Open to opportunities

Harrison Collins

@harrisoncollins

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Senior Java backend engineer focused on scalable, reliable systems.

United States

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What I'm looking for

I’m seeking a senior backend role where I can build reliable, scalable services, improve CI/CD and observability, mentor engineers, and tackle high-throughput production systems.

I’m a senior Java backend engineer with over a decade building high-traffic, backend-heavy systems—moving monoliths to microservices, operating Kafka-based streaming, and delivering production services that just work under pressure. I prioritize clean code, fast deploys, scalable architectures, and mentoring engineers to raise team standards.

At recent roles I built Spring Boot microservices supporting high throughput (~15K TPS), cut deploy times by 60% through CI/CD automation, reduced DB load with Redis caching, and implemented monitoring with Prometheus and the ELK stack. I seek to bring pragmatic engineering, operational reliability, and hands-on leadership to teams shipping critical systems.

Experience

Work history, roles, and key accomplishments

Current

Lead Backend Engineer

Current

CircuitPay

Jul 2023 - Present (2 years 11 months)

Built Spring Boot microservices and Kafka-based pipelines for a high-volume digital payment gateway (peak ~15K TPS), cut deploy times 60% by migrating to Jenkins+Docker, and reduced DB hits 45% via Redis caching while leading a team of 4 engineers.

Java Spring Boot Apache Kafka Docker Jenkins Redis Prometheus ELK Microservices

Senior Java Developer

ShopGrid Labs

Apr 2019 - Jun 2023 (4 years 2 months)

Rewrote a legacy monolith into Spring Boot microservices covering six major features and built REST APIs supporting ~$80M annual transactions; optimized Hibernate queries to halve query times and delivered 90%+ test coverage for critical flows.

Java Spring Boot PostgreSQL Hibernate REST APIs Stripe Integration Junit Mockito Microservices

Java Developer

DevPilot Systems

Jan 2017 - Mar 2019 (2 years 2 months)

Developed Spring-based HR/payroll tools supporting 800+ staff, migrated SVN to Git with branching strategies, and automated monthly reporting to save finance 10 hours/month while building responsive JSP UIs.

Java Spring JDBC JSP Git SQL Automation)Reporting Automation

Backend Java Engineer

SoftBridge Solutions

Sep 2014 - Dec 2016 (2 years 3 months)

Implemented backend CRM modules and REST integrations for education and healthcare clients, automated infrastructure with Terraform and Ansible, and introduced logging/monitoring via Logstash and Kibana.

Java REST APIs Terraform Ansible Logstash Kibana Monitoring