We have a working AI Proof of Concept (PoC) that proves our vision; now we need the engine that powers the product at scale. As our Senior Software Engineer, you will be the lead architect and primary builder of our production-grade, AI-first .NET platform.
Working directly with the Head of Technology, you will be responsible for moving us from experimental scripts to a robust, observable, and scalable Agentic AI Architecture. We are a high-velocity team that values "Ship Fast, Fix Fast." We utilize agentic AI tools like Claude Code to bypass the boilerplate, freeing you to focus on the high-value architectural challenges of a production-ready system.
What You’ll Do
- Productionize AI Workflows: Transform raw AI prompts and experimental logic into resilient production code using .NET 10/C# 14.
- Architect Agentic Systems: Design and build the "Agent Loops" (Planning → Execution → Observation) that allow our AI to interact reliably with our internal databases and external APIs.
- Build for Reliability: Implement "Evals" and Guardrails to manage the non-deterministic nature of LLMs, ensuring outputs are safe, accurate, and consistent for our users.
- Cloud Infrastructure: Partner with the Head of Tech to design and deploy the Azure/AWS infrastructure required to support high-concurrency AI workloads, focusing on latency and cost-per-token optimization.
- AI-First Tooling: Lead the team in adopting and optimizing AI-assisted development workflows (Claude Code, Cursor, etc.) to maintain our 10x velocity.
- Strategic Evolution: Collaborate on the long-term technical roadmap, identifying when to use fine-tuned Small Language Models (SLMs) vs. Frontier LLMs.
RequirementsThe "Must-Haves"
- C# Mastery: You are an expert in the modern .NET ecosystem.
- PostgreSQL Expert: You know how to design schemas, optimize queries, and leverage Postgres for high-performance applications.
- Architectural Thinker: You can look at a PoC and know exactly what it needs to survive 100x the current load.
- Blazor: Experience with Blazor (Server or WebAssembly) for building real-time UIs.
- Azure ML: Any exposure to Azure Machine Learning services or deploying ML models into a production pipeline.
- AI Workflow: You already use Claude Code, Cursor, or GitHub Copilot in your daily flow.
Skills Required
- Expertise in modern .NET ecosystem (C#; .NET 10/C# 14)
- PostgreSQL schema design, query optimization, and high-performance usage
- Architectural experience designing systems to scale (e.g., survive 100x load)
- Experience designing and deploying cloud infrastructure for high-concurrency AI workloads (Azure/AWS)
- Productionizing AI workflows, building agentic systems (planning→execution→observation), and implementing evals/guardrails for LLMs
- Experience with Blazor (Server or WebAssembly) for real-time UIs
- Experience with Azure Machine Learning and deploying ML models to production
- Familiarity with AI-assisted development tools (Claude Code, Cursor, GitHub Copilot)
What We Do
Zendbox has built an unrivalled reputation for providing a game-changing fulfilment solution to eCommerce brands. Our mission is to help online businesses simplify their eCommerce operations so they can save costs, maximise their time, and deliver the best fulfilment experiences to their customers. This grants online brands the freedom to focus on what matters most: growing and scaling their business. With our award-winning 3PL service, we take care of the whole fulfilment process for eCommerce businesses, including: 📦 Picking, packing & shipping 🏢 Warehousing & inventory management ↪️ Customer returns management ...and so much more! ----- Here's how Zendbox works: #1: We connect to your eCommerce channels #2: Send your stock to our world-class fulfilment centres #3: Sell to your customers worldwide #4: We pick & pack your orders #5: We dispatch your orders #6: Your customers are delighted! ----- Are you ready to elevate the fulfilment experience for your customers? Get in touch today!
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