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 also use AI-assisted engineering workflows as a practical productivity layer for research, documentation, task decomposition, test-case thinking, refactoring exploration, and repetitive technical work, while keeping review, testing, maintainability, and production accountability with the engineer.

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

Responsible AI-assisted engineering

I use AI tools as practical engineering assistants, not as substitutes for design judgment, testing, or accountability. In backend and systems work, AI can be useful for research acceleration, documentation, implementation planning, test-case ideation, and reducing friction in repetitive workflows.

I wrote a short article explaining how I approach AI-assisted work in a reliability-first engineering context: Responsible AI-Assisted Engineering for Backend and Systems Work.

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
  • Practical AI-assisted engineering workflows with human review and validation

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
  • AI-assisted research, documentation, test planning, and workflow mechanization
Details and examples available on request.

Open-source 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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