Startup Job / Mitgründer / Praktika: Senior Product Engineer Full-Stack

(m/w/d) -

Die Beschreibung: Senior Product Engineer Full-Stack als Startup Full-Time Job

We maximize product availability with minimal cashflow investment in 1/10 of the time. We solve a real problem for SMEs. With AI.

VOIDS is the leading forecasting and inventory management software solution for D2C brands. The VOIDS platform automates accurate product-level demand forecasting to proactively identify risks such as inventory inefficiencies (e.g., out-of-stocks) and take recommended actions to eliminate them before they occur. We help e-commerce brands achieve 98% inventory efficiency, 20x ROI, and six-figure cash profits in a matter of weeks. 50+ success stories, including FC Bayern, 6pm, Rosental, and Blackroll confirm this. Since our product launch in June 2023, we’ve achieved approximately 300% growth over the past year, and we’re now positioned to double our ARR by the end of 2025.

At VOIDS, you'll find a game-changing personal growth opportunity if you are driven, fast-paced, and passionate about challenging the status quo. Embrace the opportunity to take direct ownership of scaling our AI platform's success. Work alongside the team and co-founders Jannik and Tobias, who bring a wealth of experience in e-commerce growth and AI-based demand forecasting.

What you'll do

As a Senior Product Engineer (Fullstack), you will own features from end to end. Starting with customers’ challenge, you will iterate on different ideas and ship features to production. Our daily challenge is that our customers require an easily digestible UI/UX for making complex decisions, while the datasets behind it are large and complex. We need to think two steps ahead and break down the complexity into actionable, easily understandable UI.

• Lead feature development that directly impacts customer success
• Engage actively with customers to deeply understand their needs and feedback
• Collaborate closely with the CEO, CTO, sales, and engineers
• Identify and implement technical enhancements for scalability and performance
• Improve the overall developer experience and tooling
• Actually get things done, deciding yourself what to focus on—without bureaucracy

Must-Have Skills

• Speak English fluently, German is a plus
• Have clear and professional communication skills (incl. async)
• 5+ years of experience as Frontend/Backend/Full-stack engineer
• Having worked with TypeScript for 2+ years in production
• Have hands-on experience SQL databases, ideally PostgreSQL
• Strong product intuition and an ownership mindset
• Track record of shipping and improving things that matter
• Care deeply about user experience and know when to optimize for speed versus long-term code maintainability
• You are comfortable with ambiguity & can solve problems autonomously

Bonus / Nice-to-Have

• An eye for UX and UI, especially for data-heavy interfaces
• Experience in eCommerce and/or B2B SaaS, building dashboards or data visualizations
• DX improvements or tooling you’ve driven in past roles
• Exposure to Python-based data processing pipelines (e.g., pandas)
• Experience with infra frameworks, such as Terraform, Kubernetes & co.

Tech Stack

Our app is built with a TypeScript-based stack:

• Frontend: TypeScript, Next.js 15, TailwindCSS, shadcn/ui
• Backend: Next.js (fullstack), migrating from NestJS
• Database: PostgreSQL with Drizzle ORM
• Infra: Vercel
• AI Tools: GitHub Copilot, ChatGPT, v0.dev (used daily)

What Success Looks Like (First 3 Months)

• You’ve gained a solid understanding of the product and the data behind it
• You’ve shipped a larger feature that’s already in customers’ hands
• You’ve found and delivered a technical improvement that made dev or user life better
• You’ve built first relationships with customers that boost feedback cycles
• Everyone in the team knows what you are doing, and you proactively support others

How We Work

• AI-driven productivity: We actively leverage Copilot, GPT-4, and other AI tools.
• Fast-paced, high-impact, no overhead: Short daily stand-ups (15min), efficient weekly planning (30min), autonomous decisions, ship daily
• Engineering culture & values: pragmatism, simplicity, maintainability & customer focused
• 50/50 Hybrid flexibility: Mix remote work with our inspiring office in Hamburgs city center
• Continuous learning: We trust your expertise, value your ideas, and encourage proactive growth
• Autonomous decision making: We trust engineers to own their work and loop others in when needed, typically there is only lightweight consultation with the CTO and engineers

What You’ll Get

• Permanent full-time contract (no B2B)
• Competitive salary (€75,000–€95,000)
• Equity available for senior hires
• 30 days paid vacation
• New Mac Book Pro & min. 2 Monitors in the office ;)
• Regular team events and quarterly off-sites
• Real ownership and influence
• A calm, focused work environment that rewards initiative
• Wellpass membership to unlimited fitness, yoga, swimming, climbing, and more.

Hiring Process

We move fast and keep it simple.

• Initial Screening (30 min)
• Technical Interview with CTO (30 min)
• Realistic Live Coding Challenge (90 min)
• Meet the Team in Hamburg
• Offer within 2 weeks from start to decision