Temporary Senior Backend Lead Developer – Capital Markets Technology Transformation

About this role

We are the leading provider of professional services to the middle market globally, our purpose is to instill confidence in a world of change, empowering our clients and people to realize their full potential. Our exceptional people are the key to our unrivaled, culture and talent experience and our ability to be compelling to our clients. You’ll find an environment that inspires and empowers you to thrive both personally and professionally. There’s no one like you and that’s why there’s nowhere like RSM.

Temporary Senior Backend Lead Developer – Capital Markets Technology Transformation

About the Role
We are seeking an experienced Senior Backend Lead Developer for a temporary opportunity supporting a large-scale technology transformation for a leading Capital Markets client. In this role, you will provide hands-on technical leadership, shape modern backend architectures, and guide engineering teams delivering high-performance, scalable, API-driven platforms in a complex enterprise environment.

This position is ideal for a senior backend engineer who enjoys combining architecture, hands-on development, and team leadership within fast-paced, regulated programs.

What You’ll Do

• Lead backend engineering efforts across multiple Agile teams within a major transformation initiative. Define and implement secure, scalable, and resilient backend and API architectures.
• Translate business and functional requirements into technical designs, integration patterns, and reusable frameworks.
• Design and build API-driven services using RESTful and microservices patterns, contract-first development, and Swagger/OpenAPI documentation. Support modernization and legacy platform rewrite initiatives, including migration from older technologies and architectural patterns.
• Write high-quality, secure, and performant backend code using .NET, C#, and SQL Server.
• Build scalable data access components using Dapper ORM. Implement distributed caching solut...