System Engineer

About Us

Cleverbridge is the smarter way to sell globally. As a premium Merchant of Record (MoR), we simplify global software sales by combining powerful platform capabilities — including payments, subscriptions, taxes, and compliance — with expert services that fuel growth across the entire customer lifecycle. From onboarding and implementation to ongoing optimization and strategic guidance, our team works as an extension of our clients', helping them remove friction, reduce risk, and expand into new markets with confidence.

About The Role

This role focuses on maintaining, stabilizing, and modernizing a large monolithic backend platform built on .NET technologies. The position plays a key role in ensuring the reliability and long-term maintainability of the system while gradually modernizing legacy components and improving development practices.

The role involves working within a large and established codebase, introducing improvements and new functionality while preserving the stability of the production platform. In addition to backend services and database integrations, the role also includes maintaining a Windows-based WPF application used internally for operational workflows.

Success in this role requires strong ownership of existing systems, pragmatic technical decision-making when evolving legacy architectures, and the ability to balance ongoing maintenance with incremental modernization efforts.

Key Responsibilities

• Maintain and enhance a large monolithic backend platform implemented in C# and .NET.
• Work effectively within a large, established codebase and introduce changes without disrupting the stability of the running platform.
• Maintain and improve existing monolithic services while contributing to the gradual extraction of components into cloud-based services.
• Modernize legacy .NET Framework components by migrating them to modern .NET versions while minimizing regression risk.
• Refactor and improve existing codebases to increase maintainability, stability, and long-term sustainability.
• Design, implement, and maintain REST APIs used by internal and external consumers.
• Implement and maintain GraphQL APIs, including schema design, resolvers, and safe evolution of schemas over time.
• Integrate third-party APIs and external systems into the platform.
• Maintain and support an existing Windows desktop application built with WPF.
• Develop and optimize Oracle SQL queries and database interactions, ensuring performance and data consistency.
• Investigate and resolve production issues, perform root-cause analysis, and implement long-term fixes.
• Improve development and delivery workflows through CI/CD pipelines and automated build and deployment processes.

Qualifications

Required

• Strong experience with C# and modern .NET development.
• Experience maintaining and evolving large legacy or monolithic systems.
• Practical experience migrating applications from .NET Framework to modern .NET versions.
• Experience designing and maintaining REST APIs.
• Experience implementing and maintaining GraphQL APIs (schema design, resolvers, query performance).
• Strong SQL skills, preferably with Oracle databases.
• Experience maintaining Windows desktop applications using WPF.
• Familiarity with Git-based development workflows and collaborative code review practices.
• Experience with CI/CD pipelines and automated build and deployment processes.

Preferred (Optional)

• Experience with AWS cloud services and serverless architectures (API Gateway, Lambda, IAM, EventBridge, SQS).
• Infrastructure-as-code experience using Terraform or Terragrunt.
• Experience with gradual system modernization and legacy refactoring strategies.
• Experience improving observability through logging, monitoring, and operational tooling.
• Experience optimizing application and database performance in production environments.

Key Competencies

• Strong analytical problem-solving skills in complex legacy environments.
• Pragmatic approach to system modernization and technical debt reduction.
• Clear technical communication and structured documentation.
• Ownership mindset with focus on reliability and operational stability.
• Ability to balance maintenance work with incremental improvements.
• Collaboration and constructive code review behavior within engineering teams.
• Planning discipline and delivery focus within Jira and CI/CD workflows.

Benefits of working at Cleverbridge

Flexible work options

Work hybrid or fully remote with flexible hours (varies by role and team)

Inspiring office environments

Collaborate in modern offices in the heart of Cologne and Chicago

Health & well-being

Get gym reimbursement, join wellness challenges, and access other health benefits

Learning & development

Grow your skills with structured programs and a personal L&D budget

Employee support programs

Access 401(k), pension plans, volunteer time off, mentoring, and more

Referral program

Earn cash bonuses when your referrals join the Cleverbridge team

Cleverbridge is committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity Employer, making decisions without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability status, age, marital status, protected veteran status, or any other protected class.

At Cleverbridge, we believe in our people and their abilities to drive impact. That's why we offer a competitive salary, flexible working environment, and opportunities for growth and advancement. If you're ready to take the next step in your career, we want you on our team! Apply now and let's build something amazing together.

Still have questions?

Get in touch with us! Whether it’s a role-specific question or a question about life at Cleverbridge, we would love to chat with you and will do our best to respond as quickly as possible.