Senior Full-Stack Developer

Senior Full-Stack Developer

Fuelfinance is on a mission to revolutionize financial management for early-stage startups, empowering them to take control of their finances and thrive. We recently raised $1M in Seed Funding from top-tier investors like Markus Villig (Bolt), John S. Kim (SendBird), Stratmind, and Bad Ideas funds, following 3 years of profitable, bootstrapped success. Trusted by businesses with over $200M in P&L, including Reface, Petcube, and Hampton, we've built a universal tool that brings clarity and insight to finance management. With 38% of startups failing due to cash flow issues, our goal is to prevent these failures and unlock trillions in GDP growth. At Fuelfinance, we're not just creating software — we're safeguarding the future of thousands of startups. Join us and be part of this impact!

We're looking for a Senior Full-Stack Developer to help build the next generation of our product: AI-powered finance agents that automate financial workflows for startups and SMBs.

You'll join at the moment this transition is happening — the work is greenfield, fast-moving, and shipped to real paying customers. You'll own features end-to-end across the stack, from architecture decisions to production monitoring, and build with AI as your default workflow. This isn't a role for someone who waits for tickets; it's for an engineer who spots problems, proposes solutions, and ships.

You'll join a team of 4 engineers, 1 QA, and a Product Owner, reporting to the Head of Engineering.

What Will You Build?

• AI finance agents: forecasting, financial analytics, automated workflows
• MCP infrastructure and the agent orchestration layer
• Integrations with accounting platforms, banks, and payment systems (QuickBooks, Xero, Stripe)
• Dashboards, access controls, and reporting infrastructure

What Are Your Responsibilities?

• Design, build, and own features end-to-end across the stack — from architecture decisions to production monitoring
• Build with AI as your default workflow: agentic coding tools with proper codebase context and end-to-end test verification
• Develop agentic AI workflows: LLM-powered features with proper context management, tool use, and automated end-to-end testing
• Make pragmatic technology choices and defend them — weighing cost, speed, and long-term maintainability
• Identify problems and propose solutions before they're assigned to you
• Keep security and data integrity at the core of everything
• Estimate, communicate risks early, and ship fast without cutting corners that matter

What Are The Preferred Requirements For The Role?

• 6+ years of software engineering experience with real depth
• Proficiency with AI-assisted development (a must) — not just chat-based usage: you know how to build agentic coding workflows, feed the right codebase context to models, and verify AI output with end-to-end testing
• Proficiency in both frontend and backend development
• TypeScript, Node.js (Nest.js), React
• SQL, MongoDB
• AWS knowledge
• B2/C1 English level
• Experience enhancing system and infrastructure security
• Proactive approach
• Comfortable with startup mode: shifting priorities, fast pace, high ownership

Will Be A Plus:

• Experience with LLM APIs in production (Anthropic, OpenAI), RAG
• Fintech background or experience on security-focused projects
• Knowledge of one of the following: C#, Java, Go, Python
• Early-stage startup experience
• Experience with infrastructure setup

This Role Won't Fit If:

• You wait for clarity instead of creating it
• AI tooling is something you've read about rather than used daily
• You prefer a stable roadmap over shifting priorities and high ownership

Recruitment Process:

• Soft skills interview with the recruiter
• System Design & Experience Review with the Head of Engineering
• Culture fit interview with the VP of Operations
• Final Interview with the CEO

Why Work With Us?

• Build the future of finance work — design AI-native finance products, not just maintain them
• Rapid skills improvement
• Growth opportunities according to our seniority grading (it comes with a compensation increase)
• Flexible schedule and time-off policy
• 18 days of paid vacation per year, paid sick leaves