Principal AI Engineer
We are the company behind CKEditor - an open-source rich text editor used by millions of people around the world. We are part of Tiugo Technologies, a family of API-first developer platforms (CKEditor, TinyMCE, ButterCMS, Uploadcare) focused on content creation and digital collaboration.
Your role:
We're looking for a Principal Applied AI Engineer to solve high-impact problems across our products and internal systems using a pragmatic combination of software engineering, systems thinking, and AI.
You will work across CKEditor AI & Cloud Services, internal tools, and cross-functional initiatives, identifying where AI or automation can create real value, shaping the solution, and building it end to end.
This role is for a senior hands-on engineer who is comfortable operating in ambiguity, moving from problem definition to architecture to implementation, and influencing how other teams adopt AI effectively.
Key Responsibilities:
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.
To be successful in this role you need the following:
8+ years of experience insoftware 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.
Fluency in Polish and English (minimum C1 level).
Strong engineering judgment (including knowing when not to use AI).
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).
Why join CKSource:
Our people are a huge part of what makes CKSource a great place to work! Aside from a great team, some of our benefits include:
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.
Recruitment process
HR interview.
Technical interview with Senior Director of Engineering.
Paid task - a practical assignment reflecting real challenges you may encounter in this role.
Solution review discussion - a conversation about your approach, decisions, and trade-offs in the task.