Strong analytical and problem-solving skills with the ability to identify and resolve performance and application issues.
* Agile Delivery: Experience working in Agile/Scrum environments, participating in sprint planning, reviews, retrospectives, and iterative software delivery.

Desirable skills/knowledge/experience:
* Retail Domain Experience: Knowledge of retail business processes and customer-facing digital platforms, preferably within large UK retail organisations.
* Performance & Load Testing: Practical experience with performance, load, and scalability testing using tools such as k6, JMeter, or equivalent.
* Microservices Architecture: Understanding of microservice architecture patterns, distributed systems, and service integration principles.
* MongoDB Administration: Experience with MongoDB configuration, schema design, indexing strategies, and performance optimisation.

This is an excellent opportunity on a great project of work, If you are looking for your next exciting opportunity, apply now for your CV to reach me directly, we will respond as soon as possible.

LA International is an award-winning partner of choice for many of the world's most influential companies and government organisations. Holding Enhanced Government Security Accreditation, we are recognised as the European market leader in the delivery of Security Cleared talent to organisations that demand the very highest levels of security, compliance and assurance.

A multiple award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over consecutive years. We are committed to fostering an inclusive, equitable and accessible workplace where everyone feels valued and supported. We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply. If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience.

Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.