Spectrum collects data from an organization’s code, docs, and issues, and organizes knowledge in a unified ontology that AI agents can efficiently search through and reason over. We aim to revolutionize the semantic layer space for software-building organizations and move beyond specs that fall out of sync with code, introducing a living spec – one that’s extracted from the whole system and used to keep it aligned. Spectrum is meant to be the single source of truth for all product and architectural knowledge.
Overview
Spectrum is a resident of JetBrains' startup incubator, with startup speed and autonomy, and backed by 25 years of developer tooling expertise. We are looking for a top-class ML Engineer who will help us shape the future of software development. You will own our AI and ML engineering stack and help define the research agenda for our team. Your technical vision and design decisions will directly shape the product and determine its success.
Responsibilities

Designing and building the ML/LLM solution for data ingestion, knowledge extraction, retrieval,



and subsequent reasoning.
Creating the datasets, metrics, and pipelines that drive measurable improvements across the system.
Architecting and improving agents for context retrieval, knowledge extraction, and data alignment, which includes prompt engineering, model selection, and inference optimization.
Establishing MLOps practices, including orchestration, observability, and experiment tracking.
Collaborating with the engineering team on system design and with JetBrains Research on the research agenda.
Defining hiring criteria, growing the ML team, and shaping the ML team culture.

Qualifications

A proven track record as an ML/AI Lead.
At least five years of experience in ML/AI systems, with at least two years focused on LLMs and generative AI.
A deep understanding of the LLM ecosystem, including model architectures and fine-tuning approaches.
Hands-on experience with:

Prompt engineering and LLM pipelin

📌 Founding ML Engineer (Madrid)
🏢 JetBrains
📍 Madrid