Senior Fullstack Engineer (AI Focused)

**This is a remote position open to candidates in Europe and Turkey. For those based in the Czech Republic, a hybrid work model is available.

ABOUT US
We are a leading product development partner specializing in custom web and mobile application development. With Silicon Valley founders and top-tier European tech talent, we operate from Prague and have successfully delivered over 65 software products for early-stage startups, scaleups, and global enterprises.
Founded in 2016

Headquartered in Prague

Built and launched 65+ products

90+ team members

Driving product innovation for leading US companies

At OAK’S LAB, we take an AI-first approach, utilizing AI on almost every project. From streamlining design and testing workflows to enhancing developer productivity, our teams leverage tools such as Figma MCP Server, Playwright MCP Server, and Cursor, and we’re actively experimenting with remote AI agents to push the boundaries of what’s possible in product development.

OUR PROJECTS
Here are a few from our portfolio:
Nasdaq Private Market (Series C, Finance)- nasdaqprivatemarket.com

Blackpoint Cyber (Series B, Cybersecurity) - blackpointcyber.com

OpenLoop (Series A, Healthcare) - openloophealth.com

THE ROLE
Our product development team is seeking a Senior Full-Stack Engineer who brings creative thinking, problem-solving, and proactive technical expertise to build outstanding web and mobile applications for our clients. You’ll be working on cutting-edge projects, solving challenges that were previously unsolvable without the use of AI
We are specifically looking for engineers who have hands-on experience building AI-driven solutions and integrating AI models into production applications. This includes practical experience working with LLM APIs, AI-powered workflows, retrieval systems, or other AI integrations that deliver meaningful value to end users.

In this role, you will work within a dedicated product team consisting of the Tech Lead for the specific product, a Product Manager, a Designer, and a skilled team of engineers to drive the product’s success. From engaging in technical discussions to engineering complex features, your involvement spans the entire product development lifecycle.

RESPONSIBILITIES
Design scalable, modular, and maintainable architectures for AI-powered applications

Collaborate with product teams to understand feature requirements and translate them into technical solutions leveraging AI models

Integrate APIs (e.g., LLM APIs (e.g. OpenAI), Hugging Face API) into applications for tasks such as NLP and image recognition

Implement prompt engineering, embeddings, and other techniques to customize model outputs without building models from scratch

Implement vector databases in Postgres for RAG

Use tools like Hugging Face’s Transformers to further customize pre-trained models to suit specific project requirements

Optimize server-side logic to ensure efficient querying and integration with AI tools

Work with unstructured data (text, images, etc.) and convert it into model-ready formats

Validate the output quality from AI models to ensure it aligns with business needs and provides value to end-users

SKILLS & REQUIREMENTS
6+ years in engineering

3+ years of experience in building web solutions using Node.js and React

Experienced with Javascript/Typescript

Hands-on experience building AI-driven solutions and integrating AI models or AI-powered services into production applications

Focus on code quality

Desire to learn new technologies

Strong analytical and problem-solving skills

Proactiveness and the capability to make a difference

Driven, hard work ethic, showing commitment

Ability to work effectively in a team environment, following Agile methodologies

Proficiency in English

TECH STACK
TypeScript

Node.js

React + Next.js

React Native

GraphQL, tRPC

Google Cloud Platform

HuggingFace API, LLM APIs (eg OpenAI API), Langchain

Postgres/Vector Databases for RAG

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