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Senior Software Engineer (Rails/LLMs) at TimeZest. Location Information: Anywhere in the World. . . Headquarters:. Remote . URL:. . https://timezest.com. . . . . Company. . . . . TimeZest. makes it easy for end users to schedule appointments with IT service providers. Since launching in 2019, . TimeZest. has grown rapidly and is now a critical piece of software used by over 1,000 businesses.. . . . . We’ve. been a remote-only company from day one, with 22 great people spread across Europe, Asia, and the United States. We . maintain. a relaxed working environment, using just enough process to stay efficient. . We’re. bootstrapped, profitable, and focused on building software our customers love.. . . . . Role overview. . . . . As we expand into AI-powered features, . we’re. hiring a . Senior Software Engineer. to lead our integration of . large language models (LLMs). into our platform. . You’ll. design and build the core backend systems that power intelligent ticket categorization, document indexing, vector search, and prompt orchestration—while helping upskill the rest of the team in this emerging space.. . . . . You’ll. bring both strong . Rails experience. and . LLM . expertise. , helping us build a scalable, production-grade foundation for new AI-driven capabilities.. . . . . What . you’ll. do. . . . . . . Design and build. scalable backend services for LLM workflows—vector embedding, retrieval pipelines, and LLM API integration. . . . . . . . . Build data pipelines. to process, index, and embed ticket content, documents, and structured data. . . . . . . . . Lead architecture. decisions related to LLM orchestration, prompt engineering, context management, and API reliability. . . . . . . . . Collaborate cross-functionally. with product, engineering, and design to take ideas from prototype to production. . . . . . . . . Drive backend best practices. —including code quality, test coverage, observability, and performance. . . . . . . . . Mentor and guide. junior and mid-level engineers through code reviews, system design sessions, and hands-on pairing. . . . . . . What . we’re. looking for. . . . . . . 7+ years. of professional software development, including . 5+ years. in backend roles. . . . . . . . . 3+ years of recent production experience with . Ruby on Rails. . . . . . . . . Strong knowledge of relational databases (PostgreSQL), data . modelling. , indexing, caching, and performance tuning. . . . . . . . . Track record. of designing secure, scalable, observable backend systems and architectures. . . . . . . . . Hands-on experience integrating . LLM APIs. (e.g., OpenAI, Anthropic) into production software. Bonus if within Rails applications.. . . . . . . . . . . Excellent system-design skills for search & retrieval workloads, scalable services, and robust data pipelines. . . . . . . . . Excellent communication skills and the ability to mentor others in a collaborative, fully remote team. . . . . . . Our Stack. . . . . Ruby on Rails 7, PostgreSQL, . Sidekiq. , TypeScript and React, all running on Heroku.. . . . . Nice to Have. . . . . . . Frontend experience with . TypeScript & React. . . . . . . . . Previous. experience with AI/ML-focused data pipelines in other environments and languages. . . . . . . . . Experience deploying or self-hosting open-source LLMs (e.g., Mistral, . LLaMA. ) using modern inference frameworks. . . . . . . . . Previous. experience working in a remote role.. . . . . . . What we offer. . . . . . . Competitive salary with equity options. . . . . . . . . Full remote role. , open worldwide providing there is some overlap with engineering team. . . . . . . . . New company issued machine. . . . . . . . . Annual company and team trips to gather and get to know each other better. . . . . . . . . Flexible hours, home-office stipend, annual learning allowance. . . . . . . . . Full licences to your favourite coding agent tool (Cursor, Copilot etc). . . . . . . This is a permanent, full-time position with a salary paid monthly. It is a remote position, and you can be based anywhere in the world, . if. you have 2-3 hours of overlap with the engineering team.. . . . . We’re. looking forward to hearing from you!. . . . . To apply:. . https://weworkremotely.com/remote-jobs/timezest-senior-software-engineer-rails-llms.