Principal AI Engineer

ButterCMS 🧈

Principal AI Engineer solving high-impact problems across products and internal systems at CKEditor. Focused on software engineering, systems thinking, and AI implementation.

Posted 4/29/2026full-timeRemote • 🇵🇱 PolandLead💰 PLN 38,000 - PLN 45,000 per monthWebsite

Tech Stack

Tools & technologies

JavaScriptNode.jsTypeScript

About the role

Key responsibilities & impact

Solve high-impact problems across product and internal systems, identifying where AI or automation can create real value.
Work closely with engineering, product, and business stakeholders to understand problems, clarify goals, and define the right approach.
Design pragmatic, end-to-end solutions from architecture and technical plans to production-ready systems.
Build systems involving LLMs, integrations, and multi-step or agentic workflows.
Write production-quality code, build prototypes, and evolve them into robust, scalable solutions.
Influence technical direction across teams, define best practices, and help others adopt AI effectively.

Requirements

What you’ll need

8+ years of experience in software engineering.
Strong system design and backend engineering skills.
Experience building and shipping AI / LLM-based solutions.
Ability to move from problem definition → architecture → implementation.
Experience with automation, workflows, or agent-like systems.
Hands-on approach and willingness to write production code.
Strong engineering judgment (including knowing when not to use AI).
Fluency in Polish and English (minimum C1 level).
Experience working across teams and influencing technical decisions.
Curiosity, ownership, and interest in applying AI in practice.
Nice to have: Experience with TypeScript and Node.js (our primary stack), or willingness to work extensively in this environment.
Experience with AI in developer tooling or internal systems.
Familiarity with agentic systems or orchestration frameworks.
Experience with production systems (performance, reliability, scalability).

Benefits

Comp & perks

B2B contract-based monthly remuneration is 38.000 - 45.000 PLN + VAT or its equivalent on the employment contract.
Flexible schedule and the possibility to work fully remotely.
Professional development resources (up to 5 days of additional leave and 6 000 PLN yearly).
LinkedIn Learning access.
Extra leave for Tiugo Day - our company’s foundation day and your birthday.
English lessons with a native speaker and an online language platform where you can learn English, Spanish, and German.
Access to a mental health and well-being platform with 24/7 dedicated psychological support.
Private medical care (Enel Med or Medicover) and Multisport card.
2 weeks of paid parental leave for our contractors.

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

software engineeringsystem designbackend engineeringAI solutionsLLM-based solutionsautomationworkflowsproduction codeTypeScriptNode.js

Soft Skills

engineering judgmentcuriosityownershipinfluencing technical decisionscollaborationproblem definitioncommunication