Senior Fullstack Engineer - Typescript/React/Node

Senior Software Engineer (Node&React)

OAK'S LAB

**This is a remote position open to candidates in Europe. For those based in the Czech Republic, a hybrid work model is also 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 looking for a Senior Fullstack Engineer who combines creative thinking, exceptional problem-solving skills, and technical expertise to build outstanding web and mobile applications for our clients. You’ll play a key part in building and scaling impactful digital products from the ground up. You’ll work as part of a dedicated product team alongside a Tech Lead, Product Manager, Designer, and a talented group of engineers, driving the success of innovative companies. Your role will involve everything from participating in high-level technical discussions to engineering and deploying complex features, giving you full ownership across the entire product development lifecycle. For ambitious engineers, we’ll provide the time, mentorship, and opportunities to step into a leadership role, where you can guide and mentor your own team over the longer term. You’ll also have the opportunity to join our internal AI Guild, a community where engineers share insights, experiment with cutting-edge AI tools, and learn from one another. RESPONSIBILITIES * Design, develop, and version high-quality web and mobile applications * Collaborate with product teams to understand feature requirements and translate them into technical solutions * Be accountable for an area of the application, its delivery, production-level quality, and its effective presentation to stakeholders * Understand the product and user needs to prioritize business value and functionality * Ensure the application meets all requirements of security and scalability * Write clean and scalable code * Engage in code reviews, provide constructive feedback, mentoring less senior engineers SKILLS & REQUIREMENTS * 5+ years of experience in building web solutions using Node and React * Experienced with Javascript/Typescript * Focus on code quality * Desire to learn new technologies and apply AI in your workflow * 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 * Proficient in English * Experience with Python is beneficial but not essential OUR TECH STACK * Typescript * Node.js * React + Next.js * React Native * GraphQL, tRPC * Material UI * Playwright * PostgreSQL * Google Cloud Platform * Python * HuggingFace API, LLM APIs (eg OpenAI API), Langchain, 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., john@oakslab.com or john@oaks-lab.com). 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).

Senior Fullstack Engineer

fonio

ÜBER FONIO Wir bauen KI-Telefonassistenten für kleine und mittelständische Unternehmen – damit keiner ihrer Anrufe mehr verloren geht und sie sich auf das Wesentliche konzentrieren können. Unsere KI beantwortet jeden Anruf automatisch. Aber Voice ist erst der Anfang. Unsere Vision ist es, das erste vollautomatisierte CRM-System der Welt zu entwickeln. 8.000+ Kunden. >€5M ARR. ~30% monatliches Wachstum. Ziel bis EOY: €30M. Wir leben Ownership. Du bist für deine Projekte und Aufgaben end-to-end verantwortlich. Keine Politik, wenige Meetings, direktes Feedback. Bei fonio wirst du gemeinsam mit den smartesten und ambitioniertesten Menschen weit und breit bauen. Bewirb dich jetzt und werde Teil einer der krassesten Wachstumsstorys Europas!   DEINE ROLLE Als Senior Fullstack Engineer übernimmst du End-to-End Ownership: von der Idee über den Prototyp bis hin zum fertigen Feature, das von tausenden Unternehmen europaweit genutzt wird.   WEN WIR SUCHEN Senior Fullstack Engineers bei fonio haben volle Ownership über den value, den sie für unsere Kunden stiften. Es gibt bei uns niemanden, der dir sagt was Du bauen sollst - das definierst Du selbst. * Extremes Growth Mindset * Viel Erfahrung mit TypeScript, React und Node.js (idealerweise NestJS) in einem SaaS-Produkt * Pragmatismus: Du zerlegst Features in die essenziellen Teile, die sofort Kundennutzen schaffen - und entwickelst sie mit neuen Erkenntnissen weiter * Deutsch als Muttersprache, um unsere KI aktiv mitzugestalten, sowie fließend Englisch.   DEINE AUFGABEN * Weiterentwicklung unserer Plattform in NestJS & React * Direkter Austausch mit Kunden (Support, Feedback, User-Tests) * Mittelfristig: Übernahme der Feature / Opportunity Priorisierung unserer Voice AI   WAS WIR DIR BIETEN * Kompetitives Gehalt: €80.000-€120.000 pro Jahr * 100% Remote: Falls du aber Lust auf Office hast, haben wir eines der coolsten Offices im 7. Bezirk in Wien (Lunch & Dinner included) * 100% Focus Time (keine regulären Meetings) * Unlimited Budget, wenn der ROI stimmt * Extremer Speed (wir shippen fast täglich) * Tausende begeisterter Kunden, die das Produkt gemeinsam mit uns entwickeln.   BEWERBUNGSPROZESS 1. 15 min Kennenlernen 2. 30 min Deep Dive mit CTO & Co-Founder Matthias 3. 90 min Technical Interview mit Case Study / Live Coding 4. 20 min Culture Fit mit den Gründern

Senior Fullstack Engineer (AI Focused)

OAK'S LAB

**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., john@oakslab.com or john@oaks-lab.com). 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).