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Frontend engineer with 18 years of experience building and modernising high-stakes, regulated systems across insurance quoting, healthcare prescribing, pharmacy and warehouse operations, and banking/fintech. I focus on framework/platform-level work—shared utilities, testing and Storybook harnesses, linting and build setup—so teams can move faster without sacrificing quality, accessibility, or compliance.…Frontend engineer with 18 years of experience building and modernising high-stakes, regulated systems across insurance quoting, healthcare prescribing, pharmacy and warehouse operations, and banking/fintech. I focus on framework/platform-level work—shared utilities, testing and Storybook harnesses, linting and build setup—so teams can move faster without sacrificing quality, accessibility, or compliance.

Colin Sergay

Software Engineer, Front-End Developer, Back-End Developer, +2

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Frontend engineer with 18 years of experience building and modernising high-stakes, regulated systems across insurance quoting, healthcare prescribing, pharmacy and warehouse operations, and banking/fintech. I focus on framework/platform-level work—shared utilities, testing and Storybook harnesses, linting and build setup—so teams can move faster without sacrificing quality, accessibility, or compliance.…Frontend engineer with 18 years of experience building and modernising high-stakes, regulated systems across insurance quoting, healthcare prescribing, pharmacy and warehouse operations, and banking/fintech. I focus on framework/platform-level work—shared utilities, testing and Storybook harnesses, linting and build setup—so teams can move faster without sacrificing quality, accessibility, or compliance.

Available to hire

Frontend engineer with 18 years of experience building and modernising high-stakes, regulated systems across insurance quoting, healthcare prescribing, pharmacy and warehouse operations, and banking/fintech. I focus on framework/platform-level work—shared utilities, testing and Storybook harnesses, linting and build setup—so teams can move faster without sacrificing quality, accessibility, or compliance.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

Senior Software Engineer at IAG (via Hays)

September 1, 2025 - Present

Rebuilding IAG's insurance quote generator and migrating the customer-facing frontend from a legacy codebase onto React and TypeScript. Improved test and Storybook harnesses so developers can build and review components in isolation rather than loading the whole application. Added shared utilities to remove duplicated code across the team. Reworked ESLint configuration and automated testing workflows so issues are detected before code review. Mentored and upskilled junior and graduate developers. Delivery required enterprise compliance for regulated product disclosure and accessibility.

Senior Software Engineer at Culinary Wonderland

February 1, 2025 - August 31, 2025

Migrated the site from an overengineered CMS to Strapi, reducing maintenance burden and enabling the content team to work effectively. Rebuilt the architecture and decomposed an inherited monolith so a small team could move quickly. Built a prototype for SuChef, an AI assistant for the culinary side of the product, using Next.js, React, Tailwind, and AWS.

Senior Software Engineer at Canngea

April 1, 2023 - September 30, 2025

Built the pharmacy management platform end to end, including patient records, scripts and orders, integrating with Xero and Eway for payments and AusPost/StarTrack for delivery. Designed and built a Warehouse Management System from scratch to meet tracking and audit requirements for controlled substances supply chain. Created a React frontend tailored to pharmacy and warehouse workflows rather than the underlying database layout. Ran AWS infrastructure (EC2, S3, RDS) and implemented CI/CD with CodePipeline and CodeBuild to make releases routine.

Senior Software Engineer at ClearPoint (Client: Westpac)

August 1, 2021 - March 31, 2023

Rebuilt Westpac's loan and mortgage components to reduce page weight and fix interactions that were losing customers. Created a proof of concept for the executive team that showed how a legacy component library could evolve, leading to funding. Migrated always-on infrastructure to AWS Lambda and API Gateway to reduce unused capacity costs. Mentored junior and graduate developers on the front-end stack.

Software Engineer at Derivco Australia

July 1, 2019 - August 31, 2021

Delivered a greenfield betting platform handling high transaction volume and requiring high uptime. Built a reusable design system and state architecture to reduce time to ship new features. Used DynamoDB and CloudFront to keep latency low for users across multiple regions.

Software Engineer at Flare HR

October 1, 2016 - February 28, 2019

Built an HR platform that handled payroll and leave for multiple companies on one system. Implemented leave management with a dynamic calendar that corrected accrual calculations. Led the front-end migration to a modern framework while maintaining ongoing feature delivery.

Software Engineer at Investec

May 1, 2015 - October 31, 2016

Built a customer onboarding prototype that reduced a manual process into a single flow. Made internal systems responsive so staff could use them away from a desk.

Software Engineer at Gmaven

April 1, 2013 - April 30, 2015

Small startup where ownership covered requirements through to production. Performed front-end work using TDD/BDD and continuous integration.

Senior Web Developer at Careers24

March 1, 2011 - April 30, 2013

Built C# .NET web applications on a high-traffic job board.

Junior Developer at Osiris Trading

October 1, 2008 - November 30, 2010

Junior Developer at Innovation Group

September 1, 2007 - June 30, 2008