Principal Engineer - Infrastructure

Sezzle

Job Overview

Location

Remote

Salary

USD 200,000 - 30,000 yearly

Employment Type

Full-time

Work Arrangement

Remote

Sector

Information Technology & Software

Experience Level

Executive (12+ years)

Application Deadline

March 17, 2026

About the Company

Sezzle is a dynamic fintech company dedicated to financially empowering the next generation. We are revolutionizing the shopping experience by blending cutting-edge technology with seamless, interest-free installment plans, making shopping smarter and more accessible. Our mission extends beyond payments; we aim to redefine how consumers discover, interact with, and purchase products, while simultaneously driving significant growth for merchants through increased conversions and higher order values. We foster an innovative and inclusive culture, attracting passionate individuals who are eager to push technological boundaries and deliver game-changing experiences. At Sezzle, you'll join a team of talented professionals who are committed to creating more than just transactions, but truly unique shopping journeys. If you're excited about shaping the future of fintech and retail, Sezzle offers a collaborative and purpose-driven environment.

Job Description

Sezzle is seeking a highly accomplished Principal Engineer to spearhead our infrastructure initiatives. This pivotal role offers a unique opportunity to operate with a high degree of autonomy, identifying and resolving complex challenges across our infrastructure, deployments, repositories, and operational systems.

You will be a key driver in scaling our organization, leveraging your extensive experience and the power of AI tooling to enhance efficiency and innovation. This hybrid position is designed for a proactive, results-oriented individual who thrives in a fast-paced, dynamic environment and is passionate about building robust, scalable systems.

To apply for this role, click the Apply button on this page and follow the instructions.

Required Skills

KubernetesAWSRDS (MySQL/Postgres)GolangRESTful APIsSQLDistributed SystemsCI/CDObservability ToolsData EngineeringData PipelinesData WarehousingContainerizationMicroservices

Key Responsibilities

Architect, upgrade, design, and build scalable infrastructure solutions leveraging Kubernetes, AWS, RDS (MySQL/Postgres), and modern distributed patterns.
Drive infrastructure and engineering team roadmaps to enhance reliability, recoverability, and scalability.
Proactively identify and resolve system issues before they impact production through tooling, alerts, AI, and cross-team collaboration.
Lead capacity planning, benchmarking, and stress testing of systems to identify bottlenecks and prepare for business growth.
Define, maintain, and enforce Service Level Agreements (SLAs) and alerts across the infrastructure.
Spearhead Sezzle’s AI enablement efforts, identifying opportunities to apply AI and automation for infrastructure reliability, developer productivity, and internal tooling.
Build 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 foster a culture of learning, innovation, and operational excellence.
Collaborate cross-functionally to translate business goals into technical roadmaps and deliver impactful results.

Qualifications

15+ years of professional software engineering or infrastructure engineering experience, including significant backend development and production engineering.
Proven ability to deploy significant changes to production application or infrastructure configurations within the last 30 days.
Strong proficiency in Golang, with experience building and maintaining RESTful APIs.
Deep expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale.
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.

Benefits & Perks

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