Principal Applied 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. A significant part of this role is improving how software is built inside the company. You will design and implement agentic workflows and AI-assisted development systems that enhance how engineers write, review, test, and operate software. You are expected to use AI as part of your own daily engineering workflow - not just build AI systems for others. 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. • Make sound engineering decisions across model choice, orchestration, evaluation, latency, cost, reliability, security, and maintainability. • 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 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. • 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.