Senior Full-Stack Developer for Fintech MVP

# Senior Full-Stack Developer Needed — Fintech Comparison Marketplace MVP We are building **Fidati**, a new fintech platform helping small and medium-sized businesses compare and access business financing. We are looking for a **Senior Full-Stack Developer / Product Engineer** able to take ownership of our first production-ready MVP from architecture to deployment. This is **not a simple website**. We strongly prefer candidates who have already built **comparison engines, marketplaces, aggregators, lending platforms, fintech/insurtech products, lead-generation platforms, or other data-driven transactional applications**. Experience delivering software **end-to-end** is essential. ## MVP Scope The first release is focused on one core use case: ### Business Financing Comparison Engine A business owner should be able to: 1. Visit the website without registering. 2. Enter: * financing amount; * duration; * financing purpose. 3. View compatible financing products from multiple lenders. 4. Compare: * estimated monthly payment; * nominal interest rate; * APR / total annual cost where available; * duration; * estimated total cost; * fees; * main eligibility requirements; * indicative response time. 5. Filter and sort results. 6. Open a product detail page. 7. Select a product. 8. Enter basic company/contact information. 9. Submit a financing enquiry. 10. Receive a unique Fidati request ID. The Fidati team must then be able to see and manage the request in an internal back office. ## Admin / Back Office The MVP must include a secure admin area to: * create and manage lenders; * create and manage financing products; * publish / unpublish products; * update pricing and conditions; * store source URL and last verification date; * version financing products; * review financing enquiries; * update request status; * view basic funnel analytics. Initially, approximately **10–20 financing products will be entered manually**. We do NOT want to rely on web scraping in the first release. ## Comparison Engine Products should be filtered based on: * requested amount; * duration; * purpose; * minimum / maximum amount; * minimum / maximum term; * product availability. Initial ranking must be **deterministic and transparent**, not AI-based. Example default logic: 1. lowest available APR; 2. estimated total cost; 3. estimated monthly payment. Users must be able to change the sorting criteria. ## Financial Calculations We need a deterministic, unit-tested calculation module able to calculate, where applicable: * monthly payment; * total payments; * total interest; * estimated total cost. Financial calculations must **not use generative AI**. APR must never be invented from incomplete information. If unavailable, it should simply be shown as unavailable. ## Product Versioning This is an important requirement. If a financing product changes its rate or conditions, the previous version must remain available historically. We need to know: > Which exact conditions were displayed when a customer selected the product? Each product should therefore retain: * version; * effective date; * source; * source URL; * verification date; * historical versions. ## Preferred Technology Stack ### Frontend * Next.js * React * TypeScript * Tailwind CSS * responsive / mobile-first UI ### Backend * Node.js * NestJS * TypeScript * REST APIs * OpenAPI documentation ### Database * PostgreSQL ### Infrastructure Ideally: * AWS; * European region; * Docker; * Terraform; * GitHub Actions; * CI/CD; * separate development, staging and production environments. Architecture preference: **modular monolith**, no unnecessary microservices. ### Testing * unit tests; * integration tests; * Playwright end-to-end tests. ## Required Experience Please apply only if you have strong experience with: * senior full-stack development; * React / Next.js; * TypeScript; * Node.js backend development; * PostgreSQL; * REST API design; * authentication and role-based access; * admin / back-office systems; * production deployment; * Git / pull-request workflows; * automated testing; * building software from architecture to production. ## Very Important Experience We are especially interested in developers who have built: * price comparison websites; * financial product comparison tools; * marketplaces; * aggregators; * loan comparison engines; * insurance comparison platforms; * travel / energy / telecom comparison engines; * fintech SaaS products; * lead-generation marketplaces. Please clearly explain your direct experience in these areas. ## Strong Plus Experience with: * fintech; * lending; * credit; * banking; * financial marketplaces; * financial calculations; * regulated industries; * AWS; * Terraform; * security-oriented SaaS applications; * SEO-oriented Next.js applications. ## Security Requirements The MVP must already follow a production mindset: * HTTPS; * secure authentication; * MFA for admin users; * role-based access; * server-side validation; * rate limiting; * secure secrets management; * database backups; * structured logging; * no sensitive data in logs; * audit trail for relevant admin actions. ## Out of Scope The following are NOT part of this MVP: * Open Banking; * credit bureau integrations; * document OCR; * document upload; * proprietary credit scoring; * Credit Health; * AI Credit Advisor; * direct bank integrations; * lender CRM integrations; * appointment booking with banks; * automated loan applications; * native mobile apps; * machine learning; * multi-agent AI systems. The architecture should allow these modules to be added later without rebuilding the platform. ## First Required Vertical Slice Before expanding the product, we want this flow working end-to-end: ### ADMIN Create 3 lenders → create 10 financing products → publish them ### USER Visit Fidati → request €250,000 over 60 months → view compatible products → compare results → select one product → submit company information → create a financing enquiry ### ADMIN See the new enquiry