ButterCMS builds a headless content management system for developers and marketing teams. Its API and dashboard let teams manage content across websites, ecommerce sites, and mobile apps, while developers use its tools and starter projects to build with different technology stacks. The platform includes a media library, integrations, multi-site management, AI-assisted content creation, and migration tools. ButterCMS works in the SaaS, marketing, and consulting sectors.
Senior Staff AI Systems Software Engineer
Lead the architecture and delivery of backend systems for CKEditor AI, CKSource’s open-source rich text editor. Build dependable LLM integrations and scalable AI features for production.
Polandzł 32,000 – zł 40,000 / month
RemoteFull-timeSeniorEnglish RequiredAI EngineerMachine Learning EngineerDescription
- Set the architecture and technical direction for AI systems from early exploration through production.
- Design scalable, maintainable systems, guiding decisions on APIs, service boundaries, reliability, performance, security, and cost.
- Translate complex product ideas into experiments, prototypes, and production-ready solutions.
- Build dependable LLM integrations and establish ways to test, evaluate, monitor, and improve AI features.
- Write and review code while solving complex technical problems.
- Coach and support engineers.
- Shape engineering practices and help teams use AI development tools while maintaining code quality and maintainability.
Requirements
- Demonstrated experience designing and delivering complex production systems at Staff, Senior Staff, Tech Lead, or equivalent level.
- Strong practical experience with TypeScript, Node.js, software architecture, and distributed systems.
- Experience delivering production AI or LLM features, including testing, evaluation, observability, and reliability.
- Sound architectural judgment and the ability to balance simplicity, scalability, and long-term maintainability.
- Ability to own work end to end, from ambiguous technical challenges through successful production delivery.
- Ability to shape technical decisions, mentor engineers, and work effectively across teams without formal authority.
- Preferred: Experience with multi-provider LLM integrations, AI evaluation frameworks, tracing, or experimentation.
- Preferred: Experience with AWS, infrastructure as code, and event-driven architectures.
- Preferred: Experience building developer platforms, APIs, SDKs, or open-source products.
- Preferred: Experience creating shared libraries, frameworks, or internal platforms.
Benefits
- Flexible working hours and the option to work fully remotely.
- Professional development support, including up to five additional leave days and 6,000 PLN per year.
- Access to LinkedIn Learning.
- Additional leave for Tiugo Day and your birthday.
- English lessons with a native speaker.
- Online platform for learning English, Spanish, and German.
- Mental health and wellness platform with dedicated psychological support available 24/7.
- Private medical care through Enel Med, PZU, or Medicover.
- Multisport card.
- Two weeks of paid parental leave for contractors.