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.

SummaryJob title: Senior AI Engineer

Reports to: VP of AI Technology and Architecture

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

About Colt and the AI Practice

Colt Technology Services is a global digital infrastructure company, operating one of the world's largest fiber networks across Europe and Asia. We are building a Boulder-based AI team as the engineering center 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 workstreams, including use case delivery, AI WAN, and private AI. The Boulder team is where we build, test, and validate before we scale.

Why we need this role

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.

What you will doBuild 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