Founding Engineer, Systems Architect (On-Site - Berlin)

https://www.integral.de

Salary Range: €90,000 – €120,000 (Based on experience)

*Scale an AI-Powered Financial Product (Backed by €6.3M)

Integral is driven by the relentless drive for growth and deep commitment to helping small businesses succeed, co-founded by seasoned B2B entrepreneurs (Ödeal, Penta, Qonto). We recently secured €6.3 million in February 2025 to accelerate our growth and scale our existing product with paying customers.

We are looking for a Founding Engineer to serve as the key Systems Architect—a pragmatic, hands-on leader to own the scalability and feature set of our core platform. This journey requires hard work and no compromises on our ambitious vision.

Core Responsibilities: Full Ownership & High-Paced Execution

• System Architecture & Scaling: Lead architectural decisions and own the end-to-end design, development, and deployment of scalable backend systems and infrastructure to support our rapid growth.
• Full-Stack Impact: Function as the primary individual contributor across the entire stack, ensuring high-quality, deployable solutions are delivered weekly.
• Cultural Leadership (Captain/Guardian): Actively participate in our specific cycle roles to maintain focus and collective ownership:
• Captain: Periodically lead the weekly release cycle, ensuring features are on track and communicating the scope across the company.
• Guardian: Periodically serve as the designated owner of all interruptions, bugs, and urgent requests to protect the focus and productivity of the rest of the team.
• AI Integration & Feature Delivery: Demonstrate a strong ability to integrate complex AI/ML solutions into our production platform to solve domain-specific financial problems (e.g., automated document processing, classification).

Requirements:

• Founding/Principal Engineer level with 8+ years of professional software engineering experience and a proven track record of architectural leadership and 100% hands-on execution.
• Technical Breadth & Depth: Strong foundation in system design and architecture. Proficiency in multiple key technologies (e.g., Python, Node.js, Java/Kotlin, React/TypeScript).
• Commitment: Full commitment to Integral as your primary professional focus, with bandwidth for deep technical ownership.
• Culture: Alignment with our office-first culture (for essential collaboration) and relentless optimism for changing the future of business finance.
• Able to work 5 days a week on-site in Berlin.

Why Join Integral?

• Own critical systems and make high-leverage decisions at a well-funded, post-Product-Market-Fit (post-PMF) startup.
• Work directly with the Founders and an elite senior team to tackle complex challenges in finance and automation.
• Shape the engineering culture and architecture for the next phase of scaling, moving from current feature set to tackling.
• We value focused execution and pragmatic outcomes. We provide the support and resources needed to let you do your best work.