Senior Software Developer | HR Technology & Shared Services | Experienced Hire

Susquehanna International Group, LLP

45d • Onsite

About The Position

Susquehanna is seeking a Senior Software Developer to join our HR Technology & Shared Services development team, a specialized engineering group responsible for building secure, scalable, and business-critical platforms that support enterprise functions across the firm.
This is a full-stack engineering role within a high-performance quantitative trading firm, where precision, security, and craftsmanship matter. The team designs and builds internal platforms that integrate with best-in-class third-party systems (UKG, ADP, payroll, compliance, and others) while also developing custom solutions that cannot be purchased off the shelf.
The group operates a dedicated on-premises hardware environment to support systems responsible for highly sensitive firm data. As a Senior Developer, you will work end-to-end — from architecture and application design to deployment and operational support — in collaboration with experienced engineers and cross-functional stakeholders.
End-to-End OwnershipEngineers contribute across application, integration, and infrastructure layers.
Security-Focused EngineeringSystems support highly sensitive data (e.g., compensation, performance, firm-wide workflows) and are designed with strict isolation and reliability standards.
Complex Systems EnvironmentMultiple integrations, diverse data flows, and enterprise-scale workflows require thoughtful system design and strong engineering fundamentals.
Firm-Wide ImpactThe platforms built by this team directly support critical operational functions across Susquehanna.

Requirements

• Bachelor's degree in Computer Science, Engineering, Mathematics or a related discipline. Relevant experience can be substituted for education.
• 7+ years of hands-on software development experience
• Strong proficiency in C# or Java
• Experience with SQL, Web Development and API-driven architectures
• Interest in understanding systems beyond code — including deployment, data flow, and reliability
• Strong collaboration and communication skills across technical and non-technical teams

Responsibilities

• Design and build secure, scalable applications supporting critical business functions
• Develop backend services in C# or Java
• Architect and maintain integrations across enterprise systems (HR, payroll, compliance, compensation)
• Build internal tools and platforms where commercial solutions do not meet business needs
• Work across the full SDLC: architecture → development → deployment → monitoring
• Contribute to a dedicated on-premises infrastructure environment
• Collaborate with engineers, analysts, and system owners to translate complex requirements into production-ready systems
• Support initiatives involving internal AI capabilities powered by on-prem GPU infrastructure

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level