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

Important Notice: OAK'S LAB communication, including interview requests and job offers, are only sent from an "@oakslab.com" or "@oaks-lab.com" email addresses (e.g., [email protected] or [email protected]). Any message from a different email domain is not associated with OAK'S LAB. We will never ask for payment information or banking details via email, phone, or any other communication channel during the interview process. If you receive messages using our name, domain, or brand assets in an attempt to impersonate us or act on our behalf, do not engage. Instead, report it to Econsumer.gov at Government Shutdown Notice / Aviso de cierre del gobierno (if you are in the EU), Federal Trade Commission (FTC) at Government Shutdown Notice / Aviso de cierre del gobierno , or the Securities and Exchange Commission (SEC) in case of investment fraud at SEC.gov | Report Suspected Securities Fraud or Wrongdoing (if you are in the US).

6+ years engineering; 3+ years with Node.js and React; strong JS/TS; hands-on AI-driven solutions experience; English proficiency; team collaboration; Agile practices.

Key Responsibilities

• Design architectures
• Integrate AI APIs
• Work with unstructured data

Skills & Tools

TypeScript, Node.js, React, Next.js, React Native, GraphQL, tRPC, Google Cloud Platform, HuggingFace API, LLM APIs, OpenAI API, Langchain, Postgres, Vector Databases

Job Details

• Category: Software Development
• Seniority: Senior Level
• Commitment: Full Time
• Workplace: Remote — Prague or Turkey or Czech Republic
• Languages: English

About Oak's Lab

AI-first software development partner delivering web and mobile applications. — Industry: Information Technology