Technical Lead (.NET / Full-Stack) – Tax Calculation

Location: LATAM (Remote)

Job Description

We are seeking a Technical Lead (.NET / Full-Stack) to support an American consulting firm working on applications in the Tax Calculation (TaxCalc) domain. This role focuses on modernizing legacy .NET applications built on SQL Server, with an emphasis on database decoupling and incremental modernization using the Strangler Pattern.

This is a hands-on technical leadership role with strong ownership, architectural responsibility, and collaboration across distributed teams.

Responsibilities

• Lead the technical modernization of legacy .NET and SQL Server applications

• Define and evolve system architecture using incremental modernization approaches

• Drive database decoupling and reduce tight coupling in legacy systems

• Establish and own testing strategies (unit, integration, regression)

• Perform code reviews with a focus on quality, test coverage, and risk reduction

• Provide technical guidance and mentorship to engineers

• Collaborate with product, QA, and business stakeholders

• Ensure system reliability, observability, and maintainability

Requirements

• Strong hands-on experience with .NET (C#) in production environments

• Solid experience with SQL Server

• Proven experience working with and modernizing legacy systems

• Hands-on experience with Strangler Pattern or similar incremental approaches

• Strong background in automated testing (unit and integration)

• Experience with APIs and service-based architectures

• Prior experience acting as a Technical Lead (architecture decisions, code reviews, mentoring)

• Experience in Tax, Finance, Compliance, or regulated domains

• Strong communication skills and ability to work with distributed teams

Nice to Have

• Cloud experience (Azure, AWS, or GCP)

• CI/CD pipelines and quality gates

• Experience with contract or end-to-end testing