CoreTeam.io

CoreTeam.io builds engineering teams for startups working on GenAI and deep-tech products, from Serbia and Bulgaria. Every engagement opens with a senior lead engineer shipping work from the first day, and the group later expands to suit the founder's product and culture, with the client keeping ownership of the result.

A lead engineer who ships from day one

The firm's model begins with a senior engineer who writes and ships code while the rest of the team is being hired. The company says delivery starts on day one rather than after the full team has been assembled.

Dedicated teams that work on one product

The engineers CoreTeam.io places work only on one client's product, rather than sharing their time across several. The site says the product and its roadmap belong to the founder, and the team is built to serve them.

GenAI engineering and model work

For GenAI startups the firm builds AI infrastructure, features that rely on large language models, and the work of training and tuning models. It also coaches teams to build with AI, not only to build AI systems for their own sake. The company describes the engineers it hires as trained to scale GenAI systems, from high-throughput infrastructure to practical LLM-powered features.

Full-stack, DevOps and performance work

The engineering teams work across the front end, back end and DevOps, with Python, Node, React, Vue and Java among the languages they use. The firm also takes on performance and scaling problems, fixing bottlenecks in infrastructure and in the code that runs across the stack.

Hiring, culture and cost

CoreTeam.io says it hires the top three per cent of engineers and matches candidates on mindset and mission as well as skill. Its site headlines the claim of half the cost and double the retention, which it presents as the reason founders use the model. The firm says the team is built to suit the founder's culture, and that each client's engineering core is owned by that client.

Its clients are GenAI and deep-tech startups and the founders behind them, and it describes the arrangement as a partnership in which the founder sets the roadmap and the engineers deliver against it.