---
title: 'Principal AI Engineer at nexos.ai'
canonical: 'https://feeny.ai/job/principal-ai-engineer-nexos-ai-vilnius-6zcb04kkcd66'
type: 'job'
last_seen: '2026-09-13'
---

# Principal AI Engineer at nexos.ai

- **Company:** nexos.ai
- **Location:** Vilnius, Lithuania
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-07-20
- **Last confirmed live:** 2026-09-13
- **Apply:** https://jobs.ashbyhq.com/nexos-ai/f22f30fd-943c-4803-8671-928723eb35cf

## Job description

Own the AI revolution. We're building an all-in-one AI platform to help teams do their best work and automate every routine task you can think of. We're looking for someone who operates at the highest technical level - equally at home prototyping a new idea on Monday and shaping our AI roadmap on Friday. If you want to do serious work and have real influence over where it goes, this is the role. Main Responsibilities

- Shape the AI/ML technical direction - contribute to research strategy, validate POCs hands-on, and bring the architectural perspective that influences how we build
- Be the GenAI authority - stay ahead of the field, decide what's signal versus noise, and bring the team with you
- Lead hands-on exploration of new concepts, frameworks, and tooling - context management, memory, retrieval, agentic loop, A2A and beyond - from experimentation all the way to production
- Be a core part of product development - from discovery with PMs to delivery within cross-functional teams, operating as both a doer and a thought leader in the same sprint
- Own the LLM evaluation framework (proprietary and OSS) - set the criteria, run the assessments, make the call on performance, cost, and reliability
- Act as AI evangelist internally and externally - at this level, spreading serious AI thinking is part of the job, not a bonus

Core Requirements

- Proven track record of driving AI/ML initiatives end-to-end in production - you've owned the outcome, not just the ticket
- Expert ability to design, execute, and scale production-grade AI systems - and the hands-on instinct to still get in and build
- Deep command of AI developer frameworks and tooling - with the judgment to make the right call, not just the popular one
- Expert understanding of large language models, embeddings, multimodality, and AI architectures - including where they break
- Advanced expertise in context engineering and deployed evaluations - you raise the bar for how the team thinks about this
- Strong ownership and accountability - you can plan your own work, influence the team's direction, and still ship
- A builder's instinct: moves fast when it matters, rigorous when it counts
- Solid software engineering fundamentals, microservice architectures, and experience taking POCs through to production

Bonus Points For

- Architect-level experience designing and shipping complex Agentic systems at scale
- Deep expertise in data science methodologies, ML algorithms, and NLP - the fundamentals, not just the wrappers
- Experience in backend engineering, API design, scalable systems, and Kubernetes
- Track record of owning features end-to-end and working fluidly across engineering, product, sales, and marketing

Salary Ranges

- Gross salary from 6600 EUR/Month (final compensation depends on exact experience)

## What We Offer

- Professional growth. Internal and external events, online training, conferences, books - everything you need to reach your full potential.
- Health benefits. Private health insurance, online & on-site workouts (LT) / online workouts & sports access card (PL), consultations - to feel and be your best.
- Team spirit. Team buildings and parties with games, shows, tastings, food coupons, gifts - and it's on us.
- More free time. Stay with us and additional vacation days will be added to your calendar.
- Additional paid leave. Additional days are covered by us in cases of illness or special occasions.
- Flexibility. Flexible working time arrangement.

## About nexos.ai

## Company Overview
- **One-liner**: nexos.ai is an all-in-one AI platform that enables enterprises to build custom, no-code AI Agents and automate complex Workflows from a single, unified interface.
- **Entity Type**: Private (Series A)
- **Headquarters**: Vilnius, Lithuania
- **Founded**: 2024
- **Founders**: Tomas Okmanas (Co-founder, CEO) and Emanuelis Norbutas (Co-founder, CTO)

## Core Business
- **Primary industry**: Enterprise AI platform (Technology, Information and Internet)
- **Target customers**: B2B, mid-market to enterprise teams (marketing, sales, legal, finance, HR, engineering)
- **Mission or purpose**: “Unlock the full potential of AI” by providing a secure, model-agnostic platform that lets businesses run AI with confidence.

## Products & Services
- **nexos.ai Platform**: A unified interface offering:
  - **Multi-model chat** – Access ChatGPT, Claude, Gemini, Mistral, and hundreds of other models in one place with real-time web search and instant model switching.
  - **No-code AI Agents** – Build custom agents without coding; define roles, scope, and connect to company data.
  - **Workflow Automation** – Automate complex workflows with no-code triggers and actions.
  - **Integrations** – Connect to Google Workspace, SharePoint, Slack, GitHub, Zendesk, Confluence, and more (zero-code).
  - **Security & Compliance** – SOC 2 Type 2, ISO 27001 certified, GDPR-compliant, with private model hosting and European data residency.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total funding of **$43.2M** (Seed $8M in Jan 2025, Series A $35.2M in Oct 2025)
- **Notable Investors/Partners**: Index Ventures (led both rounds), Evantic Capital (co-lead Series A)
- **Growth Signals**: Headcount grew **274.2% YoY** to 97 employees; operates in 9 countries (Lithuania, Poland, UK, Canada, Netherlands, Israel, etc.); 13 open roles as of mid-2026.

## Competitive Advantages
- **Data privacy by design**: Promises never to train AI models on customer data, with zero data retention option at the LLM level.
- **Enterprise-grade security**: SOC 2 Type 2, ISO 27001, GDPR-compliant, SSO, RBAC, and full audit logging.
- **Model-agnostic flexibility**: Lets customers use any LLM (OpenAI, Anthropic, Google, Mistral, Meta) and even bring their own API keys.
- **European hosting**: Infrastructure and most models hosted in Europe, meeting strict regulatory requirements.
- **No-code approach**: Lowers barrier for non-technical teams to build AI agents and automations.

## Strategic Focus
- **Enterprise adoption**: Building guardrails and observability tools so organizations can safely deploy AI across departments.
- **Security & compliance leadership**: Emphasizing certifications and data sovereignty to win regulated industries.
- **Platform expansion**: Growing integrations, pre-built agent templates, and workflow capabilities to replace point solutions.

## Why Work Here
- **Culture**: “Strong community” with beer Fridays, quarterly OKR parties, team-buildings, and workations; “not a dull moment.”
- **Work policy**: Hybrid – 3 days in-office (Vilnius or Poland), 2 days remote; some roles fully remote; digital nomad periods possible.
- **Perks**: Private health insurance, 25 free psychotherapy sessions, premium mental health app (Calm/Headspace/Mindletic), on-site gym & classes, learning budget (courses, conferences, library), extra vacation days for loyalty and life events.
- **Engineering culture**: “Innovate with industry experts”; technical tasks in hiring process; emphasis on Go, AI engineering, and product design.

## Sources
1. [nexos.ai](https://nexos.ai/)
2. [nexos.ai Careers](https://nexos.ai/careers/)
3. [LinkedIn](https://lt.linkedin.com/company/nexos-ai)

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- [Product Designer | Senior](https://feeny.ai/job/product-designer-senior-nexos-ai-kaunas-py34jh0pzdy2) — Kaunas, Lithuania
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