Software Engineer III - Buyside Services Engineering

Your Team's Impact 

We are looking for a talented and experienced Software Engineer III to join our Buyside Services Engineering team. In this role, you will serve as an individual contributor responsible for designing, building, enhancing, and maintaining a suite of industry-leading products that power FactSet's Portfolio Services and Managed Services business.

You will work closely with cross-functional teams including Product Development, Analytics Engineers, and Team Leads to deliver high-quality, performant, and scalable software solutions that drive transparency, data integrity, and operational efficiency for our clients. You will take ownership of complex technical initiatives, contribute to solution design, and help improve the scalability, reliability, and maintainability of our applications.

The Buyside Services Engineering team drives the evolution of workflow and process monitoring tools that are critical to FactSet's managed and co-sourced operating model offerings.

Our products provide:

• End-to-end transparency from client data integration to processed data consumption
• Data validation and accuracy assurance at every stage of transformation and enrichment
• Presentation-ready outputs for performance, risk, and reporting operations
• Managed Services capabilities that shift the burden of data and process management from clients to FactSet's domain experts

Through continuous innovation and dedicated expertise, we empower clients to focus on their core competencies while we ensure the integrity, timeliness, and quality of their analytical operations.

What You'll Do 

• Design and develop complex features, enhancements, and technical solutions across our applications
• Own development activities from technical design through implementation, testing, deployment, and production support
• Collaborate with Product Development to understand business requirements and translate them into scalable and maintainable technical solutions
• Contribute actively to technical design discussions and evaluate solutions for performance, scalability, reliability, and maintainability
• Identify opportunities to improve application performance, stability, scalability, and technical health
• Diagnose and resolve complex production issues, identifying patterns and opportunities for preventative improvements
• Break down larger technical requirements into well-defined development tasks and deliverables
• Work with the Product Development team to prioritize and resolve production and development issues
• Champion engineering best practices through code reviews, automated testing, documentation, and thoughtful technical design
• Share technical knowledge and provide guidance to less-experienced engineers through code reviews, troubleshooting, and day-to-day collaboration

What We're Looking For 

• 3–5 years of hands-on software engineering industry experience
• Strong Python proficiency with a demonstrated track record of building production-grade, client-facing systems
• Strong understanding of Object-Oriented Programming (OOP) principles, software design patterns, and maintainable application architecture
• Proven experience designing and building RESTful APIs and backend services
• Strong JavaScript/TypeScript experience with the ability to build and maintain modern web applications
• Experience with JavaScript-based frontend frameworks such as Vue.js, Angular, or React
• Hands-on experience with frontend and backend testing frameworks such as Jasmine, Karma, Puppeteer, pytest, and unittest
• Strong database design skills with hands-on PostgreSQL experience, including schema design, query optimization, indexing strategies, and relational data models at scale
• Experience working with large datasets using Polars or equivalent dataframe libraries
• Experience implementing caching strategies for query results and metadata
• Experience with service-oriented architectures and developing applications composed of multiple interconnected services
• Ability to troubleshoot complex application and production issues across multiple components
• Experience independently delivering complex technical work while collaborating effectively with Product and Engineering partners
• B.Tech / M.Tech in Computer Science or equivalent educational background

Good to have

• Practical experience with AWS services including SQS, Lambda, and ECS
• Experience with microservices architecture and distributed systems
• Understanding of failure handling and resiliency across service boundaries
• Experience designing parallel or asynchronous workflows to improve throughput and resource utilization
• Experience working with large-scale data systems and balancing latency, throughput, and cost
• Understanding of multi-tier architectures and orchestration across multiple backend systems
• Experience with rate limiting, throttling, and client quota management
• Experience with D3.js and interactive data visualization
• Experience with graph databases such as Neo4j and graph-based data modelling.

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.