Senior Software Engineer (Rails/LLMs)
Anywhere
a day agoAbout the 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.
About the job
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
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Design and build scalable backend services for LLM workflows—vector embedding, retrieval pipelines, and LLM API integration
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Build data pipelines to process, index, and embed ticket content, documents, and structured data
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Lead architecture decisions related to LLM orchestration, prompt engineering, context management, and API reliability
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Collaborate cross-functionally with product, engineering, and design to take ideas from prototype to production
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Drive backend best practices—including code quality, test coverage, observability, and performance
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Mentor and guide junior and mid-level engineers through code reviews, system design sessions, and hands-on pairing
What we’re looking for
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7+ years of professional software development, including 5+ years in backend roles
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3+ years of recent production experience with Ruby on Rails
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Strong knowledge of relational databases (PostgreSQL), data modelling, indexing, caching, and performance tuning
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Track record of designing secure, scalable, observable backend systems and architectures
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Hands-on experience integrating LLM APIs (e.g., OpenAI, Anthropic) into production software. Bonus if within Rails applications.
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Excellent system-design skills for search & retrieval workloads, scalable services, and robust data pipelines
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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
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Frontend experience with TypeScript & React
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Previous experience with AI/ML-focused data pipelines in other environments and languages
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Experience deploying or self-hosting open-source LLMs (e.g., Mistral, LLaMA) using modern inference frameworks
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Previous experience working in a remote role.
What we offer
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Competitive salary with equity options
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Full remote role, open worldwide providing there is some overlap with engineering team
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New company issued machine
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Annual company and team trips to gather and get to know each other better
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Flexible hours, home-office stipend, annual learning allowance
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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!
