Senior Backend Engineer (m/f/d)

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.

We’re looking for an experienced Senior Backend Engineer (m/f/d) to be a technical anchor across the team at our Ecosystem Company.

You will operate with a high degree of autonomy while staying deeply embedded in collaborative engineering culture.

Tech Stack: Java 21 (Spring Boot 3), Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript, Next.js, React.

Join the A11 Ecosystem – 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.

In this role, you’ll

Take ownership of complex backend systems from design through production — including architecture, implementation, and long-term maintenance
Lead technical discussions, drive engineering decisions, and document trade-offs clearly for the team
Mentor junior and mid-level engineers through code reviews, pairing sessions, and structured feedback
Identify systemic weaknesses in our infrastructure, propose improvements, and execute on them with minimal direction
Collaborate across engineering, product, and data to align technical direction with business goals
Drive improvements to observability, reliability, and performance across our backend stack
Contribute to hiring by participating in technical interviews and helping define the engineering bar

Your Profile

7+ years of backend engineering experience, with a track record of owning critical systems in production

Deep expertise in Java (Spring Boot) and strong familiarity with Python; comfortable navigating a polyglot codebase

Proven experience designing distributed systems — event-driven architecture, microservices, data pipelines

Strong command of PostgreSQL and experience working with cloud-native infrastructure on AWS

Someone who has been through hypergrowth or scale challenges and has the scars and instincts to show for it

A multiplier: you make the engineers around you better through your presence, feedback, and technical clarity

Comfortable operating in ambiguity — you can shape requirements, not just execute on them

Please note that we are looking for support in the Berlin office of our client.

Benefits and Perks

Fulfil a role with entrepreneurial freedom and take a pre-validated business model to the next level

Join an experienced founding team of serial and 2nd-time founders

Attractive base and bonus compensation program

Collaboration with top-tier investors and angels (incl. various unicorn founders) as well as leading market experts

If you’re eager to join the A11 Ecosystem and shape what’s next, we want to hear from you!

Our Commitment to Diversity and Inclusion

A11 is committed to diverse and equal opportunities hiring for all – applicants, candidates, and employees alike. We value humans – with all our glorious multifaceted backgrounds, perspectives, and experiences – and look forward to your application.