Python Backend Developer (f/m/d)

Epassi’s purpose is to boost everyday well-being. We are a leading provider of employee benefit solutions in Europe. We were established in Finland in 2007, and in 2008 we were the first company to launch a mobile-payable employee benefit payment solution in Europe. Since then, we have consistently grown, diversifying our products and introducing our services into new markets. Epassi has been awarded by the Financial Times as one of the fastest-growing companies in Europe on multiple occasions.

Python Backend Developer

Your mission at Epassi

Your mission as a Python Backend Developer is to ensure our platform and processes scale efficiently for the upcoming customer migration. You will identify and mitigate scaling issues, map existing customer configurations to our system equivalents, and help build automation that supports reliable, high-performance migrations and long-term platform growth.

Your Responsibilities will be

• Proactively map components known to be susceptible to scaling issues (e.g., slowness, lack of async processing) and propose effective improvements.
• Analyze customer settings including employees, invoicing, and integrations - and map them to new equivalents to inform automation strategies.
• Own the design and implementation of the self-service customer portal backend (REST API).
• Maintain and improve our cloud infrastructure, including Kubernetes EKS and PostgreSQL RDS.
• Develop, optimize, and maintain CI/CD pipelines using GitHub Actions and related tools.
• Integrate with third-party HR APIs to provide seamless data flows.
• Work closely with Product Owners to define, scope, and deliver high-impact features.
• Support internal stakeholders (Customer Success, Operations) to ensure smooth workflows.
• Expand and improve our existing transactional system.

What You’ll Be Doing (daily)

• Designing, implementing, and maintaining backend services and REST APIs that support scale and performance.
• Monitoring and improving infrastructure reliability, performance, and scalability.
• Building and managing CI/CD pipelines to streamline development and deployment.
• Troubleshooting and resolving technical challenges proactively.
• Collaborating with engineering and product teams to deliver high-quality features.

What You Should Bring

• 5+ years of professional Python experience working with complex codebases.
• Hands-on experience with Python web frameworks (FastAPI, Django, or Flask).
• Strong knowledge of AWS services, Kubernetes, and PostgreSQL.
• Solid understanding of relational databases and SQL query optimization.
• Experience working with CI/CD pipelines and tooling (e.g., GitHub Actions, CircleCI, GitLab CI).
• Strong testing mindset with experience in testing frameworks such as pytest.
• A proactive, hands-on approach to problem-solving.
• Experience taking projects from design to delivery, including architectural decision-making.

Your track record

• Successfully delivered end-to-end backend projects.
• Actively improved engineering standards and practices in past roles.
• Known for taking initiative and improving existing systems where possible.
• Comfortable working independently and collaborating within a team.

Your language profile

• Good command of written and spoken English.

Why you should work with us

• Impact at scale: You’ll work on a mission-critical project that directly contributes to successful customer migrations and platform growth.
• Growth & development: Take ownership, drive improvements, and grow your skills in a supportive environment.
• Flexible work model: Hybrid/remote setup with a collaborative, balanced work culture.
• Modern tech stack: Work with cloud-native infrastructure, CI/CD automation, and integrations with third-party services.
• Collaborative culture: Be part of a team that values initiative, quality engineering, and continuous improvement.