Remote Senior Software Engineer (Rails/LLMs) at TimeZest

Company

We’ve been a remote-only company from day one, with 25 great people spread across Europe, Asia, and the United States. We maintain a thoughtful 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 drive the backend work needed to introduce these new capabilities into our product.

You’ll design and build the core services behind intelligent workflows (e.g., ticket categorization, document indexing, retrieval/search, prompt orchestration) and help turn prototypes into production systems

We’re looking for a strong Rails backend engineer who’s fearless about diving into new domains, running experiments, and learning quickly.

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

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
Some frontend experience with TypeScript & React
Track record of designing secure, scalable, observable backend systems and architectures
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

Experience integrating LLM APIs (e.g., OpenAI, Anthropic) into production software
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

What we offer

Competitive salary with equity options
Full remote role
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 at least 3 hours of overlap with Central European Standard Time.

We’re looking forward to hearing from you!