React Native Engineer

The Company

Founded in 2015, Expense In set out to make expense management easier and less frustrating, replacing time‑consuming, paper‑based processes with a smarter, faster solution. As we grew, we introduced new modules like invoice management, carbon reporting, and volunteer expense claims – all designed to save businesses time and hassle.

Today, we help companies in over 50 countries process more than a million expenses every month. In January 2025, we were acquired by Accounts

IQ to bring even more value to finance teams. Together with the AIQ team, we continue to innovate and scale, helping businesses take control of their finances with smarter, more connected solutions.

Reporting to the VP of Product, we’re seeking an experienced React Native Engineer to join the UK’s leading cloud‑based expense management solution. In this role, you will be responsible for developing and maintaining all aspects of the mobile application, including the front‑end, local storage and API calls, while showcasing your enthusiasm for delivering high‑quality and innovative software solutions.

While your primary focus will be the Expense In mobile app, we’re particularly interested in candidates who are keen to broaden their involvement across our platform. There will be opportunities to contribute to other applications built with technologies such as Type Script and Next.js, working within a collaborative agile team and helping shape the application’s architecture and technical direction.

• Maintaining, enhancing and deploying the Expense In React Native mobile application
• Responsible for the React Native mobile stack, including UI development, layered application architecture, and local SQL persistence
• Participating in collective ownership of the application’s domain‑driven architecture following established object‑oriented design principles
• Participating in all parts of the development process from design to testing and delivery
• Writing and executing unit, integration and system tests on both your own and others’ code
• Performing code reviews and implementing secure coding practices
• Working well in a team, including technical and non‑technical colleagues

3+ years of experience working with the following technologies:

• iOS and Android mobile development (React Native and Type Script)
• SQL and database design (SQLite or similar)
• Offline storage and data synchronisation
• Excellent understanding of HTTP and REST
• Unit testing frameworks such as Jest
• HTML & CSS (Tailwind, Bootstrap or similar)
• Degree in an IT‑related discipline
• First‑class interpersonal and communication skills (both written and verbal)
• Knowledge of automated testing tools and frameworks would also be beneficial, along with exposure to Dev Ops, technical documentation writing and open‑source work

As a forward‑thinking, collaborative company, we combine drive, energy, and ambition with a friendly, supportive culture that encourages everyone to do their best work. With a strong focus on growth and expansion, we’re poised to elevate both the Expense In product and the level of service we provide to our customers. We’re looking for passionate, talented individuals to join our team as we work together to increase efficiency and add value to ordinary business processes.

• 28 days annual leave + bank holidays + your birthday off
• Remote working from within the UK
• Working from abroad – up to 6 weeks per calendar year
• Private Health Insurance
• 5% Pension contribution
• Life Assurance – 4 x Salary
• Income Benefit
• Wellbeing initiatives

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