Sergio de Sousa

Professional summary

I am a senior backend and systems engineer with over 20 years of experience designing, modernizing, and stabilizing enterprise systems across banking, telecommunications, and large-scale retail environments.

My work focuses on backend platforms, data-intensive systems, and long-lived infrastructure, particularly in contexts where correctness, clarity, and operational reliability are critical. I am most effective in complex environments that require careful evolution rather than constant reinvention.

I am currently available for contract, fixed-scope project, or full-time engagements (on-site, hybrid, or remote).

Core strengths

  • Backend and systems engineering in Unix/Linux environments
  • Legacy modernization and incremental platform evolution
  • Data processing, migration, and integration workflows
  • Database-driven applications and data integrity concerns
  • Production support, stabilization, and risk-aware engineering
  • Clear documentation and maintainable, predictable systems

Technical background

  • Primary languages: Perl, Python, Java
  • SQL, relational databases, schema evolution
  • Batch processing, ETL-style workflows, system integration
  • Long history in regulated or high-reliability environments
Details and examples available on request.

Open-source and professional contributions

I am an open-source contributor and CPAN author, maintaining production-grade Perl modules with tests, CI, and documentation. This reflects a long-term focus on correctness, maintainability, and disciplined engineering practices.

Engagement profile

I am well suited for:

This page represents my personal professional availability. Managed services and corporate service offerings are handled separately.

Professional context

I am the principal of Serso Engineering, an independent engineering business focused on backend systems and platform modernization. Serso Engineering operates as a separate corporate entity.

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