Senior Fullstack Engineer

Summary

Join a fast-growing AI-driven PropTech startup as a Senior Software Engineer and play a key role in shaping their AI-powered home management platform. This remote position offers a competitive salary (33-38k PLN on B2B), flexible working hours, 26 paid working days off, and the opportunity for equity ownership. You will own and drive the development of end-to-end features using React.js and Python, collaborating with a talented team. The ideal candidate possesses 5+ years of software engineering experience, including expertise in React.js and Python (FastAPI), and a strong understanding of frontend performance optimization and scalable backend architectures. This is a unique opportunity to contribute to a revolutionary product and experience rapid career progression within a dynamic startup environment.

Requirements

• 5+ years of experience in software engineering, including at least 1 year in a senior role, with expert-level proficiency in React.js and Python (FastAPI or similar framework)
• Deep understanding of frontend performance optimization, API design, and scalable backend architectures
• Experience in fast-paced environments or startups, where rapid iteration and delivery are key
• Strong sense of ownership and a delivery-focused mindset—comfortable driving projects independently from start to finish
• Familiarity with best practices in testing, CI/CD, and cloud infrastructure
• Excellent problem-solving and communication skills, with a collaborative approach to working with Product, Design, and Engineering teams
• Fluent in English (B2+ minimum) for effective communication

Responsibilities

• Own and drive the development of end-to-end features across React.js (web) and Python (FastAPI)
• Ship high-quality, scalable, and performant solutions, ensuring seamless frontend-backend integration
• Work closely with Product and Design to turn ideas into polished, user-centric features
• Take full ownership of major features, driving them from ideation to launch, balancing speed and scalability
• Maintain high code quality through reviews, testing (unit, feature, and e2e), and CI/CD pipelines
• Work together with the current Backend Engineer to develop and maintain cloud infrastructure (AWS, Docker is a plus)
• Collaborate with fellow engineers (Frontend, Backend, and AI) to solve technical challenges and scale the platform
• Identify and remove bottlenecks in the development process to improve velocity

Preferred Qualifications

• Experience with React Native, as we plan to build a mobile app in the future
• Familiarity with Gen AI technologies, RAG & ReAct Models, LangChain, LLMs

Benefits

• Salary and type of contract: 33-38k PLN on B2B (and 0.3%+ ownership in the company, subject to a 4-year vesting schedule with a 1-year cliff, along with planned equity option grants in the future)
• Fast progression pathway and compensation review as the company grows
• Holiday: 26 paid working days off + sick leave
• Equipment: MacBook
• Working hours: flexible (but there are dailies, plannings and retros they want you to part in)
• Working mode: 100% remotely (with quarterly offsites in London’s HQ and occasional meetups in Poland