Senior Backend & Infrastructure Engineer (m/f/d)

Job Description:

Xaver is a fast-growing FinTech founded by an experienced leadership team that previously built venture-backed companies generating millions in revenue. Operating in a regulated market with over €100 billion in volume, we are backed by leading founders, experienced industry executives, and top international VCs. Our wealth manager operates as a BaFin-supervised financial institution.

Most people in Germany do not save enough for retirement, and the current system makes financial planning complex and inaccessible. At Xaver, we are building next-generation digital pension and wealth management solutions to solve this structural challenge. We partner with top-tier insurers, broker networks, and financial institutions that leverage our platform to deliver modern wealth management to their customers.

Your Role:

As a Senior Backend & Infrastructure Developer, you will play a critical role in engineering the backbone of our platform. You will be responsible for translating complex financial, insurance, and broker workflows into resilient, performant backend services and scalable cloud infrastructure.

You will work shoulder-to-shoulder with our CPTO, Product Managers, and Staff Engineers, taking technical ownership of business-critical logic and helping shape architectural decisions across our ecosystem.

Our Tech Stack

• Language & Frameworks: TypeScript, Nest.js (Next.js on the frontend)
• Databases & Caching: MongoDB, Redis
• Cloud & Infrastructure: AWS, Infrastructure as Code (IaC)
• CI/CD & Tooling: Bitbucket Pipelines, Git

Your Key Responsibilities:

• Core Business Logic: Design, build, and optimize backend domain logic handling insurance broker flows, financial calculations, portfolio operations, and consumer-facing pension transactions.
• Service Architecture & Inter-Backend Communication: Define and implement robust communication patterns between internal microservices, partner APIs, and asynchronous event streams.
• Infrastructure as Code (IaC): Own, maintain, and scale our AWS infrastructure, ensuring high availability, observability, and cost-efficiency.
• CI/CD & Automation: Evolve our Bitbucket Pipelines to ensure smooth, secure, and automated testing and deployment workflows.
• Cross-Functional Collaboration: Partner closely with Staff Engineering, Product Management, and the CPTO to refine product specs, break down complex requirements, and set technical standards.
• Security & Compliance: Build secure, auditable, and resilient systems that adhere to the high compliance and data protection standards of a BaFin-regulated financial institution.

Your Qualifications:

• Extensive Backend Experience: Proven track record in designing and maintaining production-grade backends using TypeScript and Nest.js (or modern Node.js frameworks).
• Database & In-Memory Expertise: Deep working knowledge of schema design, indexing, and query optimization in MongoDB, paired with practical caching and queueing patterns using Redis.
• Cloud & Infrastructure Fluency: Hands-on experience architecting and managing workloads on AWS using Infrastructure as Code (e.g., Terraform, AWS CDK, or CloudFormation).
• Distributed Systems Mindset: Solid understanding of inter-service communication (REST, gRPC, message brokers/event-driven architectures) and resilience patterns (circuit breakers, retries, distributed tracing).
• Domain Problem Solving: Experience translating complex real-world rules (fintech, banking, insurance, or e-commerce) into clear, testable, and maintainable domain code.
• Communication & Mindset: Collaborative attitude, pragmatic decision-making, and strong communication skills in English.
• Nice to Have: Frontend familiarity with Next.js is a welcome plus, though not a hard requirement.

Reporting to:

CPTO

Location:

Köln

What We Offer:

• High Impact: Direct co-ownership over foundational architecture in a €100B+ market with no legacy constraints.
• Direct Access to Leadership: A flat hierarchy where you collaborate daily with Staff Engineers, Product Leads, and the CPTO.
• Competitive Compensation: An attractive salary reflecting your senior experience, plus company perks.
• Modern Equipment: Latest MacBook Pro (or your choice of hardware) and productivity tooling.
• Workplace: Modern office space in central Cologne, with a flexible hybrid work model.
• Benefits & Perks:
  • Urban Sports Club membership subsidy
  • A Round-the-World flight ticket to celebrate your 4th anniversary with Xaver

Application Process:

Send us your CV and your GitHub/portfolio link (or code samples/open-source contributions) via the company link. No cover letter, photo, or date of birth required.