Senior Software Engineer (m/f/d)

At **Credibur**, we are building a debt management platform for non-bank lenders that must work reliably under real operational pressure. As our customer base and data volume grow, the hard problems are no longer features, but correctness, performance, and robustness.

We are looking for an **experienced backend-focused Software Engineer** (m/f/d) who helps us stabilize and scale our core systems without unnecessary complexity.

This role is about building practical, reliable solutions to real-world problems.

Our hiring process includes a **live coding session without AI assistance**.

## Tasks

• **Own backend robustness:** Improve and maintain core backend components with a focus on correctness, performance, and long-term maintainability
• **Solve complex business logic:** Identify and fix edge cases caused by heterogeneous customer data and evolving requirements
• **Improve database performance:** Analyze and optimize slow queries, data access patterns, and schema decisions as data volume increases
• **Build pragmatic solutions:** Extend existing systems carefully, choosing simplicity over premature optimization & abstraction
• **Collaborate on operations where it matters:** Contribute to infrastructure, CI/CD, observability, and deployment improvements that directly impact backend stability and scalability
• **Work closely with the team:** Collaborate with other engineers and product to turn real operational needs into reliable backend behavior

## Requirements

• Proven experience as a **Senior Software Engineer**
• 2+ years of experience with **Python** in production systems
• 2+ years of experience with **Django**
• Strong **problem-solving skills**
• Hands-on experience with PostgreSQL, including data modeling and query optimization
• Experience designing and implementing **RESTful APIs**
• Proficient with **Git** and collaborative workflows (feature branches, pull requests, code reviews)
• Experience writing **automated tests** to ensure reliability and prevent regressions
• Ability to make pragmatic technical decisions, avoiding overengineering while maintaining high standards
• Experience working with **AWS ECS** and containerized deployments in production environments
• Clear, collaborative communication in English
• **Nice to have:** Prior exposure to financial or data-heavy systems
• **Core hours:** 10:00 to 16:00 CET

**What We Offer**

🚀 **Early-stage fintech startup**

Work close to the product, the problems, and the decisions that shape the company

📈 **High-impact, visible work**

Your work directly affects platform stability, scalability, and how we grow

💬 **Feedback as dialogue, not one-way input**

We use retrospectives and reviews to openly discuss what worked, what caused friction, and how to improve collaboration and handovers together

🌱 **Real focus on development**

Regular development talks, documented progress, and concrete next steps to support your growth

🌍 **Flexible work setup**

Remote within Europe, with clear expectations around collaboration

✍️ **Flexible contract model**

Freelance option available for candidates outside Germany. No agencies

💰 **Competitive compensation**

Based on experience, responsibility, and impact

At Credibur, we believe that **diverse teams build better products**. We welcome applications from people of all backgrounds, regardless of **gender, age, ethnicity, disability, sexual orientation, or religion**. If you’re passionate about what we do but don’t meet 100% of the criteria, we still encourage you to apply - we value potential and ambition.

**All hires complete on-site onboarding in Berlin. Background checks are required as part of our standard compliance process.**