About Kin

Kin is a new kind of personal AI companion for whatever life throws at you. It's your safe space to think, plan, and grow with someone who truly understands you. Whether you’re journaling, preparing for conversations, or organizing your thoughts, Kin is here to help you feel confident and clear-headed every day.

At Kin, we believe Personal AI will be the single most valuable asset that everyone will have access to. How it’s designed and built will impact everything, and we are taking a unique approach that fits with the future we want to see.

Our Technology Stack

Kin is built with a local-first and privacy-by-design approach. We believe more AI computation will happen on-device in the future, a trend we're already seeing and are positioned to leverage.

All user data stays on the device, and we utilize edge computing extensively. Our architecture is almost entirely cloud-free, though we partner with trusted LLM inference providers for models we can't yet run locally.

Our architecture consists of:

• A core TypeScript library containing all business logic

• A mobile client built with React Native/Expo

• SQL database (libsql) with embedding support

• On-device inference frameworks (ONNX)

We plan to expand to additional client platforms (desktop, etc.) in the future.

The Role

As a Senior Full-Stack/AI Engineer at Kin, you'll have significant influence on both product and technical evolution. You'll work closely with our engineering team (6 engineers) and collaborate with product leaders, UX researchers, and growth experts.

Key Responsibilities

• Contribute to our AI agent development, innovative memory system, and core Kin capabilities

• Work on both user-facing features and backend/architecture projects

• Help shape our technical direction and product roadmap

• Apply AI technologies to solve real user problems

Requirements

Essential

• Alignment with our values and vision for the future of Personal AI

• Strong computer science foundation, ideally with relevant educational background

• First-principles thinking approach to complex problem-solving

• Experience designing and maintaining scalable architectures in production environments

• Expert-level TypeScript skills and deep familiarity with the JavaScript ecosystem, including React

• 1+ years of experience integrating LLMs into software systems

• Passion for building cutting-edge LLM agent architecture

• Strong understanding of prompt engineering techniques and LLM evaluation

• Comfort with startup environments and their rapid, unpredictable nature

• Ability to thrive in a small team with high autonomy

• End-to-end ownership mindset, from scoping to implementation and continuous improvement

Bonus

• React Native experience

• Experience with different RAG (Retrieval-Augmented Generation) approaches

• Experience with LLM tooling (e.g., LangChain, LangGraph, CrewAI, LlamaIndex)

• Familiarity with prompt management and evaluation tools (e.g., Langfuse, Braintrust)

• On-device ML/AI optimization expertise

• Experience building privacy-focused applications

Our Team

We're a passionate team of experienced founders, proven industry experts, and ambitious talent working on something that truly matters—not just to us but to the world. Our distributed team includes members across Denmark, Poland, Sweden, Germany, the UK, and Portugal.

What We Offer

• Opportunity to work with a passionate, experienced team on meaningful technology

• Competitive startup salary

• Flexible working hours and remote-first culture

• Significant influence on company strategy as an early core employee

• Growth opportunities aligned with your career goals

• Optional office space in Copenhagen with our remote-first approach

If you're excited about shaping the future of Personal AI and this sounds like the right opportunity for you, please apply today!