Senior Senior Site Reliability Engineer

Sezzle; Ciudad de México; On-site; MXN 1,457,000 - 2,498,000; Full time

Job summary

Sezzle is seeking a senior Site Reliability Engineer with extensive backend and SRE experience to own and scale our infrastructure. The role emphasizes autonomy to identify and resolve issues across deployments, with a focus on reliability, observability, and AI-enabled improvements.

You will build scalable infrastructure, lead capacity planning, and mentor engineers while aligning technical roadmaps with business goals at Sezzle.

Qualifications

• 12+ years of professional software or infrastructure engineering experience.
• Led significant changes to production infrastructure in recent months.
• Strong Golang expertise and building RESTful APIs.
• Experience with SQL-based RDBMS (MySQL, PostgreSQL).
• Proficiency in observability tools (Prometheus, Grafana, Datadog, New Relic).
• Understanding of distributed systems design patterns.

Responsibilities

• Architect, upgrade, and build scalable infrastructure using Kubernetes and AWS.
• Drive the infra team's roadmap for reliability and scalability.
• Lead capacity planning, stress testing, and bottleneck identification.
• Define and enforce SLAs and alerts across systems.
• Improve signal detection and alerting capabilities.
• Support AI enablement to boost reliability and developer productivity.

Skills

Golang

RESTful APIs

Distributed systems

Leadership

Backend engineering

Education

Bachelor's degree in CS

Tools

AWS

Kubernetes

MySQL

PostgreSQL

Prometheus

Grafana

Datadog

New Relic

Job description

The salary range for this role is negotiable, the range being $7000 - $12000 per month (Gross in USD)

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

Compensation:

For this senior development role, with 12+ years of experience, the compensation range is $7000 - $12000 USD per month. This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level, offering a competitive salary to reflect the value of advanced skills and experience.

About the Role:

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.

What We look for:

• ~12+ 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, Datadoc, 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.

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