Senior Fullstack Engineer (AI Focused)

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

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

• 85+ 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.

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

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

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.

• 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

• 3+ years of experience in building web solutions using (a) Node.js or (b) React with another programming language (Java, Python, .NET etc)

• Experienced with Javascript/Typescript

• 5+ years in engineering

• 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

• 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

Note: You don’t need experience with all the above technologies as we are happy to upskill in certain areas.

BENEFITS

• Flexible working hours

• 26 days off + 1 additional day for every year working with OAK’S LAB (capped at 30 days)

• Top-of-the-line MacBook and hardware budget

• Budget to spend on your growth (books, courses, conferences)

• Free English lessons

• Team bonding, happy hours, online games, annual offsite trips

• Outside of work activity clubs (yoga, traveling, football, tennis, etc.)

• Snacks and drinks in the office, weekly pizza, monthly breakfast

• Landmark office right on Old Town Square (dog-friendly)

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).