[Hiring] Site Reliability Engineer II @Sezzle

Role Description

We are seeking a talented and motivated best-in-class Senior Site Reliability Engineer. 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 SRE with Sezzle, you will have a high degree of autonomy and authority to identify and resolve problems you see in our infrastructure, deployments, operational workload, and overall systems.

You should consider yourself a DOer to be a good fit for this role. We expect you to bring a deep well of experience to play, and with AI tooling, you should be a force for scaling in the organization.

What you'll do:

• Architect, upgrade, design, and build scalable infrastructure solutions leveraging Kubernetes, AWS, RDS (MySQL/Postgres), and modern distributed patterns.
• Help drive the infrastructure team’s roadmap, leading us to higher levels of reliability, recoverability, and scalability.
• 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.
• Lead the teams towards stronger signal anomaly detection, better, more flexible alerting.
• Help Lead Sezzle’s AI enablement efforts, identifying opportunities to apply AI and automation to enhance infrastructure reliability, developer productivity, and internal tooling.
• Build in consistency and scalability across a distributed microservices architecture while maintaining performance and reliability.
• Establish and evolve engineering best practices for observability, security, and CI/CD across teams.
• 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.

Qualifications

• 3+ years of professional software engineering or infrastructure engineering experience, including significant SRE and backend experience.
• 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.
• Expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale.
• Proficiency in observability tools (Prometheus, Grafana, Datadog, New Relic).
• Solid understanding of distributed systems design patterns (e.g., transactional outbox, event-driven architecture and stream processing, queues).
• Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives.
• Bachelor’s degree in Computer Science or equivalent practical experience.

Preferred Knowledge and Skills

• Experience with AWS cloud infrastructure, mainly AWS Aurora RDS, both MySQL and Postgres.
• Experience with data engineering, data pipelines and data warehousing.
• Experience with CI/CD pipelines and deploying containerized microservices in Kubernetes.
• Familiarity with AI developer tooling like Claude Code, Gemini CLI, Codex, Cursor and using it to be a more productive engineer.
• Track record of shipping commercial APIs and data-driven applications in high-growth environments.
• Proven leadership in guiding technical direction, improving system reliability, and scaling high-traffic services.

About You

• You have relentlessly high standards - many people may think your standards are unreasonably high.
• You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things.
• You need action - speed matters in business.
• You earn trust - you listen attentively, speak candidly, and treat others respectfully.
• You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree.
• You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion.

Sezzle’s Technology Stack

• Languages: Golang, Typescript, Python
• Frontend: Typescript - React and React Native
• Backend: Golang
• Database: MySQL, Postgres, Elasticsearch
• DevOps & Cloud: AWS, Kubernetes
• Version Control: Git
• CI/CD: Gitlab
• Testing: Developer and AI-driven, focus on automated end-to-end, integration, and unit tests
• Open Source: Sezzle is focused on using open source, and we build what we can before buying!

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.