Senior Software Engineer (Poland)

About Sezzle: With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible. We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values. As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey. If you’re excited about pushing boundaries in tech and delivering a game-changing experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping! About the Role: We are seeking a talented and motivated Senior Software Engineer who is best in class with a high IQ plus a high EQ. This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement. As a Senior Software Engineer with Sezzle, you will work with a highly-motivated team to tackle interesting and challenging problems across multiple areas of the organization. Your experience and guidance will help other members of the team level-up their own skills as well. In this backend focused role, you will work closely with stakeholders from Product, Support and the business. You’ll also partner with other engineering teams to provide high-quality, scalable, and innovative solutions to internal and customer problems. Your day-to-day responsibilities will include designing, developing, and delivering new features, as well as unblocking and mentoring your teammates. This role has both an internal and external focus, your contributions will make a meaningful difference in the day-to-day lives of your peers at Sezzle, enhancing their ability to support our business and customers, and you will have opportunities to take any feedback and iterate. Interview Process We believe transparency is important at Sezzle. Regularly providing feedback while setting expectations is part of our culture starting with the interview process. Advancement through each step is not guaranteed. • Application submitted (you are here) • Wonderlic test (30-40 min) • Coding assessment (~1.5 hours) • Interview with recruiters (30 min) • Interview with engineers (1 hour) • Interview with engineering leadership (30-45 min) • Offer! What you'll do: • Design software applications and features in Golang and React • Help build out a distributed architecture, creating solutions that work within it, maintaining consistency while scaling highly • Coordinate with internal company stakeholders to design market winning products • Develop and collect metrics to drive continuous improvement of existing products • Deliver high quality features which can be tested and adheres to reporting standards • As needed, lead small development teams to bring a project to market • Mentor other engineering teammates to help elevate their experience and knowledge What We Look For: • At least 7 years of full-stack software engineering experience • Experience bringing new ideas and building consensus on the path forward • Experience with building and serving REST APIs using Go (preferably) and Java Python or a similar language. • Experience working in a distributed, cloud-based architecture, with either design patterns like transactional outboxes, or queuing tools like RabbitMQ, SQS, Kafka • Demonstrated experience working with Claude or equivalent large language model tools is required; candidates must be co