Senior Fullstack Mobile Engineer

We are looking for a Senior Fullstack Mobile Engineer with a strong emphasis on backend architecture to join the team developing a greenfield platform.

You will own the end-to-end technical delivery of features, with the majority of your time focused on designing and building a robust, secure, and scalable backend using NestJS, Node.js and TypeScript .

On the mobile side, you will contribute to feature integration and deployment within a React Native and Expo environment, ensuring seamless delivery across the full technology stack.

The platform operates within a large enterprise technology ecosystem, so this role requires a senior engineer who is comfortable driving technical discussions, making architectural decisions, aligning infrastructure, and collaborating with neighbouring teams working across different technology stacks, including Kotlin and Spring Boot .

This role requires onsite time in Pimlico and sits inside IR35.

Backend Architecture & Development

• Design, build and maintain highly scalable, secure and testable backend services using NestJS, Node.js and TypeScript .
• Own backend architecture and technical decisions across the platform.
• Design robust APIs, services and integrations that support long-term scalability and maintainability.
• Apply appropriate software design patterns and engineering principles throughout the platform.

Mobile Development & Integration

• Deliver end-to-end features across the backend and mobile application.
• Implement and optimise frontend capabilities using React Native and Expo .
• Work closely with backend and platform teams to ensure effective API integration and reliable mobile experiences.
• Support the build, release and deployment lifecycle of mobile applications.

Identity & Security

• Own the integration of enterprise-grade authentication and authorisation workflows using Auth0 .
• Design secure identity flows and ensure security best practices are applied across backend and mobile applications.
• Work with enterprise teams to align authentication and security architecture.

Data & Caching

• Design efficient and maintainable relational data models using PostgreSQL .
• Optimise database queries and application performance.
• Implement high-performance caching and session-management strategies using Redis .
• Make informed decisions around data consistency, performance and scalability.

CI/CD & Infrastructure

• Develop and maintain automated build, test and deployment pipelines.
• Manage CI/CD processes for backend services and mobile applications.
• Containerise applications using Docker and Docker Compose .
• Deploy and manage containerised services using AWS ECS .
• Collaborate with infrastructure and neighbouring engineering teams to ensure reliable and consistent environments.

Technical Leadership & Collaboration

• Drive technical discussions and contribute to wider architectural decisions.
• Work collaboratively with teams operating across different technology stacks, including Kotlin / Spring Boot .
• Translate business and technical requirements into pragmatic, scalable solutions.
• Take ownership of technical delivery from design through to production.
• Provide technical leadership and promote engineering best practices across the team.

Requirements

Senior Engineering Experience

• Proven experience working at Senior Engineer level, with the ability to operate autonomously and take ownership of architecture, data modelling and deployment strategies.
• Strong track record of delivering production-grade software in complex environments.
• Comfortable making technical decisions and influencing architecture across team boundaries.

Backend Expertise

• Deep, production-proven experience with Node.js and TypeScript .
• Extensive hands-on experience with NestJS .
• Strong understanding of backend architecture, API design, scalability, security and performance.
• Strong understanding of software design patterns and architectural principles.

Database & Caching

• Strong hands-on experience with PostgreSQL , including relational data modelling and query optimisation.
• Production experience with Redis , including caching, session management and data structures.

DevOps & Cloud

• Strong experience with Docker and Docker Compose .
• Hands-on experience deploying and managing containerised applications using AWS ECS .
• Experience with automated CI/CD pipelines and deployment strategies.

Frontend & Mobile

• Hands-on experience with React Native .
• Experience working with the Expo ecosystem.
• Comfortable delivering full-stack features spanning backend services and mobile applications.

Authentication & Security

• Experience implementing complex authentication and authorisation workflows using Auth0 .
• Strong understanding of application security and enterprise identity management.

Testing & Quality

• Strong commitment to automated testing and engineering quality.
• Experience writing and maintaining unit, integration and E2E tests .
• Comfortable applying testing strategies across both backend and mobile applications.

Technology Stack

Backend: Node.js, TypeScript, NestJS

Mobile: React Native, Expo

Database: PostgreSQL

Caching: Redis

Authentication: Auth0

Cloud: AWS ECS

Infrastructure: Docker, Docker Compose

Testing: Unit, Integration & E2E

Enterprise Integration: Kotlin / Spring Boot

Benefits

• Competitive Rates
• Flexible working arrangements
• Opportunities for professional development and career advancement within a global company
• A dynamic, innovative, and supportive work environment, where your ideas and contributions are valued
• The chance to work on cutting-edge projects that are transforming the industry
• Most of all you get to work with a bunch of great people, where the whole team owns the project together in a politics-free environment. Our culture reflects our lean and self-organisation attitude. We encourage our colleagues to take risks, make decisions, work in a collaborative way and talk to everyone to enhance communication. Freedom and Responsibility go hand in hand, and we value commitment, feedback, and empathy.