Senior Full-Stack Engineer, C#

Coderio

. Design and build backend services in C# / .NET, applying clean architecture and engineering best practices .

Posted 10/27/2026full-timeMiami • Florida • United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and building backend services using C# / .NET, applying clean architecture principles, and delivering end-to-end features in an Agile environment. Proficient in writing unit and regression tests while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

C# / .NET DevelopmentClean ArchitectureAgile / Scrum ExperienceUnit and Regression TestingReact and CSS Knowledge

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Applicant Tracking System Keywords

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Hard Skills

C#.NETClean ArchitectureSOLID PrinciplesDomain-Driven DesignUnit TestingRegression TestingAPI DevelopmentSystem IntegrationApproval-Workflow Logic

Soft Skills

Strong CommunicationTeamworkAdaptability

Tools & Technologies

ReactCSS

Industry Keywords

Financial InstitutionAgile TeamHybrid Work Model

Tech Stack

Tools & technologies

React.NET

About the role

Key responsibilities & impact

Design and build backend services in C# / .NET, applying clean architecture and engineering best practices
Deliver features end to end, including APIs, system integrations, approval-workflow logic and the React web portal
Work in an Agile team with two-week sprints and standard 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 owning other systems
Replace a legacy system of 16 workflows for a leading financial institution

Requirements

What you’ll need

5+ years of hands-on software development experience in C# / .NET (7+ preferred), building applications rather than only maintaining them
Applied knowledge of clean architecture: SOLID principles, separation of concerns (SRP), DRY and domain-driven design
Proven experience building an application from scratch
Working knowledge of React and CSS (no UI design specialization required)
Experience writing unit and regression tests
Experience working in Agile / Scrum teams
Strong in-person communication, teamwork and the ability to adapt to a corporate environment
Ability to work in a hybrid model from the Miami Lakes, FL office
Professional level of English

Benefits

Comp & perks

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 and 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 real growth opportunities