Staff / Senior Staff Software Engineer – AI Systems
This is the employer's own posting, not a copy on a job board.
What we know
Is it still open?
Confirmed still open
Last checked 5h ago — checked against the employer's own applicant tracking system, which is the company answering directly.
We re-read the employer's own applicant tracking system and the posting was still there. That is the company answering directly.
How old is it?
Posted 6h ago
The date the source published, not the day we noticed it (2026-10-14). Last seen at its source 1h ago.
Is it remote?
Marked remote on the employer's board
Their board carries a remote setting on this posting — a field they filled in, not wording we read. The location field names somewhere specific, which is usually where the team or the entity sits.
Who may apply?
Poland
The description states no restriction of its own. This is the source's own tag.
Pay not stated
Similar roles pay PLN 302.4k–399.8k/yr
Middle 50% of 34 listings that do state pay — Engineering · Senior · Poland · PLN/year. This employer has published no salary; this is what comparable listings we hold disclose, never converted between currencies or periods. How this is calculated.
Skills named in the ad
Recognised terms only, from a fixed vocabulary — this is what CV matching compares against.
Carried by 1 source
-
Recruitee employer's own board first seen 5h ago · last seen 1h ago
The listing
CKSource builds CKEditor, an open-source rich text editor used by millions worldwide. We're part of Tiugo Technologies, alongside TinyMCE, ButterCMS, and Uploadcare.
Your role:
We're looking for a hands-on Staff / Senior Staff Software Engineer to drive the architecture and technical direction of backend of AI-powered systems in CKEditor.
CKEditor AI is already in production, with features like AI Chat, Quick Actions, and Review. We're expanding our AI platform, integrating LLMs, contextual data, APIs, and external systems.
This is an individual contributor role, not an ML research or people-management position. You'll combine strong software engineering fundamentals with the challenges of building reliable, scalable AI-powered products.
Key Responsibilities:
Lead the architecture and technical direction of AI-powered systems, from early exploration to production and beyond.
Design scalable, maintainable systems, making sound decisions about APIs, service boundaries, reliability, performance, security, and cost.
Turn complex product ideas into experiments, prototypes, and production-ready solutions.
Build reliable LLM integrations and establish practices for testing, evaluation, monitoring, and improving AI features.
Stay hands-on by writing and reviewing code, solving complex technical challenges, and mentoring engineers.
Influence engineering practices and help teams adopt AI development tools without compromising code quality or maintainability.
To be successful in this role you need the following:
Proven experience designing and delivering complex production systems at Staff, Senior Staff, Tech Lead, or equivalent level.
Strong hands-on experience with TypeScript, Node.js, software architecture, and distributed systems.
Experience building LLM- or AI-powered features in production, including testing, evaluation, observability, and reliability.
Strong architectural judgment and the ability to balance simplicity, scalability, and long-term maintainability.
End-to-end ownership, from ambiguous technical challenges to successful production delivery.
Ability to influence technical decisions, mentor engineers, and collaborate effectively across teams without formal authority.
Nice to have:
Multi-provider LLM integrations, AI evaluation frameworks, tracing, or experimentation.
AWS, infrastructure as code, and event-driven architectures.
Experience building developer platforms, APIs, SDKs, or open-source products.
Experience creating shared libraries, frameworks, or internal platforms.
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 32.000 - 40.000 PLN + VAT (or its equivalent on the employment contract) - the final level and compensation will depend on your experience, technical expertise, and the scope of your previous responsibilities.
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, PZU or Medicover) and Multisport card.
2 weeks of paid parental leave for our contractors.