Fullstack AI Engineer

About air Slate

air Slate is a global SaaS technology company that develops no-code workflow automation, electronic signature, and document management solutions. Our award-winning products - Sign Now, pdf Filler, Doc Hub, alta

Flow, Instapage, and US Legal Forms - serve over hundreds of millions of users and more than one million customers worldwide, helping organizations of every size digitize processes, improve efficiency, and transform how they work.

We’re in an exciting phase of growth and transformation, with teammates in more than 20 countries across three continents and main hubs in the United States, Poland, Romania, Ukraine, and Philippines
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At air Slate, we’re building value for customers and a culture where growth and innovation go hand in hand. We’re looking for people eager to shape products, scale a company, and thrive in a fast-moving environment.

Doc Hub

We are a small but ambitious team of 20+ technologists on a mission to succeed with our Google-integrated PDF editor and Signature solution – Doc Hub.

Doc Hub streamlines document editing, signing, distribution and forms completion to get your documents done. Offering a deep integration with Google Workspace, Doc Hub allows users to import, export, modify, and sign documents directly from Google apps to ensure smooth business processes and interactive workflows.

Doc Hub has several million monthly active users and is highly rated in the Google Workspace Marketplace. We are building new features and functionality to target larger customers and will deploy generative AI features this year. Our team has several senior engineers who have worked at Doc Hub for many years and have a deep understanding of the technology stack. We make decisions quickly and are always searching for ways to streamline our customers' workflows.

And now, we are looking for a Fullstack AI Engineer who is prepared to contribute to the next chapter of our company's growth.

• Fullstack Development: Build, maintain, and optimize scalable backend features using Ruby on Rails and front-end interfaces for AI integrations using Type Script.
• API Integration: Connect and manage integrations with major LLM providers (OpenAI, Open Router).
• AI Agent Orchestration: Implement and manage multi-step, autonomous AI workflows.
• RAG Implementation: Combine retrieval mechanisms with generative models to improve information accuracy and relevance.
• Prompt Engineering: Craft and refine prompts to optimize AI responses and outputs.
• Model Optimization: Opportunity to customize pre-trained models and optimize LLM inference as needed.

• 4+ years of professional experience with Ruby on Rails.
• Proficiency with Type Script.
• Experience building agentic flows and working with LLM APIs.
• Proficiency with SQL.
• Experience with vector databases (e.g., Pinecone, Milvus, pgvector) is a major plus.
• Experience with modern frontend development.
• Familiarity with testing tools and frameworks.
• Ability to evaluate various technical approaches and methodologies to ensure the delivery of optimal, high-quality results.
• Excellent communication skills, with a focus on proactive status reporting and ensuring alignment through active listening and clarifying requirements.

Flexible working environment – Our teams operate across the globe. We value in‑person collaboration in our hubs, but we also embrace remote and hybrid working. You can work from one of our offices in the United States, Poland, Romania or Ukraine, or remotely from many countries.

Competitive compensation and stock options – We offer salaries that reflect local market conditions and experience, plus a performance-based bonus system and stock options so you share in the company’s growth.

Professional growth and learning – We invest in your development through courses, conferences, and access to learning resources. We encourage career growth and internal mobility, supporting teammates who want to explore new opportunities within air Slate.

Health and well‑being – We provide comprehensive benefits tailored to each country, including health coverage, wellness programmes and access to fitness options. We also dedicate…