Senior Full Stack Developer

About On The Spot

We bring startups and disruptive tech companies to the local market, offering engineers the opportunity to work on innovative, high-impact products. Join us and become a member of their R&D team while we take care of employment, HR support, a benefits package, and an enjoyable work environment.

About the team

‍AITHENA is a startup focused on creating an AI-powered tool to enhance the regulatory review process in the pharmaceutical industry.

Our goal is to build an AI-powered assistant for document analysis and review related to pharmaceutical regulations, enabling efficient search and user query responses based on a comprehensive database of legal case documents.

‍

About the role

We are seeking a Senior Full-Stack Developer to build and maintain robust backend services while implementing UI components for their own features within an existing application.

The primary focus will be on backend development — designing scalable APIs, optimizing performance, and ensuring high reliability — while contributing to front-end tasks as needed to deliver complete, end-to-end functionality in an Agile environment.

‍

Responsibilities

• Write clean, concise, and scalable code, ensuring stability and proper unit testing

• Diagnose complex technical issues, evaluate options, and implement optimal solutions

• Implement new requirements in an Agile environment, adhering to architectural principles and standards

• Collaborate with the team to provide input on architecture and design, ensuring solutions are aligned with best practices

• Work on performance optimization, testing, and troubleshooting

  
  

Requirements

• 5+ years of experience in development with Python

• Experienced in frontend development using React

• Strong analytical and troubleshooting skills

• Knowledge of PostgreSQL and experience with designing and implementing data-intensive systems

• Solid understanding of software design principles, concurrency, synchronization, memory management, data structures, algorithms, etc.

• Ability to prioritize and organize effectively with good communication skills

• English B1+

Nice to have

• Basic DevOps skills, including Google Cloud Platform, K8S, Docker, CI/CD, and GitHub actions

• Experience with LLM frameworks (LlamaIndex or LangChain)

• Linux administration skills

‍

Benefits

• Work in a highly professional team. Informal and friendly atmosphere in the team

• Paid vacation — 20 business days per year, 100% sick leave payment for 10 business days

• Equipment provision

• Partially compensated educational costs (for courses, certifications, professional events, etc.)

• Legal and Accounting support in Poland

• Ability to work from our comfortable office in Warsaw at Prosta 51

• 5 sick days per year

• Medical insurance (after the end of the probationary period)

• English and Polish classes 2 times a week (online)