Senior Full-Stack Engineer C#

Coderio • Miami, FL

13d • Hybrid

About The Position

Coderio is seeking a Senior Full-Stack Engineer to join a three-person team working with a leading financial institution. The project replaces a legacy system of 16 workflows, including a web portal through which branch users submit requests and a backend that routes requests to other systems, receives responses, updates statuses, and manages approvals. The role requires contributing quickly after onboarding to meet aggressive delivery dates.

The engineer will design and build backend services in C#/.NET and deliver features end to end, including APIs, integrations, approval-workflow logic, and the React web portal. The team follows Agile practices with two-week sprints. The role also involves technical collaboration, code reviews, testing, documentation, and coordination with business stakeholders and teams responsible for other systems. The position uses a hybrid model based at the Miami Lakes, Florida office and is described as a long-term contract engagement.

Requirements

• At least 5 years of hands-on software development experience in C#/.NET; 7 or more years is preferred.
• Experience building applications, rather than only maintaining them.
• Applied knowledge of clean architecture, including SOLID principles, separation of concerns (SRP), DRY, and domain-driven design.
• Proven experience building an application from scratch.
• Working knowledge of React and CSS; UI design specialization is not required.
• Experience writing unit and regression tests.
• Experience working in Agile/Scrum teams.
• Strong in-person communication and teamwork skills, and the ability to adapt to a corporate environment.
• Ability to work in a hybrid model from the Miami Lakes, Florida office.
• Professional-level English; the posting notes this should be confirmed with the client.

Nice To Haves

• Experience in banking or financial services.
• Experience integrating systems through REST APIs and messaging.
• Experience with workflow and approval processes.
• Familiarity with UI templates such as Mantis.
• A genuine passion for programming and tackling a challenging, high-volume project.

Responsibilities

• Design and build backend services in C#/.NET using clean architecture and engineering best practices.
• Deliver features end to end, including APIs, integrations with other systems, approval-workflow logic, and the React web portal.
• Work in an Agile team with two-week sprints and regular ceremonies.
• Answer teammates’ technical questions and participate in code reviews.
• Write and maintain unit and regression tests.
• Document technical decisions and collaborate with business stakeholders and teams that own other systems.

Benefits

• Hybrid collaboration in a dynamic and fast-paced environment in the Miami/Fort Lauderdale area.
• Long-term contract engagement with high impact and autonomy.
• Strategic, high-visibility role within a modern engineering culture.
• Opportunity to influence technical strategy, especially regarding modern event-driven architectures and AI integrations.
• Collaborative international team with strong technical leadership.
• Inclusive and challenging environment with growth opportunities.

What This Job Offers

• Career Level: Senior
• Education Level: No Education Listed