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Senior Infrastructure Developer (.NET/C#)

United States, Framingham Employment contract 142000.00 - 192000.00 USD / Year · Job Posted June 02, 2026
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Job Description

As a Senior Infrastructure Developer (.NET/C#), you will play a pivotal role in designing, building, and evolving our internal private cloud and infrastructure platforms at enterprise scale. You will deliver secure, resilient, and observable .NET/C# services, background workers, APIs and automation that support thousands of users and critical systems. The role partners closely with solution architects, network engineering, security, and operations teams to deliver pragmatic, production‑ready solutions that balance speed, safety, and long‑term maintainability. Operating with significant autonomy, this role applies deep expertise in platform engineering, networking, and enterprise systems to develop the services that operate behind the scenes to perform reliably across complex corporate networks, security controls, and compliance requirements.

Job Responsibility

  • Design, build, and maintain production‑grade .NET/C# services, APIs, and background workers (REST, gRPC, asynchronous processing) that integrate with enterprise infrastructure systems such as networking services, virtual machines, identity platforms, secrets management, CMDBs
  • Develop internal platform tools, reusable libraries, SDKs, CLIs, and templates that enable consistent, scalable delivery across engineering teams
  • Apply modern software engineering patterns including dependency injection, configuration management, async/await, structured error handling, and API versioning
  • Build software that operates reliably across enterprise network environments, accounting for proxies, firewalls, NAT, load balancers, DNS behavior, and latency constraints
  • Implement secure transport mechanisms including TLS/mTLS, certificate handling, and diagnostics for network‑related failures
  • Instrument services using OpenTelemetry and related tooling to produce actionable metrics, logs, and distributed traces
  • Define and implement health checks, SLIs/SLOs, retries, timeouts, circuit breakers, and resilience patterns
  • Participate in on‑call rotations, incident response, root‑cause analysis, and post‑incident reviews
  • drive durable fixes rather than temporary mitigations
  • Perform capacity planning, performance tuning, and operational readiness reviews
  • Apply security‑by‑default principles including least‑privilege access, secure service‑to‑service authentication, and safe secret handling (e.g., CyberArk, Azure Key Vault)
  • Implement OAuth2/OIDC authentication flows and service principal‑based access models
  • Ensure solutions align with enterprise compliance requirements (e.g., SOX, PCI, ISO‑aligned controls) and change management processes
  • Contribute to CI/CD pipelines using Git‑based workflows (e.g., Azure DevOps, GitHub Actions)
  • Develop and maintain infrastructure‑as‑code using Terraform, Bicep, or ARM templates to enable repeatable, auditable deployments across environments
  • Support multi‑environment promotion strategies and operational readiness for production releases
  • Produce clear and actionable technical documentation including runbooks, architecture decision records (ADRs), and developer guides
  • Mentor and coach less experienced engineers, promoting best practices in platform, reliability, and secure software design

Requirements

  • Bachelor’s Degree in Computer Science, Engineering, a related field, or equivalent work experience
  • 8+ years of hands-on experience developing production-grade .NET (C#) services & background workers for Infrastructure and/or Compute Systems
  • Experience building and operating REST or gRPC APIs at scale
  • Strong knowledge of networking fundamentals, CI/CD pipelines using Git-based workflows, .NET Core Entity Framework (EF Core), and SQL design and querying

Nice to have

  • 10+ years in enterprise software or platform engineering
  • Experience developing internal developer platforms, reusable libraries and golden paths
  • Operating services on both Windows and Linux
  • Proven experience with observability tools, integrating with databases (SQL Server or Postgres) and enterprise messaging platforms
  • Experience with enterprise PKI, certificate automation, and rotation
  • Experience with infrastructure-as-code (IaC) tools (Terraform, Bicep, ARM)
  • Hands-on experience with performance profiling, capacity planning, and resilience patterns
  • Familiarity with Zero Trust architectures, network segmentation, containers, Kubernetes, and SRE practices

What we offer

  • Competitive base salary + bonus on eligible positions
  • 22 days plus 7 major holidays and 1 floating holiday
  • Company match 401(k) plan
  • Online and retail discounts
  • Physical and mental health wellness programs
  • Daycare, cafeteria, fitness center, and coffee shop at our HQ

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