Senior Software Engineer - Transactions

About the Role Senior Software Engineer to join the Transactions & Private Debt product area and contribute to business-critical functionality used by clients in daily investment operations. You will work as part of an experienced engineering team, contributing to backend development, component design, performance, reliability and maintainability. Most product logic is written in APL, while we are increasing our use of C#/.NET in new development, integrations, cloud enablement, and platform modernization. You do not need prior APL experience; we will provide training and support and we are looking for someone who is curious to learn what is needed while bringing strong engineering practices from C#/.NET.

What You'll Do

• Design, implement, test and maintain backend functionality using APL and, where relevant, C#/.NET.
• Contribute to component design, code quality, performance and long-term maintainability.
• Work closely with product managers, engineers and other stakeholders to understand requirements and deliver client-relevant functionality.
• Improve reliability and delivery through code reviews, automated testing, CI/CD and pragmatic engineering practices.
• Investigate technical issues, performance bottlenecks and bugs and help design sustainable solutions.
• Share knowledge with colleagues and contribute to technical discussions within the team.

What We're Looking For

• Bachelor’s degree in computer science, information technology, or a related field.
• Solid experience with C#/.NET and backend development.
• Good understanding of object-oriented design, clean code, APIs, and integration patterns.
• Experience with automated testing, code reviews, CI/CD, and Git-based workflows.
• Ability to work with complex business logic and collaborate with both technical and non-technical colleagues.
• Interest in learning APL. Prior APL experience is not required.
• Experience with Azure or cloud-based development is an advantage, but not a prerequisite.

Nice to Have

• Experience from fintech, financial services or another regulated industry.
• Exposure to functional, array-oriented or vector-based programming languages.
• Experience with Azure services or cloud-based development.
• Experience mentoring other engineers or taking ownership of a component.

Compensation & Benefits

• Compensation ranges are being disclosed at the initial stage of candidate engagement.
• Flexible working hours and hybrid model - 2 days in the office, 3 days remote.
• Modern office (next to Wilanowska metro station) with quiet zones and ergonomic workstations.
• Base salary with annual bonus structure.
• Holiday allowance upon a 2-week vacation.
• Occasional remote work across Poland and international options available (up to 24 days domestic, 20 days international per year - subject to internal policy).
• Employer-paid Medicover Platinum healthcare package (employee-paid family upgrade available).
• Multisport card with 75% employer contribution.
• Unum group life insurance (employee-paid upgrade available).
• Medicover travel insurance for private trips and global business travel insurance.
• Possibility to join Deutsche Börse Group Share Plan (eligible after 1 year).
• Copyrights program for certain roles.
• Possibility to develop your career in an international environment.
• Professional training and courses provided by SimCorp.
• Polish language classes for foreign employees; German and English classes based on business needs.
• Integration events, volunteering initiatives and employee-led clubs.