Sezzle - Principal Engineer
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Requirements
• 15+ years of professional software engineering or infrastructure engineering experience, including significant backend development and production engineering experience. • 15+ years • Deployed significant changes to a production application or infrastructure configuration in the past 30 days. • Strong proficiency in Golang, with experience building and maintaining RESTful APIs. • Golang • RESTful APIs • Deep expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale. • SQL-based RDBMS • Solid understanding of distributed systems design patterns (e.g., transactional outbox, event-driven architecture and stream processing, queues). • distributed systems design patterns • Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives. • bring new ideas forward • Bachelor’s degree in Computer Science or equivalent practical experience. • Familiarity with AI developer tooling like Claude Code, Gemini CLI, Codex, Cursor and using it to be a more productive engineer. • AI developer tooling like Claude Code, Gemini CLI, Codex, Cursor • Experience with AWS cloud infrastructure, mainly AWS Aurora RDS, both MySQL and Postgres. • AWS cloud infrastructure • Proficiency in observability tools (Prometheus, Grafana, Datadog, New Relic). • observability tools • Experience with data engineering, data pipelines and data warehousing. • Experience with CI/CD pipelines and deploying containerized microservices in Kubernetes. • CI/CD pipelines • containerized microservices • Track record of shipping commercial APIs and data-driven applications in high-growth environments. • commercial APIs and data-driven applications • Proven leadership in guiding technical direction, improving system reliability, and scaling high-traffic services. • You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed. • You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things • You’re not bound by convention • You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking. • You need action • You earn trust - you listen attentively, speak candidly, and treat others respectfully. • You earn trust • You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly. • You have backbone; disagree, then commit • You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle. • You deliver results • Sezzle’s Technology Stack: • Languages: Golang, Typescript, Python • Languages: • Frontend: Typescript - React and React Native • Frontend: • Backend: Golang • Backend: • Database: MySQL, Postgres, Elasticsearch • Database: • DevOps & Cloud: AWS, Kubernetes • DevOps & Cloud: • Version Control: Git • Version Control: • CI/CD: • Testing: Developer and AI-driven, focus on automated end-to-end, integration, and unit tests • Testing: • Open Source: Sezzle is focused on using open source, and we build what we can before buying! • Open Source: • What Makes Working at Sezzle Awesome? • At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
Responsibilities
• Architect, upgrade, design, and build scalable infrastructure solutions leveraging Kubernetes, AWS, RDS (MySQL/Postgres), and modern distributed patterns. • Architect, upgrade, design, and build • Kubernetes • RDS (MySQL/Postgres) • Help drive the infrastructure and engineering teams’ roadmaps, leading us to higher levels of reliability, recoverability, and scalability. • Find and fix issues across our systems before they become issues in production, through tooling, alerts, AI, collaboration with teams, whatever it takes. • Drive capacity planning, benchmarking, and work with the team to stress test our systems, find bottlenecks, and prepare for further growth in the business. • Define, maintain and enforce SLAs and alerts across our infrastructure. • Help Lead Sezzle’s AI enablement efforts, identifying opportunities to apply AI and automation to enhance infrastructure reliability, developer productivity, and internal tooling. • Help Lead Sezzle’s AI enablement efforts • Build in consistency and scalability across a distributed microservices architecture while maintaining performance and reliability. • distributed microservices architecture • Establish and evolve engineering best practices for observability, security, and CI/CD across teams. • engineering best practices • Mentor engineers and champion a culture of learning, innovation, and operational excellence. • Collaborate cross-functionally to translate business goals into technical roadmaps and deliver results that matter. • translate business goals into technical roadmaps
Benefits
• Unlimited PTO, volunteer hours and sabbatical • Life, STD/LTD, medical, dental and vision insurance • Highly discounted LifeTime gym membership • 401k with match • Collaborative fun co-workers • The opportunity to join the fastest growing FinTech alongside a team of motivated and driven individuals • CCPA Disclosure: Sezzle Inc. is committed to protecting the privacy of our job applicants. In compliance with the California Consumer Privacy Act (CCPA), we inform California residents about the personal information we may collect, the purposes for its collection, and your rights under the CCPA. For details about the categories of personal information we collect and your rights under the CCPA, please visit the California Office of the Attorney General's CCPA page. By submitting your application, you acknowledge that you have read and understood this CCPA disclosure. • CCPA Disclosure:
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