---
title: 'Backend Engineer - FinTech (m/f/d) at A11'
canonical: 'https://feeny.ai/job/backend-engineer-fintech-m-f-d-a11-berlin-nendqntx423m'
type: 'job'
last_seen: '2026-09-15'
---

# Backend Engineer - FinTech (m/f/d) at A11 

- **Company:** A11 
- **Location:** Berlin, Germany
- **Posted:** 2026-04-20
- **Last confirmed live:** 2026-09-15
- **Apply:** https://job-boards.greenhouse.io/projectaservicesgmbhcokg/jobs/8514642002

## Job description

## About the Job

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 Backend Engineer (m/f/d) to work on the backend infrastructure that handles payments, financial data, reconciliation, and compliance-critical workflows — systems where correctness and auditability are non-negotiable.

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:

- Design and implement backend services for payment processing, invoicing, reconciliation, and smart financial reporting
- Build robust, auditable data pipelines that ensure accuracy and traceability across all financial operations
- Develop and maintain integrations with payment gateways, banking APIs, and financial data providers
- Enforce data integrity standards and implement patterns for idempotency, retry logic, and failure handling in financial flows
- Collaborate with compliance and product teams to translate regulatory requirements into technical implementation
- Contribute to fraud detection logic, rate limiting, and access control mechanisms that protect financial operations
- Own incidents end-to-end — investigate, resolve, and drive post-mortems to improve system reliability

Tech Stack: Java 21 (Spring Boot 3), Python, PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript

Your Profile:

- 5-7+ years of backend engineering experience, with meaningful exposure to FinTech, payments, or financial data systems
- Strong proficiency in Java (Spring Boot) with a deep understanding of transactional systems and data consistency
- Solid experience with PostgreSQL, including schema design, indexing, and query optimization for financial data
- Experience integrating with payment processors (Stripe, Adyen, or similar) or open banking APIs
- High ownership mindset — you care about correctness as much as you care about delivery speed
- Calm under pressure, structured in your thinking, and rigorous in your testing practices

Please note that this position is based onsite in Berlin.

Benefits and Perks:

- Real ownership from day one – shape operational processes in a fast-scaling, AI-first company
- Learn from the best – work directly with senior operators
- Competitive compensation – attractive base salary and performance-based bonus program
- Personal growth & visibility – rapid learning opportunities, cross-functional exposure, and early leadership potential in a growing global team
- Vibrant company culture – modern Berlin office, monthly All-Hands, team events, and regular offsites

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.

## About A11 

## Company Overview
- **One-liner**: A11 is an execution engine that scales Europe’s fastest-growing tech companies by embedding expert operators across marketing, sales, data, engineering, and people operations.
- **Entity Type**: Private (Services Firm / Venture Builder)
- **Headquarters**: Berlin, Germany (Julie-Wolfthorn-Straße 1, 10115 Berlin) [a11.com](https://www.a11.com/imprint)
- **Founded**: Not publicly available
- **Founders**: Rainer Berak, Stephan Schulze, Thuy-Ngan Trinh [a11.com](https://www.a11.com/imprint)

## Core Business
- **Primary industry**: Tech consulting / operational scaling / venture building
- **Target customers**: B2B – fast-growing tech companies, unicorns, and pre-seed startups in Europe
- **Mission**: “Build the next billion” – helping companies reach billion-dollar valuations through embedded operational expertise [a11.com](https://www.a11.com/careers)

## Products & Services
A11 provides hands-on, embedded services across multiple domains, delivered by a SWAT team of operators:

- **Growth Marketing & GTM**: Launching products at speed, reducing customer acquisition costs (e.g., helped Trade Republic acquire its first million customers in six months) [a11.com](https://www.a11.com/)
- **Sales**: Account executives, sales development, and go-to-market strategy for DACH and beyond
- **Data & Analytics**: Data engineering, data science, BI & analytics to drive decision-making
- **Engineering & Technology**: Backend engineering, AI agents/workflows, CTO-as-a-service, and team scaling (e.g., scaled Sennder’s tech team from 25 to 145 people in 12 months) [a11.com](https://www.a11.com/)
- **People Operations & Talent**: Recruiting, talent management, and headcount scaling (e.g., built ARX’s robotics & AI team from scratch, hiring 45 employees in 12 months) [a11.com](https://www.a11.com/)
- **Finance & Strategy**: CFO services, accounting, procurement, and EBITDA improvement (improved EBITDA of multiple PE investments by >30% without headcount reduction) [a11.com](https://www.a11.com/)

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metric**: Total team size of ~83–90 employees (as of mid-2026) [theorg.com](https://theorg.com/org/a11)
- **Notable Clients/Proof Points**:
  - **Trade Republic**: Delivered first million customers in six months; Trade Republic now valued at €12.5B, one of Europe’s eight decacorns [a11.com](https://www.a11.com/)
  - **Sennder**: Scaled tech team from 25 to 145, increased deployment efficiency by 85%; Sennder is now a unicorn with €1.4B revenue [a11.com](https://www.a11.com/)
  - **ARX Robotics**: Built robotics & AI team from scratch (45 hires in 12 months); closed €9M seed and €31M Series A with backing from the NATO Innovation Fund [a11.com](https://www.a11.com/)
- **Growth Signals**: Actively hiring for 39 open roles across Berlin, Düsseldorf, and Bielefeld, including senior leadership positions (CTO, CFO, VP Product) [greenhouse.io](https://job-boards.greenhouse.io/projectaservicesgmbhcokg/jobs/8583403002)

## Competitive Advantages
- **SWAT team model**: Operators embed directly inside client companies, driving change from the inside rather than offering external advice.
- **Proven track record**: Multiple companies taken from pre-seed to billion-dollar valuations – “zero to one billion” [a11.com](https://www.a11.com/)
- **Operational excellence**: Focus on measurable outcomes (e.g., EBITDA lift, deployment efficiency, customer acquisition cost reduction).
- **Culture**: “No Assholes Allowed” and “We Play to Win” – a high-performance, low-ego environment that attracts top talent. [a11.com](https://www.a11.com/careers)

## Strategic Focus
- **AI enablement**: Hiring a Chief of Staff – Strategy & AI Enablement and AI Product Leads, indicating a push to embed AI capabilities across client operations. [greenhouse.io](https://job-boards.greenhouse.io/projectaservicesgmbhcokg/jobs/8583403002)
- **Ecosystem expansion**: Building a network of portfolio companies and partners; the careers page lists “Ecosystem” roles alongside A11 internal roles. [a11.com](https://www.a11.com/careers)
- **Continued scaling**: Growing the team rapidly to meet demand from Europe’s tech unicorns.

## Why Work Here
- **Culture**: Smart, humble people who back each other to win. Explicit “No Assholes Allowed” policy. High autonomy and ownership. [a11.com](https://www.a11.com/careers)
- **Impact**: Work directly with Europe’s most valuable startups and scale-ups (Trade Republic, Sennder, ARX) – your work drives real business outcomes.
- **Roles**: Diverse opportunities across engineering, data, product, sales, marketing, finance, and people ops – both in A11’s core team and within its client ecosystem.
- **Location**: Based in Berlin with additional offices in Düsseldorf and Bielefeld. Hybrid/office policy not explicitly stated, but roles are listed with city locations.
- **Engineering culture**: Strong emphasis on backend engineering, AI, and data; CTO and senior engineering roles available. [greenhouse.io](https://job-boards.greenhouse.io/projectaservicesgmbhcokg/jobs/8583403002)

## Sources
1. [a11.com](https://www.a11.com/) – Company overview and client case studies
2. [a11.com/careers](https://www.a11.com/careers) – Careers page with values and open roles
3. [theorg.com](https://theorg.com/org/a11) – Org chart and employee count
4. [greenhouse.io](https://job-boards.greenhouse.io/projectaservicesgmbhcokg/jobs/8583403002) – Job listings and role descriptions
5. [a11.com/imprint](https://www.a11.com/imprint) – Legal entity and founders

## Other roles at A11 

- [Information Security Manager (m/w/d)](https://feeny.ai/job/information-security-manager-m-w-d-a11-berlin-gg5jcchdy0m9) — Berlin, Germany
- [Sales Manager - New Business  (DACH) (m/f/d)](https://feeny.ai/job/sales-manager-new-business-dach-m-f-d-a11-berlin-ja3y64vrvm1n) — Berlin, Germany
- [Account Executive (DE) (m/f/d)](https://feeny.ai/job/account-executive-de-m-f-d-a11-berlin-rt6pc8m440nk) — Berlin, Germany
- [Founding Engineer (m/f/d)](https://feeny.ai/job/founding-engineer-m-f-d-a11-berlin-9g8janzyxyb0) — Berlin, Germany
- [GTM Engineer (m/f/d)](https://feeny.ai/job/gtm-engineer-m-f-d-a11-berlin-c81nytdbph2e) — Berlin, Germany
- [Junior Sales Manager (m/f/d)](https://feeny.ai/job/junior-sales-manager-m-f-d-a11-hamburg-0nm9a0b0e60b) — Hamburg, Germany
- [Growth Associate (m/f/d)](https://feeny.ai/job/growth-associate-m-f-d-a11-hamburg-6yf5aqkghr32) — Hamburg, Germany
- [IT Compliance Manager (m/w/d)](https://feeny.ai/job/it-compliance-manager-m-w-d-a11-berlin-vtcpaqnjrk8f) — Berlin, Germany
- [Sales Associate (m/f/d)](https://feeny.ai/job/sales-associate-m-f-d-a11-hamburg-k62seesegged) — Hamburg, Germany
- [Growth Associate Intern (m/f/d)](https://feeny.ai/job/growth-associate-intern-m-f-d-a11-hamburg-s3enrhh1yr10) — Hamburg, Germany