Senior Backend Engineer (m/f/d)

<h2><strong>About the Job</strong></h2> <p>As a key growth accelerator, A11 partners with Europe’s most ambitious startups and scaleups, corporates, and SMBs to connect them with top-tier talent ready to make an impact.</p> <p>We’re looking for an experienced Senior Backend Engineer (m/f/d) to be a technical anchor across the team at our Ecosystem Company.&nbsp;</p> <p>You will operate with a high degree of autonomy while staying deeply embedded in collaborative engineering culture.</p> <p><strong>Tech Stack:</strong> Java 21 (Spring Boot 3), Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript, Next.js, React.</p> <p><strong>Join the A11 Ecosystem – </strong>A next-generation supply chain platform, the company is redefining how one of the world’s largest industries sources, distributes, and finances materials. Engineered to unlock the full potential of global trade, it harnesses agentic AI and workflow automation to provide seamless, high-efficiency access to premium materials at scale. Since its commercial rollout, the platform has fueled exponential growth, optimizing procurement for thousands of businesses while setting new benchmarks for speed, transparency, and efficiency. Its competitive edge lies in full digitization and AI-driven supply chain management automation, eliminating inefficiencies and creating a direct, intelligent bridge between suppliers and buyers. With a team of 80+ FTEs across Europe (Berlin HQ), China, and India, the company is rapidly scaling toward profitability, driving triple-digit million GMV, and setting new industry standards in autonomous, AI-powered supply chain orchestration.</p> <h2><strong>In this role, you’ll:</strong></h2> <ul> <li>Take ownership of complex backend systems from design through production — including architecture, implementation, and long-term maintenance</li> <li>Lead technical discussions, drive engineering decisions, and document trade-offs clearly for the team</li> <li>Mentor junior and mid-level engineers through code reviews, pairing sessions, and structured feedback</li> <li>Identify systemic weaknesses in our infrastructure, propose improvements, and execute on them with minimal direction</li> <li>Collaborate across engineering, product, and data to align technical direction with business goals</li> <li>Drive improvements to observability, reliability, and performance across our backend stack</li> <li>Contribute to hiring by participating in technical interviews and helping define the engineering bar</li> </ul> <h2><strong>Your Profile</strong></h2> <ul> <li>7+ years of backend engineering experience, with a track record of owning critical system