Sean M.

About Sean M.

Principal engineer building platform infrastructure and developer tooling at Consumer Cellular. 9 years on the same codebase across three role changes: IC, tech lead, engineering manager, now principal. Deep domain context in telecom billing, provisioning, carrier integrations, and customer management.Currently own the company\'s GitHub governance platform (Ansible, GitHub Actions, Python) declarative infrastructure-as-code managing 675+ repositories across 4 organizations with automated RBAC, idempotent reconciliation, and AWS OIDC federation. Built the developer experience program alongside it: release automation, code quality standards, CI/CD pipelines for application teams, and cross-repo build tooling.Growing practice in AI/LLM systems engineering: multi-agent orchestration, adversarial review patterns, code-enforced permission boundaries, safety-as-code, and feedback loop architecture. Built a multi-agent pipeline that shipped 23 features across 31 sprints with 942 tests — nights and weekends, not a demo.I break down monolithic problems into focused, well-bounded solutions. Codebases, organizational processes, and the tooling gaps between them. I\'ve led teams, mentored engineers, and built hiring processes. I care about developer experience because I\'ve lived the friction that bad tooling creates.Python · Ansible · GitHub Actions · AWS · Docker · C# ·.NET Core · SQL · Claude API · Copilot SDK

Experience

1. Principal Engineer - Developer Experience (Remote)

   Consumer Cellular, Inc.

   Apr 2023 — Present · Portland, OR, US

   Recruited back at the principal level to modernize the development platform and drive enterprise-wide engineering governance for this PE-backed telecom company.Built an enterprise GitHub governance platform from scratch using Ansible and GitHub Actions — growing from a single organization to 4 organizations and 675+ repositories under declarative, YAML-driven management. Replaced legacy credentials with scoped application-based authentication, implemented automated access-control reconciliation with idempotent change detection, and extended the platform with AWS OIDC federation enabling CI/CD pipelines to assume cloud IAM roles without long-lived secrets across multiple business units.Created the company\'s developer experience program, identifying organizational gaps in release automation, code standards, and build tooling — then designing and shipping solutions adopted across the engineering organization. Delivered release-candidate automation that eliminated manual branch merges, established code quality and testing standards, built cross-repo build tooling serving 23+ repositories, and authored CI/CD pipelines enabling application teams to run builds on private runners.Hardened the platform for production scale: parallel batch processing to bypass CI system limits, custom Ansible modules with rate-limit-aware retry logic, structured audit logging across all mutating operations, idempotency guards for policy management, and a containerized pipeline worker for reproducible execution.Established AI/LLM engineering practices spanning organizational governance and applied system design — multi-agent orchestration with adversarial review patterns, code-enforced permission boundaries, feedback loop architecture, externalized safety-as-code configuration, and structured lineage tracking.

Education

• Rochester Institute of Technology

  Computer Science

  2006 — 2009

• Suffolk County Community College

  Computer Science

  2005 — 2006

Skills

• Data Management
• Software Development Life Cycle (Sdlc)
• Java
• Xsd
• Software Development
• Subversion
• Sas Programming
• Windows
• Web Services
• C#
• .net
• Javascript
• Xml Schema
• Agile Project Management
• C++
• Business Analysis
• Xml
• Database Design
• Requirements Analysis
• Big Data Analytics
• Software Project Management
• Algorithm Analysis
• Test Driven Development
• Algorithm Development
• Microsoft Sql Server
• Cross-Functional Team Leadership
• Solution Architecture
• Sql Server Integration Services (Ssis)
• Jira
• Databases
• Business Process Improvement
• Agile Methodologies
• Team Building
• Performance Testing
• Sql
• Linux
• Asp.net
• Css
• Git
• Program Implementation