Justin Campbell

justin@justincampbell.me
github.com/justincampbell
cal.com/justincampbell

GitHub
Staff Software Engineer

Remote
08/2022 – 02/2025 (2½ years)

Go, Ruby, Rails, OpenAI, Kafka, Twirp/Protobuf, Kubernetes, Azure, Kusto, Datadog

• Copilot (and also Copilot Business/Copilot Enterprise)
  • Designed user configuration storage and propagation.
  • Added Copilot support to “GitHub Enterprise Cloud with data residency”, allowing those customers to keep Copilot data in their preferred region.
  • Implemented hostname-based SKU isolation for GitHub Enterprise customers.
• Copilot Custom Models
  • Architected and implemented customer model authorization and routing system.
  • Directed a staffship program, delivering a custom Copilot model to all GitHub staff.
  • Created data pipelines and dashboards, enabling custom model telemetry to be discoverable by the Product and Sales teams.
  • Analyzed customer telemetry/acceptance rate of candidate models and suggested training improvements.
  • Managed QA program for finding bugs and edge cases before private customer beta.
• Copilot Availability Champ
  • Responsible for ensuring and improving the uptime of all Copilot experiences.
  • Improved observability and monitoring of Copilot services.
  • Ran weekly availability review meeting and produced reports of Copilot availability for leadership.

Passio AI
Senior Software Engineer

Remote
01/2022 – 04/2022 (3 months)

Go, React, GCP

• Introduced CI/CD, unit tests, and feature flags to existing Go microservices codebase.

VTS (Open Throttle)
Senior Software Consultant

Remote
11/2020 – 12/2021 (14-month contract)

Ruby, Rails, React

• Software consultant engaged on a Rails/React projects for a Commercial Real Estate software platform.
• Oversaw architecture and implementation for new product features using gRPC and ElasticSearch.

HashiCorp
Senior Software Engineer

Remote
03/2015 – 11/2020 (5½ years)

Go, Ruby, Rails, Ember.js, AWS, Heroku

• Shipped Terraform provider functionality in the Terraform Registry, which allows provider authors to self-publish Terraform providers, improves installation UX for end-users, and drastically expands the Terraform ecosystem.
• Acted as Engineering Lead on 2 different Terraform products.
• Managed project planning for a team of 7.
• Built much of the early functionality end-to-end for Terraform Cloud (formerly Atlas/Terraform Enterprise).

Sungard Availability Services (PromptWorks)
Senior Software Consultant

Philadelphia, PA
01/2014 – 03/2015 (15 months)

Ruby, Rails, Python, Django, OpenStack

• Helped create a cloud management platform on top of OpenStack.

Comcast (Sungard Consulting Services)
Software Consultant

Philadelphia, PA
07/2013 – 12/2013 (6-month contract)

Ruby, Rails

• Built IoT portal for Comcast Xfinity Home customers.

Riot Games (Mashion)
Software Consultant

Remote
10/2012 – 06/2013 (9-month contract)

Ruby, Chef

• Built open-source Chef tooling (Berkshelf) using Ruby.
• Worked with other teams to prescribe a process for automating their infrastructure.

Cramer Dev
Software Engineer

Remote
02/2012 – 09/2012 (8 months)

Ruby, Rails

• Worked on client projects to deliver features.
• Helped build and launch a Rails app serving 125 requests/sec.
• Focused on testing, good object-oriented design, and agile development.

Movitas
Software Engineer

Bryn Mawr, PA
12/2010 – 02/2012 (15 months)

Ruby, Rails, AWS

• Built VoIP solution using Asterisk.
  • Dashboard and API built with Rails.
  • Dialplan logic written in Ruby (Adhearsion).
  • Deployed on Amazon Web Services (EC2, ELB, RDS, AS).
• Directed development of iPhone applications.
• Helped improve overall development process.

Volpe and Koenig, P.C.
Systems Engineer

Philadelphia, PA
06/2007 – 12/2010 (3½ years)

• Virtualization (VMware ESX, EqualLogic SAN).
• Purchased and supported Cisco IP telephony system (CUCM, Unity).
• Design and project management of datacenter buildout.
• Redesigned network (30+ Cisco devices, Catalyst 4500, wireless).
• VPN/Branch offices.
• Custom web apps (PHP/CodeIgniter/jQuery).
• Exchange, SQL.

CIGNA/Intracorp
Application Support Engineer

Philadelphia, PA
05/2006 – 04/2007 (1 year)

GHR Systems
Desktop Support Engineer

Wayne, PA
12/2004 – 01/2006 (14 months)

U-Combination Technology
Project Manager

Plymouth Meeting, PA
09/2003 – 10/2004 (13 months)