Senior Platform Engineer (.Net​/C#

Staples is business to business. You’re what binds us together.

Join a team of passionate, collaborative, and inventive professionals at Staples Digital Solutions. We are customer‑centric, agile, and results‑oriented problem solvers who anticipate the needs of our business partners and deliver reliable technology services. Our culture values intellectual curiosity, teamwork, and adaptability, creating an environment where technology advancements drive the company forward.

As a Senior Platform Engineer, you will play a pivotal role in designing, building, and evolving internal private cloud and infrastructure platforms at enterprise scale. You will deliver secure, resilient, and observable .NET services and automation that support thousands of users and critical systems, partnering with architects, network engineering, security, and operations teams to drive impactful, production‑ready solutions. Operating with significant autonomy, this role applies deep expertise in platform engineering, networking, and enterprise systems to develop solutions that perform reliably across complex corporate networks, security controls, and compliance requirements.

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.

• Design, build, and maintain production‑grade .NET (C#) services, APIs, and background workers (REST, gRPC, asynchronous processing) that integrate with enterprise systems such as identity platforms, networking services, secrets management, CMDBs, and ticketing systems.
• Develop internal platforms, 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 Open Telemetry 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., Cyber Ark, 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 Dev Ops, Git Hub 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.

• You have strong systems thinking focused on operability, maintainability, and security.
• Your pragmatic approach balances ideal design with real‑world enterprise needs.
• You demonstrate ownership, accountability, and excellent…