Looking for Senior (6+ years) Full-stack Developer (Back-end focused)

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Looking for Senior (6+ years) Full-stack Developer (Back-end focused) English B2+ A university degree in computer sciences. 💡Poland, Warszawa based candidates only. 💡Mandatory domain expertise in Finance and Insurance. Must understand financial logic and data integrity.   • 8+ years of experience in software development with a deep focus on Back-end architecture. • Expertise in PostgreSQL and raw SQL: Experience working without ORMs, managing migration-driven schemas, and implementing immutable double-entry ledgers. • Deep knowledge of Next.js 16 (App Router) and TypeScript: Proficiency in building scalable architectures using API route handlers and service layers in a Serverless environment (Vercel). • Strong experience with modern Frontend: React 19 and Tailwind v4 (without heavy state-management libraries). • Practical experience with Fintech integrations: Stripe payments, Auth.js (v5), and complex authentication (Passkeys, TOTP). Will be a plus: • Experience with Java • Experience with AI/LLM integrations . • Knowledge of regulatory compliance and security standards in Fintech/Insurtech. • Experience with PDF generation (react-pdf / pdf-lib) and pluggable email provider layers. • Experience in early-stage startups, moving from MVP to production-grade systems. • Understanding of Node 24 features and modern web standards Send CV, location and rate in DM ——— Контакт: [handle] Компания: Mainsoft Сайт: mainsoft.org Регион команды: Европа Регион работы: Европа #lookfor #outstaff #longterm #NextJS #TypeScript #Fintech #PostgreSQL

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