Senior Software Engineer I Backend Financial Services

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 usersRated the top-rated point-of-sale (POS) for restaurants, bars, retail, and small businesses by Capterra usersAwarded Great Places to Work and Built In’s Best Workplaces for multiple years runningWe 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.We are seeking a highly skilled Senior Software Engineer to join the Financial Services team. You'll be responsible for designing, implementing, and maintaining robust backend services using our Python-based tech stack. The ideal candidate will have strong expertise in distributed systems, asynchronous processing, and cloud infrastructure as well as experience in payment processing or, more generally, financial services.On a daily basis you will:Design, develop, and implement high-quality software solutions for payment processing.Review code from team members and provide constructive feedback.Enhance the reliability and resilience of our systems through effective monitoring, fault tolerance, and disaster recovery.Drive technical innovation by staying abreast of industry trends, evaluating new technologies, and recommending adoption where appropriate.Contribute to the full software development lifecycle, including requirements analysis, design, implementation, testing, deployment, and maintenance.Collaborate with other engineering teams, product counterparts, and business stakeholders to deliver value to the business.What skill are we looking for?Bachelor’s degree in Computer Science, Engineering, or a related field.Willing to come into our Kraków or Gdańsk office 2-3 times per week.5+ years of experience in software engineering.Prior work on distributed systems and event driven architectures.SQL and relational database proficiency is a firm requirement, PostgreSQL preferred.Python proficiency is required; expertise is preferred but strong candidates with a desire to learn more Python will be considered.Strong problem-solving skills and the ability to troubleshoot complex issues in a production environment.Perfect candidate also has: Working in a financial or another sensitive and regulated domain.AWS services (RDS, S3, etc,). Kubernetes and other modern devops practices including CI/CD.Mongo, Redis or other NoSQL databases is a plus.Snowflake, Airflow, and other data engineering tools.FastAPI, Pydantic, Celery.Here’s a bit about what we have to offer:Competitive pay: 19 500 - 24 400 PLN net on B2B; 16 500 - 20 000 PLN gross on CoE.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.A lot of free parking spots around the office.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.