Senior Software Engineer II (Python, Payments)

O projekcie: We’re not just building restaurant tech—we’re giving independent restaurants the tools to compete and win. From our award-winning point-of-sale to AI-powered profit tools, everything we do helps operators boost profit, work smarter, and keep their best people. And every solution is backed by real humans who actually give a sh*t about helping restaurants succeed. - Named the #1 Restaurant POS by G2 (Fall 2025), based on ratings from real users - Rated the top-rated point-of-sale (POS) for restaurants, bars, retail, and small businesses by Capterra users - Awarded Great Places to Work and Built In’s Best Workplaces for multiple years running We move fast, care hard, and fight for independent restaurant operators to do what they love, and love doing it. If you’re looking to make an impact with heart and hustle, SpotOn is the place for you. As a Senior Software Engineer on our Data and Reporting team, you'll be responsible for designing, building, and maintaining high-performance, scalable data systems and data infrastructure. You will collaborate closely with cross-functional teams, including product management, engineering leadership, to enhance existing platforms and develop innovative solutions for complex data-driven applications. Here’s a bit about what we have to offer: - Competitive pay: 23 800 - 29 800 PLN net on B2B. - Training budget 3500 PLN gross per year. - Access to e-learning platforms (O’Reilly). - Fully paid private healthcare in LuxMed. - Access to the Worksmile platform with a monthly top-up. - Subsidized access to breakfast and lunch through the vending machine in Kraków office, and lunches in Gdańsk office once a week. - Group English classes with a native speaker. - New Macbook Pro, 4K monitors or whatever tools you need. - Flexible working hours. - New, modern, bright and comfortable office space in the city centre. - Access to the company’s library. - Great working atmosphere. - Chill out room with a PlayStation and games. - Free snacks and beverages in a kitchen. - Company parties and social activities. - Employee referral program. - Relocation Package within Poland. Wymagania: What skill are we looking for? - You’ve spent 5–7 years building production systems, with at least 3 years working deeply in Python. - You are willing to work in a hybrid setup, coming into our Kraków or Gdańsk office 2–3 times per week. - You are highly proficient in Python and at least one modern framework (Django, FastAPI, or Flask), and you take ownership of what you build—from design through production. - You have strong experience building and consuming APIs, and understand how systems communicate, fail, and scale in real-world environments. - You are comfortable with both SQL and NoSQL databases, and can analyze data, write efficient queries, and reason about performance. - You write clean, maintainable code and apply solid engineering principles and design patterns consistently. - You use AI tools as part of your daily workflow to move faster, solve problems, and improve code quality. - You are familiar with modern infrastructure and deployment practices, including AWS, Kubernetes, and Terraform, and understand how your code behaves in production. - You have a solid command of English (min. B2) and are ready to collaborate in person at our Kraków or Gdańsk offices 2-3 times a week. Codzienne zadania: - Own backend systems end-to-end—from design and implementation to deployment and monitoring. - Build, improve, and maintain services to support real-world transaction flows with a focus on reliability and performance. - Design and evolve APIs, ensuring they are scalable, resilient, and easy to integrate with. - Collaborate with engineers and stakeholders to define solutions, address system limitations, and make sound technical decisions. - Identify and resolve performance bottlenecks, bugs, and edge cases in production environments. - Participate in code reviews, mentor engineers, and raise the bar on code quality and best practices. - Proactively identify technical debt and drive improvements before they become blockers.