Senior Full Stack Engineer

About the Company Beff is a global Technology partner for Battery Development, mass production, and Data Management. Job Description We’re building a high-impact SaaS platform at the intersection of Battery Design, Development, and Production and software, focused on solving real-world problems in the battery ecosystem. We're looking for a Full-Stack Engineer with strong front-end skills and a passion for building real products. You’ll be responsible for taking ideas from concept to live, collaborating closely with other team members and stakeholders, and shipping features that customers love. This role is ideal for someone who’s built and launched real products, understands tradeoffs, and can balance speed with craft. Job Responsibilities • Own features end-to-end, from rough wireframes to deployed apps • Build high-quality, modular, and performant UIs using React.js and any other most suitable tools. • Collaborate with product/design to shape UX that’s intuitive • Design and build scalable APIs and backend logic using NestJS and Python • Architect solutions that are maintainable, extensible, and clean • Participate in roadmap discussions, give feedback, and contribute to product direction • Push for quality through thoughtful code reviews, testing, and refactoring • Constantly look for ways to optimize dev speed and output quality Required Skills & Experience • Bachelor's degree in computer science, Engineering (any field), or a related quantitative discipline, and at least four (4) years of experience building software products • Proven track record of building and maintaining real-world applications • Strong React.js experience and frontend fundamentals (performance, accessibility, usability) • Solid backend development experience (NestJS and Python a big plus) • Clear understanding of product tradeoffs and agile product development • Strong communication skills - you ask questions, raise flags, and explain your thinking • Startup-ready: you’re comfortable wearing multiple hats, working fast, and owning outcomes. • Any suitable combination of education, training, and/or experience is acceptable. Bonus (Nice to Have) • Experience working at an early-stage startup or shipping SaaS products • Development experience for project management software • Battery development and production experience • Familiarity with microservices or event-driven architecture • UX sensibility and ability to collaborate deeply with designers • Passion for developer experience and good internal tooling • Experience with cloud services Tech Stack • Frontend: React.js (Hooks, Context, modern state management, component libraries) • Backend: NestJS (Node.js), Python (FastAPI for data services) • Databases: PostgreSQL, Redis, NoSQL • Infra/DevOps: Docker, AWS, GitHub Actions • Tooling: Figma, Linear Why Join Us? • Create real impact in the battery and green energy world, driving a sustainable future • Build meaningful products from scratch • Shape product and engineering direction, not just code it • Fast iteration, real ownership, high impact, Salary: Negotiable