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

Nest JS, Node. js and Type Script .

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

Nest JS, Node. js and Type Script .

• 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

Postgre SQL .

• 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.
• 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 Type Script .

• Extensive hands-on experience with

Nest JS .

• 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

Postgre SQL , including relational data modelling and query optimisation.

• Production experience with

Redis , including caching, session management and data structures.

• Dev Ops & 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, Type Script, Nest JS

Mobile

React Native, Expo

Database

Postgre SQL

Caching

Redis

Authentication

Auth0

Cloud

AWS ECS

Infrastructure

Docker, Docker Compose

Testing

Unit, Integration & E2E

Enterprise Integration

• Kotlin / Spring Boot
• 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.

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