Sr Software Engineer – API Platform, Product Engineering (Python/Typescript)

We’re obsessed with making hard work pay off, for our people, our customers, and the world around us. As a Fortune 500 company and a leading AI platform for managing people, money, and agents, we’re shaping the future of work so teams can reach their potential and focus on what matters most. The minute you join, you’ll feel it. Not just in the products we build, but in how we show up for each other. Our culture is rooted in integrity, empathy, and shared enthusiasm. We’re in this together, tackling big challenges with bold ideas and genuine care. We look for curious minds and courageous collaborators who bring sun-drenched optimism and drive. Whether you're building smarter solutions, supporting customers, or creating a space where everyone belongs, you’ll do meaningful work with Workmates who’ve got your back. In return, we’ll give you the trust to take risks, the tools to grow, the skills to develop and the support of a company invested in you for the long haul. So, if you want to inspire a brighter work day for everyone, including yourself, you’ve found a match in Workday, and we hope to be a match for you too.

As a Senior Software Development Engineer in Product Engineering, you'll help design and build the high-throughput, low-latency APIs and backend services that power Workday's next generation of products and agents.

You'll turn product requirements into scalable services, object models, and API endpoints, applying strong object-oriented design principles to build systems that are easy to maintain and extend over time. You'll also help shape how the team approaches API design, improve performance and observability across critical systems, and support the growth of engineers around you.

Key Responsibilities:

• Lead the design and development of APIs, backend services, and platform features used across Product Engineering.
• Turn product requirements into clear service boundaries, domain models, and well-designed API endpoints, using OpenAPI and internal standards.
• Help expose product capabilities through REST, GraphQL, SOAP, and emerging integration patterns that work well for agents, internal teams, and external consumers.
• Improve performance and scalability through latency optimization, capacity planning, caching, and resiliency patterns for mission-critical flows.
• Build observability into product APIs — metrics, tracing, logging, and dashboards — and use that data to guide technical decisions.
• Support design reviews, code reviews, and technical documentation, and mentor junior and mid-level engineers.
• Participate in on-call and incident response, including root cause analysis and long-term fixes for significant issues.

• Minimum of 8 years of experience in software development engineering, architecting, building, and scaling robust and efficient software systems.
• Minimum of 5 years of experience in software engineering, with hands-on experience in object-oriented modeling and software design concepts such as domain modeling, abstraction, encapsulation, extensibility, and maintainable service design.
• of experience designing API endpoints that expose product functionality clearly, consistently, securely, and at scale.
• Bachelor's degree in Computer Science, Engineering, or related discipline, or equivalent practical experience.

• Skilled in algorithmic thinking, including advanced data structures and algorithms such as graphs, concurrent data structures, and caching/eviction strategies, to design and optimize solutions for complex API orchestration, request routing, and high-throughput workloads.
• Solid experience with API development, including REST, SOAP, GraphQL, OpenAPI/Swagger-driven design, and designing and building scalable, secure APIs and API integration patterns.
• Experience creating API endpoints that map clearly to product functionality, domain concepts, and customer-facing workflows.
• Hands-on experience building and operating large-scale systems with complex product domains, high transaction volumes, and enterprise-grade reliability requirements.
• In-depth understanding of code testing methodologies, such as contract testing, performance testing, system testing, and integration testing, and experience with advanced testing tools or frameworks such as JUnit, ScalaTest, Postman, Mockito, Jacoco, or Scoverage.
• In-depth understanding of object-oriented design principles, including SOLID, abstraction, encapsulation, inheritance, composition, and polymorphism.
• Practical experience applying domain-driven design concepts, object-oriented modeling, and common architectural patterns, such as layered architecture and hexagonal architecture, to scalable software systems.
• Solid understanding of software development principles and advanced development methodologies such as continuous delivery, trunk-based development, and test-driven or behavior-driven development.
• Solid experience with source control management tools such as Git and advanced branching and merging strategies across multiple teams or services.
• Demonstrated ability to lead team collaboration within a software development team and mentor junior and mid-level engineers through design reviews, technical guidance, code reviews, and knowledge sharing.
• Skilled technical writer, with experience producing comprehensive technical specifications, design documents, RFCs, API documentation, and integration best-practice guides.
• Experience using AI-assisted code generation and review tools, such as Cursor, Claude Code, or GitHub Copilot, to improve development speed and quality.
• Exposure to MCP or similar agent/tool integration models is a strong plus.

The annualized base salary ranges for the primary location and any additional locations are listed below.  Workday pay ranges vary based on work location. As a part of the total compensation package, this role may be eligible for the Workday Bonus Plan or a role-specific commission/bonus, as well as annual refresh stock grants. Recruiters can share more detail during the hiring process. Each candidate’s compensation offer will be based on multiple factors including, but not limited to, geography, experience, skills, job duties, and business need, among other things. For more information regarding Workday’s comprehensive benefits, please click here.

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