Senior Software Engineer
Confirmed on the employer's own hiring board on Nov 11, 2026. First seen by Alion on Oct 22, 2026. Irwin scores A on the Alion truth index.
FactSet creates flexible, open data and software solutions for over 200,000 investment professionals worldwide, providing instant access to financial data and analytics that investors use to make crucial decisions.
At FactSet, our values are the foundation of everything we do. They express how we act and operate, serve as a compass in our decision-making, and play a big rolein how we treat each other, our clients, and our communities. We believe that the best ideas can come from anyone, anywhere, at any time, and that curiosity is the key to anticipatingour clients’ needs and exceeding their expectations.
Your Team's Impact
Python & C++ Senior Software Engineer - Data Access (FIP)
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 & 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.
What You'll Do
- 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 system
What We're Looking For
- 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.
What's In It For You
- At FactSet, our people are our greatest asset, and our culture is our biggest competitive advantage. Being a FactSetter means:
- The opportunity to join an S&P 500 company with over 45 years of sustainable growth powered by the entrepreneurial spirit of a start-up.
- Support for your total well-being. This includes health, life, and disability insurance, as well as retirement savings plans and a discounted employee stock purchase program, plus paid time off for holidays, family leave, and company-wide wellness days.
- Flexible work accommodations. We value work/life harmony and offer our employees a range of accommodations to help them achieve success both at work and in their personal lives.
- A global community dedicated to volunteerism and sustainability, where collaboration is always encouraged, and individuality drives solutions.
- Career progression planning with dedicated time each month for learning and development.
- Business Resource Groups open to all employees that serve as a catalyst for connection, growth, and belonging.
- Learn more about our benefits here. Salary is just one component of our compensation package and is based on several factors including but not limited to education, work experience, and certifications.
Company Overview:
FactSet (NYSE:FDS| NASDAQ:FDS) helps the financial community to see more, think bigger, and work better. Our digital platform and enterprise solutions deliver financial data, analytics, and open technology to more than 8,200 global clients, including over 200,000 individual users. Clients across the buy-side and sell-side, as well as wealth managers, private equity firms, and corporations, achieve more every day with our comprehensive and connected content, flexible next-generation workflow solutions, and client-centric specialized support. As a member of the S&P 500, we are committed to sustainable growth and have been recognized among the Best Places to Work in 2023 by Glassdoor as a Glassdoor Employees’ Choice Award winner. Learn more at www.factset.com and follow us on X and LinkedIn.
At FactSet, we celebrate difference of thought, experience, and perspective. Qualified applicants will be considered for employment without regard to characteristics protected by law.