Senior Software Engineer · Payments Modernization · Platform Engineering

Building reliable software systems for complex business-critical workflows.

I’m Santhosh Sathiyaraj, a full-stack engineer focused on payment platforms, modernization of legacy systems, scalable Java/Spring Boot services, Angular applications, PostgreSQL-backed systems, and practical AI-assisted engineering.

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18+ years engineering experience Payments modernization Full-stack architecture

Selected Work

Engineering work with measurable business value.

Payment Platform Modernization

Led engineering work on modernizing legacy payment workflows into a more maintainable platform using Angular, Java microservices, and PostgreSQL.

  • Reduced reliance on fragile legacy systems
  • Improved operational maintainability
  • Supported migration of critical payment flows

Payroll Migration

Contributed to a multi-year migration program moving client payment workflows from older processes to a modernized system.

  • Large-scale client migration effort
  • Business-critical payment processing
  • Focus on reliability and operational accuracy

Engineering Automation

Exploring AI-assisted engineering workflows that help teams understand systems, reduce repetitive work, and improve release confidence.

  • Developer productivity
  • Release process improvement
  • System knowledge capture

Impact

A portfolio built around evidence, not just responsibilities.

These numbers should be replaced with final verified evidence before public launch. The layout is designed to make future proof easy to add.

125+clients migrated or in migration pipeline
$50M+payment volume influenced through modernization work
65%migration progress toward current client base
3 yrsmulti-year platform modernization effort

Evidence-first portfolio principle

For immigration, promotion, and external credibility, each claim should eventually connect to artifacts: internal metrics, architecture documents, release records, stakeholder notes, screenshots, public writing, open-source activity, or conference materials.

Technical Writing

Practical essays on payments, modernization, and engineering systems.

Speaking & Recognition

Ready for future talks, panels, and external visibility.

This section gives you a clean place to add meetups, podcasts, webinars, peer review activity, judging invitations, awards, or media mentions over time.

Planned

Internal engineering talk

Payment modernization lessons, migration risks, and release confidence.

Planned

Public technical article series

Payments, platform migration, AI engineering, and developer productivity.

About

Engineer, builder, and technical problem solver.

I specialize in building and modernizing full-stack systems that support important business operations. My recent work focuses on payment platforms, legacy modernization, engineering process improvement, and reliable software delivery.

I write about the practical side of software engineering: how to migrate systems safely, design maintainable services, improve release workflows, and apply AI tools without replacing engineering fundamentals.

Contact

Let’s connect.

For engineering conversations, writing, speaking, or collaboration, reach out here.

santhosh@santhoshsathiyaraj.com LinkedIn GitHub