Front End Engineer - Team Product H/F

Alta Ares is a deeptech startup founded in 2024, building real-time AI for defense operations (ISR, C-UAS). Our primary clients are NATO-aligned militaries, with regular deployments during live exercises. Raised €2M pre-seed in May 2025. Products include:

• Real-time AI ISR module deployable on drones and tactical platforms
• Full-stack Counter-UAS (C-UAS) solution enabling autonomous drone takeover under GNSS-denied environments
• MLOps platform for training & deploying military-grade AI models
• Radar Intelligence platform for fusing and analyzing track data

• Location: Paris, France (hybrid possible)
• Reports to: Head of Product
• Position Objective: Build and scale user-facing applications across Alta Ares’ platforms, with a strong focus on front-end excellence and the ability to contribute across the stack when needed
• Tech stack: ReactJS, NodeJS, Kotlin, Python (web servers), Figma
• Contract: Full-time, permanent position (CDI)

As a Front-End Engineer, you will own the development of high-quality interfaces across our software platforms (cloud, on-premise, and edge deployments) with a strong product-vision.

While your core strength is front-end engineering and design systems, you are comfortable contributing beyond the UI layer working with APIs, backend services, and system integrations when required. We are a small and agile company, requiring flexibility.

This role is ideal for engineers coming from SaaS or scale-up environments who combine frontend craftsmanship with product ownership and versatility.

• Consolidate existing software products and lead cross-products code refactors when needed
• Build scalable, maintainable web applications using modern frameworks
• Develop and maintain a coherent design system and reusable component library, in collaboration with our UI/UX designer
• Ensure high standards of UX, consistency, and visual quality across products

• Build applications that run across cloud, on-premise, and edge environments
• Handle diverse data patterns (real-time, batch, intermittent connectivity)
• Ensure resilience and usability in constrained or operational contexts

• Optimize frontend performance and application responsiveness
• Ensure reliability in mission-critical environments
• Debug production issues across the stack when necessary

• Integrate with backend APIs and data services
• Contribute to backend or middleware when needed (API design, data handling, debugging)
• Work across the stack to unblock progress in a small, fast-moving team

• Write unit, integration, and end-to-end tests
• Maintain high standards of code quality and documentation
• Participate in code reviews and continuous improvement

• 3–5 years of experience in software engineering, with strong frontend specialization
• Proven experience in SaaS or scale-up environments
• Strong expertise in modern frontend frameworks (React preferred)
• Solid understanding of design systems and UI architecture
• Comfortable working across the stack (APIs, backend basics, system integration)
• Product-oriented mindset with a bias for action

• Experience with data-heavy or complex interfaces
• Familiarity with applications deployed outside standard cloud environments (on-prem, edge)
• Experience with TypeScript across the stack
• Exposure to DevOps or deployment pipelines
• Interest in deeptech, defense, or high-reliability systems

Frontend Craftsmanship

• Strong attention to detail and UI quality
• Ability to build scalable, reusable components

Versatility

• Comfortable stepping outside strict role boundaries
• Able to contribute across the stack when needed

Product Ownership

• Focused on delivering user value, not just features
• Pragmatic and impact-driven

Execution & Autonomy

• Thrives in small, fast-moving teams
• Takes ownership and delivers end-to-end

Technological Sovereignty

• Motivation to work on strategic, high-impact technologies in Europe