Senior AI Engineer

Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure.

Senior AI Engineer

Must have ability to be onsite in Boulder, CO office for 2-3 days a week

Colt Technology Services is a global digital infrastructure company, operating one of the world's largest fibre networks across Europe and Asia. We are building a Boulder-based AI team as the engineering centre of our AI Practice. The team is responsible for how AI is adopted, governed, and scaled across Colt. The AI Practice operates across several parallel work streams, including use case delivery, AI WAN, and private AI.

The Boulder team is where we build, test, and validate before we scale.

This is a build role. You will take AI use cases from a business problem to something running in production and being used every day: retrieval and search over Colt's own data, agents that carry out multi-step work, and AI built into the systems Colt's teams already rely on. We are looking for a strong software engineer first. If you have spent eight to ten years building and running production systems and even if you have not yet shipped an LLM-based product, we want to hear from.

The platform, the tooling, and the model access are already in place, and a staff-level AI engineer on the team will pair with you directly on the AI side of the work. The AI-specific skills you can bring to the table is a plus but is also learnable. The engineering experience and judgement that comes from having owned real systems in production is not, and that is the part we are hiring for.

What we do expect is that you have already got hands on with AI, whether at work or as a side project for yourself. You will be working directly with the Colt teams taking requirements from them. The team is small by design, the problems are real, and what you build in your first year sets the pattern for how Colt builds AI.

• Build AI Use Cases
• Design and build AI applications end to end: data access, retrieval, model calls, orchestration, and the interfaces people use
• Work with large language models through APIs and self-hosted inference, covering prompting, tool use, retrieval, and multi-step agent workflows
• Build evaluation harnesses that show whether a use case is good enough to ship, and keep owning them after it ships
• Integrate AI into Colt's existing systems and data, within the constraints of a live enterprise environment
• Work Directly With the Business:
  Work with the Colt teams, who will be your customers, and who will use what you build, across network operations, service delivery, finance, and others
• Turn a loosely described business problem into a scoped, buildable design
• Show working software early and often, and change direction when the first answer turns out to be wrong
• Be straight with stakeholders about what AI is not the right tool for
• Take It to Production and Keep It There:
  Move your own work from prototype to production-grade: tested, instrumented, documented, and supportable
• Monitor accuracy, latency, and cost in production, and act when they drift
• Work with platform engineers on deployment, and hand over cleanly to production operations
• Contribute reusable patterns, components, and internal libraries so the next use case is faster than the last

Engineering

Experience:

8-10+ years building production software. You have owned systems end to end: designed them, shipped them, operated them, and been on the hook when they broke.

Languages:

Strong in Python, or strong in another language such as Java, Go, C#, or Type Script and…