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- Tasks: Architect and build innovative treasury infrastructure and AI-powered financial solutions.
- Company: Exciting pre-seed fintech shaping the future of stablecoin commerce.
- Benefits: Founding-level equity, high ownership, and a chance to shape engineering culture.
- Other info: Dynamic startup environment with significant growth potential and impact.
- Why this job: Join as a key player in revolutionising cross-border finance with cutting-edge technology.
- Qualifications: 5+ years full-stack experience with React/TypeScript and Node.js or Python.
The predicted salary is between 80000 - 100000 £ per year.
Pre-seed fintech building the financial operating system for the stablecoin era.
Join a high-growth fintech as the founding technical leader building the future of cross-border commerce. You will own the technical architecture for a platform integrating Stellar/USDC rails with an AI-powered Agentic CFO layer. This is a high-ownership role driving product execution from early design partners to global scale.
Location: London, UK
Why this role is remarkable:
- Significant founding-level equity (1–5%) and the chance to shape the engineering culture from the ground up as the most important hire of 2026.
- Lead a product with 25+ signed design partners, founded by an industry veteran who previously scaled a major European crypto card issuer.
- Build at the cutting edge of finance, combining programmable stablecoin infrastructure with autonomous AI agents to automate treasury and cross-border payments.
What You Will Do:
- Architect and build core treasury infrastructure including multi-currency wallets, stablecoin on/off ramps, and yield optimization protocols.
- Develop the Agentic CFO layer featuring LLM-powered financial intelligence, autonomous action pipelines, and semantic caching.
- Lead the end-to-end execution of a merchant dashboard using React/TypeScript and Node.js/Python to simplify complex global financial operations.
The ideal candidate:
- 5+ years of full-stack experience with production ownership of React/TypeScript and Node.js or Python backend systems.
- Proven track record shipping AI/LLM-powered products including agentic workflows, RAG pipelines, or LLM infrastructure.
- Previous experience as an early engineer or CTO at a startup with a strong bias for shipping in fast-paced, high-ownership environments.
Senior Full-Stack Engineer at Pre-seed fintech building stablecoin infrastructure employer: Jack & Jill
Contact Detail:
Jack & Jill Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Full-Stack Engineer at Pre-seed fintech building stablecoin infrastructure
✨Tip Number 1
Network like a pro! Reach out to folks in the fintech space, especially those who are already working at companies you’re interested in. A friendly chat can open doors and give you insider info that could help you stand out.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repo showcasing your projects, especially those involving React, Node.js, or AI. This is your chance to demonstrate your expertise and passion for building innovative solutions.
✨Tip Number 3
Prepare for technical interviews by brushing up on your coding skills and system design principles. Practice common interview questions and consider mock interviews with friends or mentors to build confidence.
✨Tip Number 4
Don’t forget to apply through our website! We love seeing candidates who take the initiative. Plus, it’s a great way to ensure your application gets into the right hands quickly.
We think you need these skills to ace Senior Full-Stack Engineer at Pre-seed fintech building stablecoin infrastructure
Some tips for your application 🫡
Show Your Passion for Fintech: When writing your application, let your enthusiasm for fintech shine through! We want to see how excited you are about building the future of finance and how your skills align with our mission.
Highlight Relevant Experience: Make sure to showcase your full-stack experience, especially with React/TypeScript and Node.js or Python. We’re looking for someone who has a proven track record in shipping AI-powered products, so don’t hold back on those achievements!
Tailor Your Application: Don’t just send a generic application! Tailor your CV and cover letter to reflect the specific requirements of the Senior Full-Stack Engineer role. We love seeing candidates who take the time to connect their experiences to what we’re building.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for this exciting opportunity to shape our engineering culture from the ground up!
How to prepare for a job interview at Jack & Jill
✨Know Your Tech Stack Inside Out
Make sure you’re well-versed in React, TypeScript, Node.js, and Python. Brush up on your experience with AI/LLM-powered products, as this role is all about integrating cutting-edge technology. Be ready to discuss specific projects where you've used these technologies and how they contributed to the success of the product.
✨Showcase Your Leadership Skills
Since this is a founding technical leader position, highlight your previous experiences leading teams or projects. Share examples of how you’ve driven product execution in fast-paced environments and how you’ve shaped engineering culture in past roles. This will demonstrate your readiness for high-ownership responsibilities.
✨Understand the Fintech Landscape
Familiarise yourself with the current trends in fintech, especially around stablecoins and cross-border commerce. Being able to discuss the implications of these technologies and how they can be leveraged in the role will show your genuine interest and understanding of the industry.
✨Prepare Questions for Them
Interviews are a two-way street! Prepare insightful questions about their vision for the platform, the challenges they foresee, and how they plan to scale. This not only shows your enthusiasm but also helps you gauge if the company aligns with your career goals.