At a Glance
- Tasks: Develop and ship cutting-edge mobile and web interfaces for an AI-driven digital banking platform.
- Company: Join a pioneering company at the forefront of digital financial products.
- Benefits: Competitive salary, remote work, and opportunities for professional growth.
- Other info: Collaborative remote-first culture with a focus on innovation and mentorship.
- Why this job: Shape the future of finance with innovative technology and impactful projects.
- Qualifications: 10+ years in software engineering, expertise in React Native, and fintech experience.
The predicted salary is between 128000 - 160000 £ per year.
Join to apply for the Senior Software Engineer / Staff Engineer / Architect role at Mission.dev.
Base pay range: $160,000.00/yr - $200,000.00/yr
Agreement type: This is a full-time employment role, requiring 40 hours per week, directly hired by the client.
Location of the engineer: Remote 100%.
About the client:
The client is a company developing the next generation of digital financial products. Their mission is to build scalable, secure, and highly customizable banking solutions that merge traditional fintech capabilities with cutting-edge AI innovations. Their multidisciplinary teams—spanning engineering, design, and machine intelligence—deliver platforms that make financial operations smarter, faster, and more transparent. They value craftsmanship, autonomy, and curiosity, qualities that enable them to move quickly while maintaining precision. With a global presence and a remote-first culture, the client brings together specialists from finance, blockchain, and artificial intelligence to push the boundaries of what’s possible in digital money and data systems.
About the role:
We are looking for a senior Fullstack Software Engineer to help build the foundation of our AI-driven digital banking platform. This role combines deep technical ownership with product craftsmanship. You will design and implement features that connect modern frontend interfaces with secure, scalable serverless backends, enabling real-time, data-intelligent financial interactions. You’ll work across the full product stack, collaborating with design, data, and AI teams to deliver polished user experiences backed by robust cloud infrastructure. This is an opportunity to join a small, high-impact engineering team where your work directly shapes how people interact with intelligent financial tools.
What You’ll Do:
- Develop and ship production-grade mobile and web interfaces using React Native with Expo, ensuring design precision and smooth performance.
- Take ownership of core fintech product modules such as digital wallets, payments, transaction ledgers, onboarding, and notification systems.
- Design and maintain scalable APIs and data pipelines within a serverless AWS environment (Lambda, API Gateway, DynamoDB, Kinesis, EventBridge).
- Integrate digital asset and stable-value payment flows while maintaining high standards for compliance and data protection.
- Build real-time, event-driven user experiences using WebSockets and server-streaming connections, including conversational and AI-assisted features.
- Enhance app performance and reliability using profiling and monitoring tools like Sentry and Better Stack, along with libraries such as Hermes, Reanimated, and FlashList.
- Partner with design teams to translate Figma prototypes and design tokens into consistent UI implementations.
- Apply AI-supported development workflows (e.g., using Cursor, Claude, or related assistants) to accelerate delivery and improve testing coverage.
- Contribute to team-wide standards for AI-assisted development, evaluating new tools that enhance velocity and quality.
- Provide technical guidance and mentorship to peers, promoting best practices for building secure, performant, AI-integrated fintech systems.
What You Bring:
- 10+ years of professional software engineering experience, including 5+ years in mobile-first or fintech applications.
- Proven experience delivering complex, secure, and high-quality financial software in production environments.
- Deep expertise with React Native + Expo and modern TypeScript development across frontend and backend layers.
- Strong background in serverless architectures and AWS cloud services.
- Understanding of secure identity management (JWT, Cognito, or comparable systems) and financial-grade data security practices.
- Familiarity with stablecoin payment mechanisms, blockchain integrations, or payment APIs.
- Practical knowledge of real-time networking technologies (WebSockets, SSE).
- Experience using AI-enhanced IDEs or developer tools in daily workflows.
- A mindset geared toward innovation and experimentation, especially around how AI changes the software development process.
Preferred Experience:
- Understanding of blockchain-based transactions or tokenized payments.
- Familiarity with design systems, performance optimization, and testing automation.
- Experience mentoring engineers or leading small, cross-functional development teams.
Senior Software Engineer / Staff Engineer / Architect in London employer: Mission.dev
At Mission.dev, we pride ourselves on being an exceptional employer that champions innovation and collaboration in the fintech space. Our remote-first culture allows for flexibility and work-life balance, while our commitment to employee growth ensures that you will have ample opportunities to develop your skills and advance your career. Join a diverse team of experts dedicated to crafting cutting-edge digital banking solutions, where your contributions will directly impact the future of financial technology.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Engineer / Staff Engineer / Architect in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the fintech and AI space. Attend meetups, webinars, or even online forums where you can chat with industry folks. You never know who might have a lead on that perfect role!
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those involving React Native, serverless architectures, or AI integrations. A well-presented portfolio can really make you stand out when you're chatting with potential employers.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and system design knowledge. Practice common interview questions related to fintech applications and serverless environments. We recommend using platforms like LeetCode or HackerRank to get in the zone!
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we’ve got some exclusive features that can help you land that Senior Software Engineer role!
We think you need these skills to ace Senior Software Engineer / Staff Engineer / Architect in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the role. Highlight your expertise in React Native, AWS, and fintech applications to catch our eye!
Craft a Compelling Cover Letter:Use your cover letter to tell us why you're passionate about building AI-driven financial products. Share specific examples of your past work that demonstrate your craftsmanship and innovation.
Showcase Your Projects:If you've worked on relevant projects, don’t hesitate to include links or descriptions. We love seeing real-world applications of your skills, especially in mobile-first or fintech environments.
Apply Through Our Website:For the best chance of getting noticed, apply directly through our website. It helps us keep track of your application and ensures you’re considered for this exciting opportunity!
How to prepare for a job interview at Mission.dev
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in React Native, Expo, and AWS services. Brush up on your knowledge of serverless architectures and secure identity management systems. Being able to discuss your past projects and how you’ve implemented these technologies will show your depth of experience.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles, especially in fintech applications. Think about how you approached these problems and the solutions you implemented. This will demonstrate your ability to think critically and innovate, which is key for this role.
✨Familiarise Yourself with AI Integration
Since the client values AI-driven solutions, be ready to talk about how you've used AI tools in your development process. Whether it’s using AI-enhanced IDEs or integrating AI features into applications, showing your familiarity with these concepts will set you apart.
✨Prepare Questions That Show Your Curiosity
Have a few thoughtful questions ready that reflect your interest in the company’s mission and products. Ask about their approach to building scalable financial solutions or how they incorporate feedback from users. This shows you’re not just interested in the job, but also in contributing to their vision.
