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I'm a dedicated software professional with over 15 years of experience in the software industry. I excel at problem solving and have a keen eye for detail. I'm known for creativity in intuitive user interfaces and am comfortable across a broad spectrum of technologies. I bring a collaborative, user-focused approach to every project and consistently strive for robust, scalable outcomes.…

Justin Vallelonga

Full Stack Developer, Web Developer, Programmer, +3

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I'm a dedicated software professional with over 15 years of experience in the software industry. I excel at problem solving and have a keen eye for detail. I'm known for creativity in intuitive user interfaces and am comfortable across a broad spectrum of technologies. I bring a collaborative, user-focused approach to every project and consistently strive for robust, scalable outcomes.…

Available to hire

I’m a dedicated software professional with over 15 years of experience in the software industry. I excel at problem solving and have a keen eye for detail.

I’m known for creativity in intuitive user interfaces and am comfortable across a broad spectrum of technologies. I bring a collaborative, user-focused approach to every project and consistently strive for robust, scalable outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Aragonese

Advanced

Javanese

Advanced

English

Fluent

Work Experience

Full Stack Developer at Independent Contractor (Various Clients)

September 1, 2023 - Present

Full stack development focusing on Ruby on Rails and PHP ETL pipelines with high concurrency requirements. Worked with Go/Golang and MongoDB, PostgreSQL, and cloud/gateway tooling to build scalable microservices and data workflows.

Backend Developer (Golang) at Independent Contractor (Various Clients)

January 1, 2022 - September 1, 2023

Backend Golang development using Go kit. Designed and implemented database and system architecture for microservices, built on a MongoDB database.

Backend Developer

October 1, 2018 - December 1, 2021

Backend Node.js development on a small team. Worked on database design and back-end architecture. Developed a flexible authorization system to fit varying internal needs.

Software Engineer at SpotX

July 1, 2017 - April 1, 2018

Full stack development in an Agile environment using AngularJS and PHP. Contributed to platform features and tooling.

Software Engineer

March 1, 2014 - April 1, 2017

Backend development on Ruby on Rails. Extended and maintained notifications system within the platform. Added OAuth consumer and provider functionality for authentication. Built an analytics tool for viewing usage metrics with Polymer, Node.js, and PostgreSQL. Collaborated with QA to ensure quality before releases.

Software Engineer at Mercury Payment Systems

November 1, 2011 - March 1, 2014

Developed front-end in C# for a payment platform, performed extensive troubleshooting and optimization. Created a web admin interface for monitoring call queues and Stand-In behavior of payment front-ends.

Quality Assurance Engineer at Mercury Payment Systems

April 1, 2010 - November 1, 2011

Manual and automated testing of web-based and desktop payment software. Built keyword-driven QA framework using C# and developed internal tools to support testing.

Independent Contractor / Software Engineer at Independent Contractor (various clients)

September 1, 2023 - Present

Freelance/full-stack development focusing on Ruby on Rails and PHP ETL, with high-concurrency rewrites achieving ~400% speed improvements. Worked with Go (Golang), PostgreSQL, and data-sharing platforms; designed a flexible authorization system and contributed to product direction across engagements.

Senior Software Engineer at Go Kit / Backend Projects

January 1, 2022 - September 30, 2023

Backend Golang development using Go Kit; designed database and system architecture for microservices; contributed to data pipelines and service decomposition.

Senior Software Engineer at SpotX

October 1, 2018 - December 31, 2021

Backend Node.js development; database design and backend architecture; implemented flexible authorization; Golang data aggregation for a data-sharing platform; high-concurrency processing with NATS and MongoDB handling millions of records.

Software Engineer at Google

March 1, 2014 - April 30, 2017

Full stack backend development using Ruby on Rails; extended and maintained notifications system; added OAuth consumer/provider for authentication; built analytics tooling with Polymer, Node.js, and PostgreSQL.

QA Engineer at Mercury Payments Systems (World Pay)

April 1, 2010 - November 1, 2011

Manual and automated testing of web-based and desktop payment software; developed keyword-driven QuickTest framework; created admin panel monitoring tools; improved debugging workflow time via internal tooling.

Software Engineer at Mercury Payments Systems (World Pay)

November 1, 2011 - March 1, 2014

Created a highly configurable website for monitoring call queues and supported the 'Stand-In' behavior of payment front ends; extended admin tooling; improved time-to-debug by ~25%.