Middle React Developer (AI-First SaaS / FinTech)

We’re seeking a Middle React Developer to help our client from the EU build the next generation of an AI-first SaaS platform. The role combines hands-on product development for accounting workflows, document-centric processes, and responsible integration of AI capabilities. The developer will work closely with founder and finance specialists, and external technical experts to turn business needs into secure, scalable, and intuitive products for accounting. Must-Have Experience - Professional experience developing production-grade React applications - Strong command of TypeScript, modern JavaScript, component architecture, and state management - Hands-on experience with Firebase, including authentication - Experience integrating multiple LLMs, MCPs, APIs and third-party services - Experience with document management, including document storage, metadata, permissions, search, versioning, and workflow automation - Delivery and task ownership, strong communication skills to work independently and collaborate with part-time UX, DevOps, QA - English level B2 or higher (spoken) Required Tech Stack - Front-end (2–3 years of experience): ReactJS, Redux Toolkit, React Final Form, Material UI, JavaScript, CSS, and HTML - Back-end (1–2 years of experience): Java, Spring Boot (JPA, Data, Web), Maven, and SQL - Database: PostgreSQL and SQL - Other: RESTful APIs, Docker, Git, GitHub Actions. AI-First Development Mindset - Demonstrated understanding of AI-first product development and how AI skills can be embedded into a reliable delivery engine. - Practical familiarity with LLM APIs, AI-assisted development tools, prompt design, structured outputs, or agent-based workflows - Ability to evaluate AI use cases for accuracy, security, privacy, explainability, and business value - Curiosity about emerging AI technologies and the judgement to distinguish durable capabilities from short-term trends Role Expectations - Translate finance and document-management requirements into user-friendly React solutions - Previous experience with accounting concepts, finance processes, reporting, controls - Collaborate directly with finance specialists and company founder - Take ownership of requested features from discovery and estimation through delivery and support - Communicate progress, technical trade-offs, risks, and dependencies transparently We Offer - Opportunity to propose solutions and influence technical decisions - Dynamic and challenging tasks - Team of experienced professionals - Competitive salary - Low bureaucracy - Continuous self-improvement - Long-term employment with paid vacation and social benefits - A bunch of perks 😊 Відгукнутись на вакансію