Senior Legacy Systems Modernization Specialist

4 days ago

Singapore TRANSFINGO INFOTECH SERVICES PTE. LTD. Full time
Roles & Responsibilities

Job Summary:

We are seeking a seasoned PowerBuilder Developer with deep expertise in enterprise-scale legacy application development, modernization, and systems integration. The ideal candidate must have progressive experience in PowerBuilder (across versions 6.5 through 2019 R3), strong database programming proficiency (PL/SQL, T-SQL), and a proven track record in modernizing legacy ecosystems into scalable, modular, and cloud-ready architectures.

Responsibilities:

  • Architect, enhance, and maintain large-scale legacy systems developed in PowerBuilder (v6.5, 8.0, 12.5, and 2017/2019 R3), ensuring backward compatibility and future scalability.
  • Re-engineer and refactor monolithic legacy codebases into modular, maintainable components aligning with clean code and SOLID principles.
  • Translate business workflows into technical design specifications (FRD, TSD, SSD) and oversee their implementation.
  • Perform comprehensive version upgrades, migrating legacy PowerBuilder apps and SQL Server compatibility levels (65 → 80/100), ensuring minimal technical debt and performance degradation.
  • Optimize SQL queries, stored procedures, triggers, and packages in Oracle, SQL Server and Sybase databases for data-intensive applications.
  • Integrate PowerBuilder applications with modern services and third-party APIs using COM/DCOM, OLE Automation, REST/SOAP interfaces.
  • Design and implement caching strategies, memory management routines, and GDI+ optimizations for high-performance UIs.
  • Ensure end-to-end CI/CD enablement and version control integration (Git, TFS, Bitbucket) PowerBuilder source code and PL/SQL assets.
  • Create robust testing strategies (unit, regression, performance) and collaborate closely with QA engineers for quality assurance across release cycles.
  • Lead root cause analysis and resolution of critical incidents, performance bottlenecks and production anomalies.
  • Facilitate DevOps handshakes for UAT, staging, and production deployments by coordinating with Infra, DBA, and Release teams.
  • Document legacy code behavior, integration points, and upgrade path strategies for client-facing and internal use.

Requirements:

  • Min 8+ years of experience in PowerBuilder development and legacy modernization.
  • Extensive experience across PowerBuilder versions: 6.5, 8.0, 12.5, 2017 R3, 2019.
  • Advanced knowledge in database development: PL/SQL, T-SQL, Stored Procedures, Packages, Triggers.
  • Strong experience with Oracle (11g/12c/19c), SQL Server (2000 – 2019) and performance tuning tools.
  • Familiarity with PowerBuilder Foundation Class (PFC) and custom frameworks.
  • Experience integrating PowerBuilder with reporting tools like Crystal Reports, SSRS.
  • Demonstrated ability in migrating PowerBuilder applications to .NET platforms or REST-enabled architectures (desirable).
  • Strong command of source control systems (Git, Bitbucket, SVN, TFS) and continuous integration pipelines.
  • Familiar with Agile/Scrum methodology and tools such as JIRA, Confluence, and ServiceNow.
  • Exposure to containerization technologies (Docker, Kubernetes) and cloud-native transitions (AWS, Azure) is a strong plus.
  • Ability to reverse engineer undocumented applications, infer business logic, and design extensible solutions.
Tell employers what skills you have

Version Control
PowerBuilder
Confluence
.NET
Oracle SQL
T-SQL
Systems Integration
Staging
SQL Server
Containerization
Crystal Reports
Performance Tuning
ServiceNow
TFS
TSQL Stored Procedures
SSRS

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