Senior Software Engineer (m/f/d)

A11 is the execution engine behind Europe’s top tech unicorns like Trade Republic, Sennder and Kry. We are a SWAT team for business performance in different expertise areas ranging from Marketing, Sales, Data, Tech to People Ops. With 100+ international experts, we step in with tactical precision to tackle complex challenges across business and tech. From launching products at speed to reshaping entire business models, we deliver impact.

About the Job

We're looking for driven and impactful Software Engineers (m/f/d) to join our Engineering team.

Alongside our client work, we are building Lumarc: an AI decision engine that brings together company data, recommends the best course of action and carries it out.

In your day-to-day work, you'll build with agentic, AI-assisted development as the default way of working, always with a pragmatic mindset, a keen eye for quality and a collaborative spirit. You'll join a small, senior team with real clients from day one.

We're hiring across two tracks that share the same foundation and can overlap in practice

• Core Engineer: you build the product itself, platform and architecture work, agentic systems, with a small team where anyone can pick up any task.
• Forward Deployed Engineer (FDE): you work hands-on with client teams on various different projects, take what the core product offers, and build the customization on top. The work is technical and client-facing, requires adapting quickly to systems you haven't seen before, and feeds learnings back into the core product.

If you lean towards the Core Engineer role, you'll be

• Owning architecture and technology choices for AI-native, agentic products, from the whiteboard to production
• Building data pipelines, workflow automation and system integrations that turn messy client data into clean, usable flows
• Building and shipping features across frontend and backend, and owning the infrastructure, CI/CD and hosting that make the platform repeatable across clients
• Building and refining the first product surfaces (such as rapid UI prototypes) end to end, deciding when a prototype is solid enough to productionize

If you lean towards the FDE role, you'll be

• Design, plan and implement business-critical, performant and accessible user interfaces with our clients
• Enhance the usability and user experience of existing applications by developing new features
• Advise engineering teams on the architecture and technology choices for their websites and web applications
• Working one-to-one with client teams to understand their systems, data and ways of working, including running workshops to surface implicit, undocumented knowledge
• Building the client-specific customization on top of what the core product already offers
• Translating what you learn on-site into input for the core team, so patterns that repeat across clients can be built once
• Explaining the product in a technical, consultative way (not a sales pitch) and travelling to client sites for workshops as needed

Your Profile

• Hands-on software engineering background with real shipping experience (products, MVPs or proofs of concept), not only maintenance work
• Practical experience with AI/LLM systems in production, such as agent orchestration, tool-calling, integrations or applied AI/LLM features, not only side projects or tutorials
• Knowledge of Python or TypeScript (or another object-oriented language)
• A get-things-done mindset: you ship and don't wait for perfect specs
• Comfort with ambiguity and open-ended work; you think in products, not tickets
• High agency: you take initiative, make decisions with confidence, and go beyond your role to ensure success
• Ability to effectively convey technical concepts to team members and stakeholders in a business-friendly way
• A team player who prioritises shared goals, shares credit and collaborates across disciplines
• Openness to feedback and adaptability in a fast-changing environment
• C2 in German for FDEs & proficiency in English for both core engineers and FDEs
• If you lean towards the FDE role: comfort with people-facing work (workshops, client conversations) and willingness to travel to client sites

Please note that this position is based in Berlin.

Why Join A11

• Shape the Future of Innovation: Take the lead on game-changing projects across a diverse range of companies and geographies. You'll make a true impact through our strategic and hands-on working style.
• Collaborate with an International Team of Digital Natives: Unlock new opportunities to learn, contribute, and thrive in a dynamic, multicultural environment. Our Team represents over 25 nationalities and brings experience in a wide range of companies and industries.
• Career Development: We support growth in every direction—whether you want to deepen your expertise, lead a department or explore new areas.
• Embrace Change and New Technologies: We actively try out new tools and AI features to optimise our workflows and processes, giving you creative freedom and autonomy to reach your goals.
• Exchange and Discover: From shared meals with the Team to fun offsites to frequently hosted meetups, you'll build lasting connections through regular events and dynamic knowledge-sharing opportunities.

If you’re looking to accelerate growth and generate high impact, we want to hear from you!

Our Commitment to Diversity and Inclusion

A11 is committed to diversity and equal opportunities for all – applicants and employees alike. We value humans – with all our glorious multifaceted backgrounds, perspectives, and experiences. Our diverse team has different ethnic and cultural origins, gender identities, sexual orientations, family arrangements, religious and political affiliations, socioeconomic statuses, age groups, and abilities.