Sean M.
Principal Engineer - Developer Experience (Remote) @Consumer Cellular, Inc.
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WORK HISTORY
Principal Engineer - Developer Experience (Remote) @Consumer Cellular, Inc.
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
Suffolk County Community College
Computer Science
SKILLS
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
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