Senior Backend Engineer (AI)

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.

• Over 5 years of software development experience.
• Strong proficiency in TypeScript and Node.js.
• Experience building and maintaining backend services - REST APIs, relational databases (PostgreSQL), message queues, Docker.
• Fluency in Polish (minimum C1) and good command of English (minimum B2).
• Excellent problem-solving skills and the ability to think critically and creatively.
• Outstanding communication skills, both verbal and written.

Nice to have:

• Experience integrating third-party APIs (LLM providers, external services).
• Understanding of AI/LLM concepts - prompt engineering, function/tool calling, streaming.
• Experience with cloud infrastructure (AWS - SQS/SNS, S3, ECR).
• Familiarity with observability tools (OpenTelemetry, tracing).
• Curiosity about AI and willingness to learn how LLMs work.
• Experience with event-driven architectures and real-time data processing (streaming, WebSockets, or similar).

• Design, build, and maintain backend services for CKEditor 5 - including REST APIs, real-time streaming, event-driven processing, and data persistence.
• Build and maintain a multi-service architecture with message queues, caching, and async communication patterns.
• Engage in code reviews, pair programming, and cross-functional collaboration to ensure the highest quality results.
• Write clean, maintainable, and well-structured code, balancing readability with appropriate documentation.
• Share best practices on programming standards, tools, and processes to foster continuous improvement.