Senior Software Engineer

Senior C# Developer

About Our Client

Our client is a premier software provider powering global logistics and postal transaction platforms. Known for high-concurrency systems and modern engineering architectures, they are currently scaling their engineering capabilities to support next-generation enterprise initiatives involving .NET, WebAssembly, and AI-driven automation.

Role Overview

As the Senior C# Developer, you will drive the development of the Journey Engine platform—a high-performance .NET runtime environment compiled to WebAssembly. Sitting in a strategic engineering sweet spot, you will act as a battle-tested execution partner alongside the Chief Architect, building robust component logic, optimizing state machine workflows, and delivering high-quality code within an agile team setting.

Main Responsibilities

• Lead the engineering and delivery of the Journey Engine platform component.
• Translate technical specs into system designs and Jira user stories while maintaining high standards for correctness and performance.
• Design stable contracts, APIs, and versioning interfaces between engine and host runtimes.
• Drive comprehensive automated testing strategies and resolve cross-layer technical bugs.
• Collaborate seamlessly as a supportive, execution-focused team player within a multi-disciplinary engineering group.
• Engage in peer code reviews, continuous delivery optimization, and team mentoring.

Must-Haves

• Deep C# / .NET Core Proficiency: Substantial track record delivering complex software services or components from scratch.
• Team Player Orientation: Highly collaborative, execution-focused mindset focused on aligning with existing architectural vision.
• Contract-Driven Design: Experience working with JSON/JSON Schema, stable public APIs, and reusable libraries/SDKs.
• DevOps Practice: Hands-on experience with Git workflows and automated CI/CD pipelines (GitHub Actions or Azure DevOps).
• AI Tooling Mindset: Strong passion and excitement for integrating AI tools into daily coding workflows.
• Security & Location: Ability to meet client security clearance requirements and work hybrid on-site in Boston, MA.

Nice-to-Haves

• Claude Experience: Direct experience or practical background utilizing Claude AI models/tooling.
• WebAssembly (WASM): Exposure to WebAssembly or .NET/JavaScript interoperability (a huge plus!).
• Engine / Workflow Systems: Experience with workflow engines, rule engines, state machines, or high-performance runtimes.
• Frontend Knowledge: Basic knowledge of TypeScript or frontend frameworks.

Compensation & Work Model

• Salary Range: $115,000 – $140,000 USD base salary per year
• Bonus: 5% annual bonus potential
• Work Model: Hybrid (2 days/week on-site at Boston, MA office; 3 days remote)
• Benefits: Full standard corporate benefits package

📩 How to Apply

If this sounds like a strong fit for your background and you meet the must-have qualifications, please forward your CV directly to me at:

📧 [email protected]

This post is for existing and upcoming vacancies