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

Susquehanna International Group, LLP•Bala Cynwyd (Philadelphia Area), PA

158d•Onsite

About The Position

Susquehanna is seeking a Senior Software Developer to join their HR Technology & Shared Services development team. This specialized engineering group is 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 are important. The team designs and builds internal platforms that integrate with best-in-class third-party systems (UKG, ADP, payroll, compliance, and others) and develops 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.

Requirements

Bachelor’s degree in Computer Science, Engineering, Mathematics or a related discipline. Relevant experience can be substituted for education.
10+ years of hands-on software development experience
Strong proficiency in C# or Java
Experience with SQL, Web Development, and API-driven architectures
Experience working with AI-assisted tooling (Copilot, Cursor, Claude Code, etc.)
Interest in understanding systems beyond code — including deployment, data flow, and reliability
Strong collaboration and communication skills across technical and non-technical teams

Nice To Haves

Any experience deploying solutions using AI for inference is a plus

Responsibilities

Build solutions leveraging LLMs running on our on-prem GPU infrastructure
Design and build secure, scalable applications supporting critical business functions
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
End-to-End Ownership: Engineers contribute across application, integration, and infrastructure layers.
Security-Focused Engineering: Systems support highly sensitive data (e.g., compensation, performance, firm-wide workflows) and are designed with strict isolation and reliability standards.
Complex Systems Environment: Multiple integrations, diverse data flows, and enterprise-scale workflows require thoughtful system design and strong engineering fundamentals.
Firm-Wide Impact: The platforms built by this team directly support critical operational functions across Susquehanna.