Senior Full-Stack Engineer C#

Coderio designs and delivers scalable digital solutions for global companies. We combine strong technical expertise with a product mindset to lead complex software initiatives end-to-end. We work with international clients, value autonomy and clear communication, and build long-term partnerships through technical excellence. 

We are looking for a Senior Full-Stack Engineer to join a three-person team at a leading financial institution. The project replaces a legacy system of 16 workflows: a web portal where branch users submit requests, and a backend that sends them to other systems, receives responses, updates statuses and manages approvals. Delivery dates are aggressive, so we need someone who can contribute quickly after onboarding.

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

• 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 [confirm with the client].

• 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 for tackling a challenging, high-volume project.