Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I am a Senior Software Engineer with 22+ years of experience building and scaling production-grade systems across embedded platforms, distributed backend services, modern web applications, and cloud infrastructure.\n\nI focus on reliability, performance, and security in high-availability environments. I combine hands-on technical depth with clear documentation and collaboration, and I actively use AI tools like Claude, Goose, and ChatGPT to speed problem solving and improve delivery outcomes.…I am a Senior Software Engineer with 22+ years of experience building and scaling production-grade systems across embedded platforms, distributed backend services, modern web applications, and cloud infrastructure.\n\nI focus on reliability, performance, and security in high-availability environments. I combine hands-on technical depth with clear documentation and collaboration, and I actively use AI tools like Claude, Goose, and ChatGPT to speed problem solving and improve delivery outcomes.

KATRINA CATE CALARA

Full Stack Developer, Back-End Developer, Web Developer, +2





I am a Senior Software Engineer with 22+ years of experience building and scaling production-grade systems across embedded platforms, distributed backend services, modern web applications, and cloud infrastructure.\n\nI focus on reliability, performance, and security in high-availability environments. I combine hands-on technical depth with clear documentation and collaboration, and I actively use AI tools like Claude, Goose, and ChatGPT to speed problem solving and improve delivery outcomes.…I am a Senior Software Engineer with 22+ years of experience building and scaling production-grade systems across embedded platforms, distributed backend services, modern web applications, and cloud infrastructure.\n\nI focus on reliability, performance, and security in high-availability environments. I combine hands-on technical depth with clear documentation and collaboration, and I actively use AI tools like Claude, Goose, and ChatGPT to speed problem solving and improve delivery outcomes.

Available to hire

I am a Senior Software Engineer with 22+ years of experience building and scaling production-grade systems across embedded platforms, distributed backend services, modern web applications, and cloud infrastructure.\n\nI focus on reliability, performance, and security in high-availability environments. I combine hands-on technical depth with clear documentation and collaboration, and I actively use AI tools like Claude, Goose, and ChatGPT to speed problem solving and improve delivery outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Software Engineer II at Afterpay Corporate Services Pty Ltd

October 1, 2019 - May 1, 2026

Architected and developed embedded terminal applications for health systems using C/C++ on Ingenico devices; designed a GPS abstraction layer with multi-tier fallback logic and non-blocking integration to improve transaction reliability; implemented a multi-certificate TLS/GPRS rotation system to improve connection redundancy; enhanced terminal stability via DNS configuration and Ethernet → GPRS fallback mechanisms. Built Java/Kotlin microservices (Dropwizard) powering health claim workflows with secure JWT-based communication; improved backend persistence, logging, and digital authorization (SMS) flows; contributed to Android health claims app development including device activation, token lifecycle management, and end-to-end claims submission flows; contributed to Java 17 upgrade and backend modernization; improved AWS-based infrastructure reliability (Lambda workflows, Parameter Store configuration, SFTP operations, certificate lifecycle management); designed automation frameworks

Principal Software Engineer at Fisher - Rosemount Systems, Inc.

February 1, 2008 - May 1, 2019

Led cross-functional teams delivering enterprise industrial automation systems across DeltaV releases; owned architectural design decisions, conducted technical design reviews, and enforced code quality standards to ensure scalable and maintainable systems; collaborated with Product Owners during PI Planning and sprint cycles to refine user stories, define acceptance criteria, and align engineering execution with product objectives; managed project planning, task prioritisation, estimation, and risk mitigation to ensure consistent high-quality delivery; led research, design, and prototyping initiatives to deliver complex system enhancements including IIS hardening, OS migration, localization, and installer frameworks; mentored senior engineers and promoted best practices in unit testing, automated testing, and maintainable system design; coordinated with global (US-based) teams and QA to support major releases and resolve complex production issues.

System Engineer at Soft Service Ltd.

April 1, 2007 - November 1, 2007

Designed and developed optimization systems for chip mounting machines using C++ in Windows environments; contributed to system architecture, code reviews, and production issue resolution.

Software Development Engineer at Fujitsu Ten Solution Philippines, Inc

October 1, 2004 - April 1, 2007

Designed and developed embedded automotive audio software systems in C for NEC V850 platforms; contributed to system design, implementation, and code quality improvements across multiple product releases.