Senior Software Engineer

FactSet is seeking a highly skilled Senior Software Engineer to join our Data Access team - the single, powerful entry point to the FactSet Intelligence Platform (FIP). This is where every interaction begins: AI agents and tools, internal analytics, and client-facing APIs all connect through one unified endpoint and receive responses in a consistent, structured envelope enriched with provenance, source attribution, and entitlement transparency. Operating at the very front of FactSet's data ecosystem, you'll define this client-facing interface and orchestrate the systems behind it, delivering data with exceptional speed, security, reliability, and precision.

The platform handles immense volumes of low-latency requests, so strong engineering discipline is essential - you'll apply best practices in distributed systems, scalability, and performance to build infrastructure that is both resilient and efficient. It's a unique opportunity to shape a critical layer of FactSet's architecture, one that directly shapes the client's experience and enables the next generation of intelligent applications. If you're passionate about building high-performance systems, simplifying complex data interactions, and making a measurable impact at scale, we'd love to hear from you.

Responsibilities:

• Design, develop, and deploy the Data Access interface that defines how clients access data.
• Implement query patterns and APIs that balance flexibility, performance, and security.
• Enforce entitlements to ensure clients access only authorized data products.
• Leverage metrics and KPIs to optimize query execution, incorporating caching and performance strategies to meet client SLAs.
• Build observability into the layer - end-to-end request tracing, provenance, and source attribution surfaced in responses.
• Own Data Access products and features, driving bug fixes, performance enhancements, and scalability improvements.
• Collaborate with stakeholders and cross-functional teams to continuously improve development processes.
• Mentor junior engineers and contribute to technical design reviews and architecture decisions for the Data Access layer.
• Participate in a regional on-call rotation to support production systems.

Required Qualifications:

• Bachelor's degree or equivalent in Computer Science or related field.
• 5+ years of software engineering experience with a focus on API development, query systems, or data infrastructure.
• Strong proficiency in Python and C++, with experience building production-grade, client-facing systems.
• Solid understanding of OOP principles and software design patterns.
• Experience with API design and building orchestration layers across multiple backend systems.
• Proven ability to work independently and collaboratively, with experience leading technical initiatives.
• Passion for designing and implementing efficient, scalable, and maintainable software.

Preferred Qualifications:

• Experience with multithreaded programming, low latency, and high-availability systems.
• Knowledge of query engine architecture, parsers, compilers, and interpreters.
• Experience implementing caching strategies (Redis, Memcached) for query results and metadata.
• Experience with service-oriented architecture and microservices design.
• Understanding of distributed systems and handling failures gracefully across service boundaries.
• Experience working with large-scale data systems and balancing latency, throughput, and cost.
• Background with rate limiting, throttling, and client quota management.