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

Full-stack software engineer with first-class honours in Computer Science and hands-on experience building and shipping production software. Comfortable across the stack—from React/TypeScript front ends to C#/.NET backend services—with a strong focus on testing, CI/CD, code review, and production support. Delivery-focused and detail-oriented, I build user-focused, scalable systems and enjoy end-to-end ownership, including troubleshooting incidents across AWS environments and collaborating across teams to improve development workflows.…Full-stack software engineer with first-class honours in Computer Science and hands-on experience building and shipping production software. Comfortable across the stack—from React/TypeScript front ends to C#/.NET backend services—with a strong focus on testing, CI/CD, code review, and production support. Delivery-focused and detail-oriented, I build user-focused, scalable systems and enjoy end-to-end ownership, including troubleshooting incidents across AWS environments and collaborating across teams to improve development workflows.

Sean Culleton

Full Stack Developer, Web Developer, Software Engineer, +2





Full-stack software engineer with first-class honours in Computer Science and hands-on experience building and shipping production software. Comfortable across the stack—from React/TypeScript front ends to C#/.NET backend services—with a strong focus on testing, CI/CD, code review, and production support. Delivery-focused and detail-oriented, I build user-focused, scalable systems and enjoy end-to-end ownership, including troubleshooting incidents across AWS environments and collaborating across teams to improve development workflows.…Full-stack software engineer with first-class honours in Computer Science and hands-on experience building and shipping production software. Comfortable across the stack—from React/TypeScript front ends to C#/.NET backend services—with a strong focus on testing, CI/CD, code review, and production support. Delivery-focused and detail-oriented, I build user-focused, scalable systems and enjoy end-to-end ownership, including troubleshooting incidents across AWS environments and collaborating across teams to improve development workflows.

Available to hire

Full-stack software engineer with first-class honours in Computer Science and hands-on experience building and shipping production software. Comfortable across the stack—from React/TypeScript front ends to C#/.NET backend services—with a strong focus on testing, CI/CD, code review, and production support.

Delivery-focused and detail-oriented, I build user-focused, scalable systems and enjoy end-to-end ownership, including troubleshooting incidents across AWS environments and collaborating across teams to improve development workflows.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Beginner

Language

English

Advanced

Work Experience

Full Stack Software Engineer at Fenergo

September 1, 2025 - September 1, 2026

Built full-stack features on a large micro-frontend platform, delivering React/TypeScript UI work (Formik, Material UI, custom editors) alongside C#/.NET backend services (REST APIs, AWS Lambda, and a transform/execution layer). Owned work items end to end: investigation, root-cause analysis, implementation, and verification. Developed internal AI agents and Model Context Protocol (MCP) tools to automate and speed up team workflows. Managed CI/CD through Azure DevOps pipelines, including versioning/changelogs, maintaining green builds, diagnosing pipeline failures, and performing production builds and deployments. Wrote and maintained unit, component, and end-to-end tests using Jest, Cypress, and Playwright, keeping quality gates green prior to merges. Carried on-call responsibility (PagerDuty) for production support across ~20 AWS accounts, using CloudWatch Logs Insights and AWS X-Ray to trace alarms to the correct service and identify root causes.

Software Engineering Intern at Accenture

January 1, 2024 - September 1, 2024

Collaborated on a client business-change team to overhaul development and testing processes. Worked with cross-functional stakeholders to gather requirements, define workflows, and implement process improvements. Assisted in the design and testing of system components aligned to client business objectives. Contributed to deployment of new testing frameworks and methodologies to improve development cycle efficiency, gaining experience in SDLC, change management, and client interaction in a high-pressure environment.