We’re a digitally transformed, tech-enabled security services company on the lookout for a Senior Mobile Engineer to take ownership of our React Native app and set the direction for mobile at scale.
This is a chance to lead from the front in a fast-moving company that’s solving real-world challenges and experimenting with modern technologies like computer vision, behaviour modelling, and gamification. You’ll make critical technical decisions, shape the architecture, raise the bar for quality, and play a key role in growing the mobile team.
You’ll collaborate closely with our Lead Engineer and product team, bringing ideas to life and moving quickly on the features that matter most. With products trusted by security teams in high-pressure environments – from critical national infrastructure to medieval castles – your work will have a tangible impact in the real world.
What You’ll Get:
- Competitive salary up to £80,000 per year (DOE).
- Flexible hybrid working – remote with occasional travel to London HQ.
- Career growth through My TKC Journey development plans.
- Access to internal training, development opportunities, and mentoring.
Company benefits:
- Salary sacrifice pension scheme.
- 24/7 confidential Employee Assistance Program.
- Voluntary health cash plan (from £1/week).
- Team perks: regular socials, monthly team days, and an exercise club.
- A dynamic, fast-paced environment where no two days are the same.
What We’re Building
- A React Native / TypeScript mobile app, powered by TanStack Query for seamless state management.
- A brand-new NextJS risk consultancy dashboard using Zustand and TanStack Query.
- High-quality codebase with excellent test coverage for confidence in every release.
- A continuously improving pipeline – from integrations to release processes – designed for speed and reliability.
- Exciting upcoming projects where you’ll have a real say in direction and implementation.
We pride ourselves on being a close-knit team where every voice matters. Your ideas won’t just be heard – they’ll be implemented quickly, with visible impact.
Our Stack
- Languages: TypeScript, JavaScript
- Frameworks: React Native, Expo, React, NextJS, Zustand
- State: TanStack Query, Zustand
- CI/CD: GitHub Actions
- Infrastructure: AWS (CloudFront, S3, WAF, EC2, Lambda), Terraform, Docker
- Backend: Java, Python, Node.js, PostgreSQL
About You: (Technical expertise)
- 4+ years of experience building production-grade mobile apps.
- Skilled in TypeScript, React Native, Zustand, and styling frameworks (Tailwind/Nativewind/SCSS).
- Confident in automated testing and high code coverage practices.
- Strong focus on performance optimisation and mobile security.
- Comfortable across the stack (REST APIs, PostgreSQL, cloud fundamentals).
- Advocate for clean code, scalable architecture, and great UX/UI.
- Excellent debugging skills with a focus on production stability.
Ways of working:
- Lead by example, mentor teammates, and drive technical standards.
- Agile mindset, delivering value iteratively and efficiently.
- Ability to align technical work with product and business goals.
- Creative problem-solver with attention to detail.
- Clear, proactive communicator who fosters collaboration.
Ready to shape the future of mobile in a fast-growing, tech-driven company?
Join us and build products that truly make a difference.
Position: Senior Mobile Engineer (React Native) - Job Type: Full-time, Permanent - Salary: Up to £80,000 per annum (DOE)
Location: Flexible hybrid – remote with monthly visits to our London Farringdon HQ
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