Full-Stack Software Engineer (Frontend-Focused)(m/f/d)

JAC Recruitment; Stuttgart; Vor Ort; EUR 60.000 - 80.000; Vollzeit

Benefits dieser Stelle

Salary €60k–€80k gross per annum

100% onsite Stuttgart office

Career growth opportunities

Direct access to founders and product팀

Zusammenfassung

JAC Recruitment is seeking a Full-Stack Engineer to join our Stuttgart-based software hub. You will build a high-impact SaaS platform at the intersection of Battery Design, Development, and Production, delivering real products from concept to live.

You’ll own features end-to-end, craft scalable backend logic with NestJS and Python, and collaborate closely with product and design to ship customer-loved capabilities. This onsite role requires startup agility and a strong product mindset.

Qualifikationen

• - Bachelor's degree in computer science, engineering, or a related quantitative discipline and 4+ years building software products.
• - Proven track record of building and maintaining real-world applications.
• - Strong React.js experience and frontend fundamentals.
• - Backend development experience with NestJS and/or Python.
• - Clear understanding of product tradeoffs and agile development.
• - Excellent communication and startup-ready attitude.
• - Applicants must be legally authorized to work in Germany.

Aufgaben

• Own features end-to-end from concept to deployed apps.
• Build modular, high-quality UIs with React.js.
• Collaborate with product/design to shape UX.
• Design and build scalable APIs and backend logic with NestJS and Python.
• Architect maintainable, extensible solutions; participate in roadmap discussions.
• Push for quality via code reviews, testing, and refactoring.
• Improve dev speed and output quality continuously.

Kenntnisse

React.js

Frontend performance

Frontend accessibility

Frontend usability

Communication

Startup mindset

Real-world apps

Team collaboration

Ausbildung

Bachelor's degree in CS/Engineering

Tools

NestJS

Python

Docker

AWS

Jobbeschreibung

Company Overview

This company is an innovative technology business operating at the intersection of advanced battery technology and software development. It supports customers throughout the battery lifecycle, from research and development to production readiness and data-driven optimization.

The Germany-based team serves as the company's software and digital solutions hub, developing platforms that enable customers to analyze, manage, and extract valuable insights from complex battery data. By combining expertise in battery science with modern software engineering, the company helps customers accelerate innovation, improve product performance, and make informed technical and business decisions.

With customers across Europe, North America, and Asia, this company is experiencing continued growth driven by the increasing demand for battery technologies, electrification, and data-driven development solutions.

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

Job Requirements

Mandatory Qualifications (All must be met):

• 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/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.
• Applicants must already be legally authorized to work in Germany.

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.

Benefits

• Salary Range: €60,000–€80,000 gross per annum
• Work Style: 100% onsite in Stuttgart office
• Team Environment: Agile, collaborative, and high-ownership culture
• Career Growth: Clear path toward leadership or specialist roles
• Learning & Development: Direct access to founders and product teams