> Markdown version of [/jobs/ext/1376053-principal-software-engineer](https://www.wearedevelopers.com/jobs/ext/1376053-principal-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Software Engineer - **Company:** Epicor - **Location:** Peterborough, UK - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), .NET Framework, Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Microsoft Azure, Business Software, C Sharp (Programming Language), Databases, Github, Python (Programming Language), Cloud Services, Data Streaming, Systems Integration, TypeScript, Management of Software Versions, Enterprise Software Applications, Large Language Models, Backend, Data Layers, Epicor ERP, Graphql, Front End Software Development, Api Design - **Published:** July 22, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=c488604785620365 ## About the Role * Principal-level engineering depth in C#/.NET and/or Python, with cloud platforms (Azure preferred), and a strong record of designing and shipping production services. Our systems span both stacks - strength in one with working fluency in the other is the expectation. * Production TypeScript/JavaScript frontend engineering experience, including building secure, accessible user interfaces that integrate with enterprise web shells, APIs and backend services. * Experience designing and integrating enterprise information systems, with a strong understanding of data flows, system boundaries and the operational impact of change. * Ability to work effectively with data scientists and other AI specialists to turn data, models and experimentation into reliable, usable product capabilities. * Production ownership experience - you have run systems in production and carry the instincts that come from it: partial failure, resilience, blast-radius thinking, and designing for the incident nobody planned. This matters to us more than any specific framework. * Distributed-systems fluency: service boundaries, transactional thinking, multi-tenant design, API design and versioning. * Strong architectural communication - able to explain, document, and defend design decisions across teams, and to review others' designs constructively. * Pragmatism under real-world constraints: comfortable integrating with large, long-lived enterprise systems and choosing the achievable-good over the theoretical-perfect. Highly desirable: * Hands-on exposure to AI-assisted engineering - building with LLM APIs, agentic coding tools, and prompt-driven workflows, and a grounded view of where they help and where they don't. * Experience taking early-stage products (PoC/MVP) to production, ideally in enterprise software. * AWS experience. * Complex business-domain experience - ERP, e-commerce, finance, logistics - and an appreciation of the cost of getting business data wrong. * Security instincts: least privilege, tenancy isolation, trust boundaries. ## Description As a Principal Engineer, you'll play a key role in designing and delivering the next generation of AI capabilities across Epicor's ERP portfolio. * PoCs and MVPs in AI transformation projects inside enterprise ERP software - rapid exploration of new capabilities, with the engineering discipline to evolve the successful ones into production-grade services. * Cloud platform services - designing and building the services, APIs, and data layers that new AI capabilities run on, integrating with large, established ERP products. * Production readiness - bringing R&D output up to enterprise standard: reliability, observability, security, multi-tenancy, and safe failure behaviour. * AI engineering - integrating LLMs and agentic patterns into business software responsibly: guardrails, permissions, auditability, and designing for the probabilistic nature of AI components acting on real business data. * Raising the bar - architectural review across the team's workstreams, mentoring engineers at all levels, and turning good judgement into standards and automation rather than tribal knowledge., * Own components from design through implementation * Contribute architectural improvements across the team Within 6-12 months, you'll: * Lead the design of major platform capabilities * Become a trusted technical leader and architectural reference point * Mentor engineers and help raise engineering standards across Epicor Labs About Epicor Labs: Epicor Labs is the innovation engine behind AI transformation across Epicor's ERP portfolio. Our team explores new ideas, rapidly prototypes solutions, and turns successful concepts into production-ready capabilities before handing them over to product engineering teams. We're a small, senior team with: * High autonomy * Minimal bureaucracy * Fast decision-making * Strong engineering standards * A collaborative culture where the best ideas win, regardless of title You'll work alongside experienced architects, product managers, UX designers, and AI specialists to solve challenging technical problems with real customer impact. Technology: * C# / .NET * Python * Azure * TypeScript / JavaScript * REST & GraphQL APIs * Relational & document databases * GitHub with CI/CD pipelines * LLM APIs * AI-assisted development tools #LI-AJ1 ## Related Videos - [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next) - [Putting the Graph In GraphQL With The Neo4j GraphQL Library](https://www.wearedevelopers.com/videos/257-putting-the-graph-in-graphql-with-the-neo4j-graphql-library) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Navigating the Corporate Jungle: Life as a Developer in a large Company](https://www.wearedevelopers.com/videos/621-navigating-the-corporate-jungle-life-as-a-developer-in-a-large-company) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Bringing AI Model Testing and Prompt Management to Your Codebase with GitHub Models](https://www.wearedevelopers.com/videos/1536-bringing-ai-model-testing-and-prompt-management-to-your-codebase-with-github-models) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [The Best X (Twitter) Accounts for Developers](https://www.wearedevelopers.com/magazine/294-the-best-x-twitter-accounts-for-developers) - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)