Senior COBOL & Java Modernization Engineer

• More than 5 years of professional experience in Java development.
• Professional English level for documentation and international collaboration.
• Solid experience with:
  • Java
  • Spring Core
  • Spring Boot
  • Spring Data
  • Spring Batch in production environments
• Experience in high-volume batch applications and critical processes.
• Ability to analyze and understand existing COBOL and JCL code.
• Knowledge of:
  • Fixed-length files
  • Embedded SQL
  • Batch processing
  • Error and return code handling
  • Reprocessing and fault recovery
• Experience in advanced testing:
  • Regression testing
  • Golden Master
  • Test case design
  • Mutation Testing
  • Code coverage
• Experience using AI applied to software development:
  • Prompt Engineering
  • Development agents
  • LLM output evaluation
  • Assisted code generation
  • Hallucination and quality control
• Regular use of:
  • Git
  • Bash
  • Python
  • Linux / Terminal environments

Desirable:

• Previous experience in banking and mainframe environments.
• Knowledge of:
  • z/OS
  • DB2
  • CICS
  • IMS
  • Control-M
• Participation in COBOL → Java migration projects.
• Knowledge of corporate batch frameworks in the financial sector.
• Experience building agent pipelines and advanced automations for development.
• Knowledge of methodologies based on executable specifications or Spec-Driven Development.
• Experience analyzing costs, token consumption, and quality metrics in AI-based solutions.

We are currently looking to hire a COBOL & Java Modernization Engineer with proven experience in legacy system modernization environments, capable of analyzing mainframe applications, designing target Java architectures, and leveraging AI tools to accelerate technological transformation processes with guarantees of quality and functional equivalence.

• Analyze COBOL programs and JCL grids to understand functional flows, dependencies, datasets, return codes, and existing business logic.
• Design and implement target solutions using Java, Spring Boot, and Spring Batch.
• Define jobs, steps, readers, writers, chunking processes, restarts, and fault tolerance mechanisms.
• Prepare and maintain functional and technical specifications under Spec-Driven Development approaches.
• Build and optimize agents, prompts, skills, and automations using AI tools for assisted development.
• Validate functional equivalence between legacy applications and new implementations.
• Design testing strategies, golden master, regression testing, and validation automation.
• Analyze quality, productivity, and efficiency metrics of the modernization pipeline.
• Identify continuous improvement opportunities in the processes, tools, and frameworks used.
• Collaborate closely with expert teams in mainframe environments and enterprise architecture.

• We are looking for a person who:

  • Questions and validates code through testing and objective evidence.
  • Has a quality and continuous improvement mindset.
  • Is capable of understanding complex systems and documenting them clearly.
  • Enjoys solving highly complex technical problems.
  • Works collaboratively with multidisciplinary teams.
  • Knows how to listen, ask, and share knowledge with experts from different areas.
  • Maintains a vision oriented toward the sustainability and maintainability of solutions.
  • Is rigorous, analytical, and detail-oriented.