Sr. Software Developer – Application Migration & Modernization

Accountabilities:

• • Assess existing .NET Framework applications, identifying dependencies, integrations, data access patterns, technical risks, and modernization priorities.
  • Develop realistic modernization and migration plans, including sequencing, dependencies, risks, and mitigation strategies.
  • Modify application code to support PostgreSQL as the target backend, ensuring the migration goes beyond simply moving the underlying data.
  • Modernize and migrate legacy data access layers, including ADO.NET and older Entity Framework implementations, toward current and maintainable patterns.
  • Migrate Oracle workloads to PostgreSQL, including schema conversion, PL/SQL-to-PL/pgSQL translation, data type and collation changes, query rewrites, and performance validation.
  • Analyze and preserve business logic embedded in legacy database objects such as packages, procedures, triggers, and sequences.
  • Develop characterization, integration, and automated comparison tests to validate application behavior and make migrations reliable and defensible.
  • Contribute to CI/CD pipelines, deployment automation, monitoring, and observability for modernized applications.
  • Collaborate directly with architects, DBAs, product owners, and other stakeholders, translating technical trade-offs into clear business language.
  • Document architectural and technical decisions to ensure solutions remain understandable and maintainable.
  • Mentor mid-level developers and conduct code reviews with a strong focus on maintainability, quality, and long-term sustainability.

  Requirements:

  • 10+ years of professional software development experience, with substantial hands-on expertise in C# and .NET.
  • Strong current knowledge of .NET Framework 4.8 and legacy technologies including ASP.NET MVC/Web API, Web Forms, WCF, IIS, and Windows Services.
  • Proven experience modernizing or migrating existing applications, rather than focusing exclusively on greenfield development.
  • Strong relational database expertise, including SQL development and tuning, execution-plan analysis, transactions, and isolation behavior.
  • Hands-on experience with Oracle and PL/SQL, including packages, procedures, triggers, and sequences, with the ability to understand business logic embedded in database code.
  • Practical experience migrating or adapting applications and databases to PostgreSQL, including data types, queries, schema structures, and performance considerations.
  • Experience with source control, branching strategies, and CI/CD tools such as Git, Azure DevOps, GitHub Actions, or comparable platforms.
  • Strong analytical and problem-solving abilities, particularly when working with undocumented systems or incomplete requirements.
  • Clear communication skills and the ability to explain technical decisions and trade-offs to non-technical stakeholders.
  • Collaborative mindset, ownership, and the ability to work effectively in distributed teams.
  • Experience mentoring developers and reviewing code with an emphasis on maintainability and engineering quality.

  Benefits:

  • 100% remote working arrangement.
  • Full-time, hourly engagement.
  • Initial 2-month contract with the possibility of extension.
  • Open to candidates based in Brazil and across Latin America.
  • Opportunity to work on complex, production-critical application modernization and cloud migration projects.
  • Hands-on exposure to .NET modernization, Oracle-to-PostgreSQL migration, AWS infrastructure, automation, testing, and CI/CD.
  • Collaborative environment involving architects, DBAs, product owners, and experienced engineering teams.