Open to opportunities

Colin Billing

@colinbilling1

Message

Senior full-stack engineer specializing in Python backends and React frontends.

United States

Message

What I'm looking for

I seek senior engineering roles building scalable, cloud-native web platforms where I can lead architecture, mentor teams, and improve reliability.

I am a Senior Full-Stack Engineer with 10+ years building high-performance web applications across healthcare, e-commerce, and enterprise SaaS. I specialize in React and Next.js frontends paired with scalable Python backends (Django, FastAPI), designing secure APIs and real-time features.

I deliver cloud-native solutions on AWS and GCP, leveraging serverless, containers, and infrastructure-as-code to optimize performance and cost. I’ve led architecture reviews, authored reusable Terraform modules, and implemented high-throughput pipelines that process millions of events per day while reducing operational spend.

I mentor engineers, run hands-on workshops, and align technical execution with business goals. My work emphasizes observability, testing, and maintainable engineering practices to ensure reliable, scalable products.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

UNHCR, The UN Refugee Agency

Jan 2024 - Aug 2025 (1 year 7 months)

Led cloud-native Python backends (FastAPI) and React/Next.js frontends, standardizing API ingress and security while processing millions of events/day and reducing operational spend ~30% via stream and serverless optimizations.

Python fastAPI React PostgreSQL Redis Terraform Celery WebSockets

Senior Software Engineer

Zayo Group

Aug 2021 - Dec 2023 (2 years 4 months)

Delivered FastAPI microservices and modular React UIs, implemented payments and identity flows, and improved release automation to cut release time by ~35% while enhancing observability and cost controls.

fastAPI React AWS S3 Cloudfront DynamoDB Stripe GitHub Actions)Docker OpenTelemetry

Software Engineer

Percona

Jun 2017 - May 2021 (3 years 11 months)

Extended Python web platforms and ETL pipelines, optimized SQL and reporting (hours→minutes), and introduced Celery-based async processing to improve reliability and reduce errors.

Python SQL Celery Redis Docker Pytest Prometheus Grafana

Software Engineer

Thryv

Apr 2014 - Mar 2017 (2 years 11 months)

Built Python-based data processing and reporting services, replaced legacy components to cut incidents ~30%, and introduced React components and CI practices to improve maintainability and QA.