Open to opportunities

Justin John

@justinjohn

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Software Engineer

Denmark

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What I'm looking for

I’m looking for a team where I can build scalable web and cloud-native systems, deliver secure, high-performance products, and keep improving through professional growth—while mentoring others in clean architecture, DevOps, and Agile delivery.

A highly dynamic, hardworking and passionate Software Engineer committed in delivering excellent work output by utilizing the 10+ years of experience in developing web, mobile, and desktop applications with the pursuit of professional and technical advancement as well as help achieve organizational goals.

Experience

Work history, roles, and key accomplishments

Software Engineer

Pocket Change Inc

Aug 2021 - Mar 2026 (4 years 7 months)

Built high-performance frontends with Next.js and Angular/React, integrating GraphQL APIs to deliver AI-powered dashboards. Implemented OAuth2.1/OpenID Connect and Go-based BFF services, improved API performance with Redis and PostgreSQL query tuning, and deployed scalable hybrid cloud infrastructure on AWS/Azure with Kubernetes and CI/CD automation.

Next.js Angular React GraphQL OAUTH2 OpenID Connect Go Redis PostgreSQL Kubernetes

Software Developer

Sprobe Inc

Feb 2018 - Jul 2021 (3 years 5 months)

Led a team of three developers and delivered new applications while maintaining legacy systems through bug fixes and refactoring. Built responsive UIs with React/Angular, Redux, and TypeScript, optimized PostgreSQL performance to reduce report generation time, and automated backend build/test/release workflows with Git, Docker, and Azure DevOps CI/CD pipelines.

React Angular Redux TypeScript PostgreSQL CI CD Git Docker Azure DevOps Performance Tuning

Software Engineer

Sprasia Inc

Jan 2018 - Jul 2021 (3 years 6 months)

Developed SPAs using Angular and React (TypeScript) and bootstrapped projects with an offshore team, including CI/CD setup using Phabricator and Jenkins. Built internal Go services for AWS S3 bucket cleanup, performed code reviews, and led technical mentoring across teams with a focus on React, Python, PHP, SOLID, clean code, and test automation.