Available to hire
I’m Sergio de Sousa, a Senior Software Engineer with 15+ years of delivering robust, scalable, and high-performance systems. I specialize in Perl and Unix/Linux, with a strong focus on clean, maintainable code and CI/CD-driven development.
I have a solid telecom track record crafting mission-critical billing, CRM, and web platforms for major telecoms and services. I excel at modernizing legacy systems, leading cross-functional teams, and solving production challenges in fast-paced environments.
Language
English
Fluent
Portuguese
Fluent
French
Advanced
Spanish; Castilian
Advanced
Work Experience
Perl Software Specialist at Scotiabank
May 1, 2024 - October 21, 2025Reverse-engineered and modernized high-stakes Perl systems handling risk analysis for mortgage commitments and hedging. Delivered exhaustive documentation and modernization strategy for RiskWatch-based risk reporting systems. Developed and maintained production-grade Perl code with Bash and Python for core daily financial operations.
Software Engineer (Perl) at Charles Jones / Signature Information
June 1, 2023 - October 21, 2025Maintained complex CI/CD pipelines via GitLab for Perl-based applications in production. Migrated and modernized frontends and backends using Perl CGI, Bootstrap, and jQuery. Developed secure API endpoints and automated deployments via Docker and Ansible. Used Bash for log monitoring and automated systems maintenance.
Perl Software Developer at Walmart Canada
June 1, 2022 - October 21, 2025Supported and enhanced logistics-focused Perl applications integrated with WMS. Rewrote legacy codebases using Perl and integrated React and Node.js for UI. Maintained SQL Server and MySQL databases; managed ETL with SSIS. Daily Bash scripting for automation and system integrity checks.
Perl Programmer at Walmart Canada
July 1, 2019 - October 21, 2025Led migration of legacy warehouse tools to object-oriented Perl. Developed full-stack logistics systems with Android and web interfaces. Used Bash extensively for cron jobs, CI runners, and deployment scripts.
Team Leader – Perl Development at Greenwich Associates
May 1, 2015 - October 21, 2025Created new Perl modules for enterprise metrics tools. Led full-stack system development for client satisfaction tracking. Coached teams on Perl development standards and practices. Developed Bash tools to monitor system health and support development.
Technical Architect / Project Coordinator at Portugal Telecom (SAPO.pt)
April 1, 2006 - October 21, 2025Architected and deployed one of Europe’s largest blogging platforms (Blogs SAPO) using Perl Catalyst and mod_perl. Developed a scalable comment management subsystem based on open source LiveJournal platform.
Technical Lead – Clix Portal at Sonaecom
June 1, 2009 - October 21, 2025Led development of a major Portuguese ISP portal; strong use of Perl Catalyst, mod_perl, and Linux systems. Managed full stack delivery, mentoring developers and integrating Bash scripting for operations.
Sr. Application Solution Developer at Amdocs (formerly Solect Technologies)
December 1, 2000 - October 21, 2025Designed and deployed telecom billing (CCB) and CRM solutions for AT&T, Ameritech, and USXchange. Led migrations and trained teams on Perl, SQL, and Java.
Technical Analyst – Internet Services at Sprint Canada
November 1, 1998 - October 21, 2025Designed infrastructure for Sprint's nationwide ISP. Solved major authentication bottlenecks, significantly boosting login performance. Extensive Bash scripting for systems automation and log processing.
ISP Network and Systems Developer at SerSo Business Systems Inc.
February 1, 1997 - October 21, 2025Founded and operated SerSo.com, an early ISP in Toronto using Linux. Engineered all backend systems using PERL, C, PostgreSQL, and Visual Basic. Created automated billing, help desk, and account setup tools.
Education
Bachelor of Commerce at Universidade Internacional
October 3, 1987 - June 21, 1991Business Administration and Management
Qualifications
Industry Experience
Telecommunications, Financial Services, Transportation & Logistics, Retail, Software & Internet, Education, Professional Services, Media & Entertainment
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