Senior Backend .NET Engineer (Hardware Integration & Peripheral Services)

Key Responsibilities

● Device Services Architecture: Architect, refactor, and build robust backend system services,

background workers, and Windows Services using .NET 8 / .NET Core and C# to manage complex

device lifecycles.

● Peripheral & Hardware Integration: Integrate, maintain, and interface with vendor-specific SDKs,

native APIs, and drivers for physical hardware components (e.g., credit card processing terminals,

thermal printers, scanners, and sensory peripherals).

● Low-Level System Communication: Author low-latency communication layers utilizing serial

protocols (RS-232/COM), USB, HID, TCP/IP sockets, and native system APIs (Win32/UWP APIs) to

communicate with device firmware.

● Fault Tolerance & Reliability: Engineer fault-tolerant state machines, hardware error handling,

fallback logic, and automatic reconnection mechanisms to guarantee maximum operational uptime

in production environments.

● System Refactoring & Modernization: Modularize and refactor monolithic device drivers and

legacy backend codebases into clean, decoupled, and testable service abstractions.

● PCI & Compliance Standards: Ensure peripheral transactions and peripheral data flows adhere

strictly to security standards, PCI compliance, and hardware-level encryption protocols.

Required Qualifications & Technical Skills

● Experience: 5+ years of professional backend software engineering experience with C# and

the .NET ecosystem (.NET Core / .NET 8 / .NET Framework).

● Hardware Integration Expertise: Demonstrated experience building software that interfaces with

physical hardware devices, external peripherals, or IoT devices via vendor-specific SDKs and APIs.

● Low-Level & System Services: Deep technical background in authoring Windows Services,

background workers, multithreaded systems, and asynchronous messaging architectures.

● I/O Protocols: Familiarity with hardware communication protocols and APIs (Serial/COM, USB,

HID, TCP/IP, Win32 APIs).

● Code Quality & Testing: Proven track record of writing unit/integration tests for hardware

abstraction layers, leveraging dependency injection, and using Git-based CI/CD workflows.

Core Competencies & Cultural Fit

● Self-Motivated Learner: Eager to dive deep into unfamiliar hardware SDKs, vendor documentation,

and low-level system protocols to solve complex technical problems.

● Strong Individual Contributor: Able to take ownership of end-to-end device integration pipelines,

troubleshoot physical/hardware edge cases, and execute independently with minimal supervision.

● Reliable Team Player: Values transparent communication and collaborates effectively with

backend architects, QA teams, and technical operations.

● Remote-Ready Communicator: Clear, prompt, and detailed technical communication across

asynchronous tools (Slack, Teams) and task tracking platforms (Jira, Azure DevOps).

Preferred / "Nice-to-Have" Qualifications

● Experience with POS (Point of Sale) systems, payment terminal integration (PCI-DSS compliance,

EMV processing), or self-service terminal/kiosk architectures.

● Familiarity with C/C++ interop (P/Invoke) or native C-DLL wrappers within .NET applications.

● Understanding of diagnostic logging, telemetry, and remote hardware monitoring frameworks.

● AI-Assisted Development: Proficiency in utilizing AI-driven tools (e.g., GitHub Copilot, Cursor,

Claude Code) to analyze legacy drivers, mock peripheral interfaces for testing, and accelerate

development.