Full-Stack Software Engineer (Frontend-Focused)

Position: Full-Stack Software Engineer (Frontend-Focused)

About the Company

Beff is a global company that provides a software/hardware platform to enable a carbon-neutral society through the development of batteries, which are core components of electric vehicles.

Job Description

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

Reference Annual Salary

• Engineering Leader～Manager
  Example: ¥6,000,000 per year (including 25 hours of fixed overtime) + bonus (based on company performance and individual evaluation) = ¥7,000,000～

※The final offer will be determined based on your experience and skills.

Application Notes

To ensure a smooth screening process, please make sure to include the following information in your CV when applying:

• Major development projects you have worked on (including both professional and personal projects)
• Your specific responsibilities and roles in each project
• Programming languages, frameworks, and tools used (e.g., React.js, NestJS, Python, AWS, etc.)
• Additional details such as the type of product, team structure, and development duration will also help facilitate the selection process.

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,

Join our team at Beff, where we’re not just planning for the future, we’re creating it!

Required Skills & Experience

• At least four (4) years of professional experience in software product development after obtaining a bachelor's degree, with a proven track record of working within an organization
• 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/or 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