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Senior Delphi Software Engineer with 17 years of professional software development experience, including more than 10 years working with Delphi across multiple versions and maintaining complex, business-critical enterprise applications.

I am seeking a remote Senior Delphi Developer, Senior Delphi Engineer, or Technical Lead position where I can contribute to application development, legacy-system modernization, performance improvement, and database-intensive backend solutions.

My experience includes object-oriented development, REST and SOAP integrations, SQL Server, Oracle, MySQL, Firebird, Visual FoxPro, and PowerBuilder. I am comfortable analyzing large existing codebases, troubleshooting production issues, optimizing SQL, implementing new functionality, and collaborating with international Agile teams.

I have a strong record of delivery, supported by recommendation letters from engineering leadership, and I am fluent in English and a native Portuguese speaker. I am available for international remote opportunities on a full-time or contract basis.

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RAFAEL HASSEGAWA

SENIOR DELPHI DEVELOPER / ENGINEER

Belo Horizonte, Brazil | Available for Remote OpportunitiesEmail: [email protected]: https://www.linkedin.com/in/rafael-hassegawa

PROFESSIONAL SUMMARY

Senior Delphi Developer with 17+ years of professional software development experience, including more than 10 years working with multiple versions of Delphi. Extensive experience developing, maintaining, modernizing, and optimizing complex, business-critical enterprise applications.

Strong background in Delphi, object-oriented programming, SQL development, database optimization, REST and SOAP integrations, legacy-system modernization, debugging, and production support. Experienced in banking, tax compliance, financial systems, and other environments where reliability, accuracy, and performance are essential.

Proven record of delivering high volumes of features and fixes, improving development processes, and working effectively with international and distributed Agile teams. Fluent in English and native in Portuguese.

TECHNICAL SKILLS

Delphi:Delphi/Object Pascal, Borland Delphi 3 through modern Embarcadero versions, VCL, object-oriented programming, enterprise desktop applications, legacy-system maintenance, refactoring, debugging, performance optimization, and application modernization.

Databases:SQL Server, Oracle, MySQL, PostgreSQL, Firebird, complex SQL queries, stored procedures, triggers, query optimization, data modeling, and performance tuning.

Backend and Integration:REST APIs, SOAP web services, external-system integration, business-rule implementation, database-intensive backend systems, and integration between legacy applications and modern services.

Additional Technologies:Visual FoxPro, PowerBuilder, Java, Spring Boot, C, Git, Azure DevOps, CI/CD, Jira, and AI-assisted software development.

Engineering Practices:Clean Code, SOLID principles, code review, Agile/Scrum, technical documentation, root-cause analysis, production support, and collaborative problem-solving.

PROFESSIONAL EXPERIENCE

SOVOS TAX COMPLIANCE – Argentina/USASenior Delphi/C Developer | June 2025 – April 2026

• Developed and maintained complex tax-compliance modules supporting United States, Canadian, and Latin American jurisdictions within a large-scale enterprise platform.• Refactored and optimized legacy code, improving the maintainability and performance of critical compliance functionality.• Delivered a consistently high volume of features, fixes, and technical improvements in an international Agile team.• Contributed to the performance and reliability of business-critical platforms responsible for a substantial part of the company’s revenue.• Used AI-assisted development tools such as Cursor to accelerate code analysis, refactoring, debugging, and documentation while independently testing and validating all changes.• Ranked as the team’s top Jira contributor during multiple monthly delivery cycles.

INTER – BrazilSenior Backend Engineer | August 2024 – March 2025

• Developed and maintained core banking applications in a high-volume fintech environment.• Helped integrate legacy systems with modern backend services and responsive applications.• Implemented and consumed REST and SOAP APIs for communication among internal systems and external services.• Optimized SQL Server stored procedures, triggers, and queries used in high-volume financial operations.• Delivered critical production updates under demanding deadlines while protecting data integrity and system reliability.

HASSEGAWA MKT – BrazilOwner / Senior Delphi Developer | January 2023 – July 2024

• Founded and managed a digital-marketing and software-development consultancy.• Delivered software and web solutions for local clients.• Worked concurrently as a part-time Senior Delphi Developer for Starling Software.

INFOSISTEMAS LTDA – BrazilSenior Delphi Developer | May 2022 – January 2023

• Developed and maintained Delphi applications supporting business-critical operations.• Standardized development and deployment workflows, reducing operational costs by approximately 20%.• Introduced structured debugging and issue-tracking practices that accelerated root-cause analysis.• Improved maintainability through stronger documentation and software-engineering practices.

MICROUNIVERSO LTDA – BrazilSoftware Developer / QA Analyst | November 2020 – May 2022

• Developed, maintained, and tested enterprise software applications.• Reduced testing costs by approximately 60% through process improvements and more efficient validation strategies.• Improved application reliability by implementing structured testing and defect-analysis practices.

LBC SISTEMAS LTDA – BrazilSenior Delphi Developer | July 2019 – November 2020

• Developed and optimized high-performance Delphi applications supporting business-critical operations.• Improved the stability and performance of applications containing complex business rules and large data-processing workloads.• Collaborated with cross-functional teams to enhance development processes and streamline delivery.• Provided technical assistance to clients, supporting the successful adoption and operation of delivered solutions.

STARLING SOFTWARE – BrazilSenior Delphi Developer / Technical Lead | October 2014 – July 2019

• Led the development and maintenance of enterprise Delphi applications supporting business-critical operations.• Promoted Clean Code, SOLID principles, coding standards, and maintainable application architecture.• Delivered approximately 15–20 features and fixes per month.• Established development standards that improved code maintainability and accelerated the onboarding of new developers.• Provided technical leadership, code reviews, and guidance to other developers.• Later returned to Starling as a part-time Senior Delphi Developer while operating Hassegawa MKT.

EARLIER SOFTWARE DEVELOPMENT EXPERIENCE2008 – 2014

• Developed and maintained commercial and enterprise systems using Delphi, Visual FoxPro, PowerBuilder, and relational databases.• Built extensive experience with business rules, SQL development, legacy applications, troubleshooting, and customer-facing production systems.

EDUCATION

Bachelor of Computer ScienceFUMEC University – Belo Horizonte, Brazil

English for Academic PurposesBrowns English Language School – Brisbane, Australia

Certificate IV in Digital Media Technologies – Scholarship RecipientAustralian College of Information Technology – Brisbane, Australia

LANGUAGES

Portuguese: NativeEnglish: FluentSpanish: Currently studying

ADDITIONAL INFORMATION

• Available for international remote employment and contract opportunities.• Experienced in collaborating with distributed and multicultural engineering teams.• Professional recommendation letters from engineering leadership are available upon request.

Profile: https://www.linkedin.com/in/rafael-hassegawa/