Temporary Senior Backend Developer Jobs (NOW HIRING)

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 solutions such as Apache Ignite or MemSQL to support high-throughput processing.
• Integrate messaging and real-time platforms such as Solace or SignalR for event-driven architectures.
• Implement logging, monitoring, and observability using enterprise frameworks such as Serilog, ELK, or Splunk-based solutions.
• Drive engineering best practices including code quality, security, exception handling, and layered architecture.
• Lead code reviews, technical mentoring, and pairing sessions. Promote test-driven development and automated unit testing using xUnit or NUnit with strong coverage expectations.
• Establish reusable backend components and shared frameworks to accelerate delivery.
• Define and support SDLC and CI/CD practices, including Git-based branching strategies such as GitFlow or trunk-based development.
• Partner with DevOps and SRE teams to support CI/CD pipelines using Jenkins, Helios, and automated quality gates.
• Contribute to continuous improvement of development standards, workflows, and documentation.
• Collaborate closely with architects, product owners, business analysts, QA, and platform teams. Participate in Agile ceremonies and use tools such as Jira, Confluence, and architecture diagramming tools.
• Provide hands-on troubleshooting and technical guidance through development and production support phases.

What You Bring

• 10+ years of backend engineering experience using .NET and C# in enterprise environments.
• Strong experience building scalable RESTful APIs, microservices, and API documentation using Swagger/OpenAPI.
• Deep experience with SQL Server, Dapper ORM, JSON/XML, and performance tuning.
• Experience with distributed caching platforms such as Apache Ignite or MemSQL.
• Hands-on experience with messaging and event-driven architectures using Solace, SignalR, or similar technologies.
• Strong background in unit testing, TDD, and automated test pipelines using xUnit or NUnit.
• Practical experience with CI/CD pipelines, Jenkins, Helios, and Git-based workflows.
• Proven ability to lead development teams and communicate effectively with technical and non-technical stakeholders.

Nice to Have

• Experience in financial services or capital markets, including trading, risk, clearing, or settlement platforms.
• Exposure to front-end frameworks such as React or Angular to support collaboration with full-stack teams.

Education

• Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience.

At RSM, we offer a competitive benefits and compensation package for all our people.We offer flexibility in your schedule, empowering you to balance life's demands, while also maintaining your ability to serve clients.Learn more about our total rewards at https://rsmus.com/careers/working-at-rsm/benefits.

All applicants will receive consideration for employment as RSM does not tolerate discrimination and/or harassment based on race; color; creed; sincerely held religious beliefs, practices or observances; sex (including pregnancy or disabilities related to nursing); gender; sexual orientation; HIV Status; national origin; ancestry; familial or marital status; age; physical or mental disability; citizenship; political affiliation; medical condition (including family and medical leave); domestic violence victim status; past, current or prospective service in the US uniformed service; US Military/Veteran status; pre-disposing genetic characteristics or any other characteristic protected under applicable federal, state or local law.

Accommodation for applicants with disabilities is available upon request in connection with the recruitment process and/or employment/partnership.RSM is committed to providing equal opportunity and reasonable accommodation for people with disabilities. If you require a reasonable accommodation to complete an application, interview, or otherwise participate in the recruiting process, please call us at 800-274-3978 or send us an email at careers@rsmus.com.

RSM does not intend to hire entry level candidates who will require sponsorship now OR in the future (i.e. F-1 visa holders). If you are a recent U.S. college / university graduate possessing 1-2 years of progressive and relevant work experience in a same or similar role to the one for which you are applying, excluding internships, you may be eligible for hire as an experienced associate.

RSM will consider for employment qualified applicants with arrest or conviction records. For those living in California or applying to a position in California, please click here for additional information.

At RSM, an employee's pay at any point in their career is intended to reflect their experiences, performance, and skills for their current role. The salary range (or starting rate for interns and associates) for this role represents numerous factors considered in the hiring decisions including, but not limited to, education, skills, work experience, certifications, location, etc. As such, pay for the successful candidate(s) could fall anywhere within the stated range.