Principal Engineer - Data Infrastructure (Rosario)

Compensation
The compensation for this principal development role is $6,000-$12,500 USD per month (gross in USD), based on location and experience level.
This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level.
About the Role
We are seeking a talented and motivated Principal Engineer for our Data Infrastructure.
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.
What you'll do
End‐to‐end ownership of our database and data warehousing infrastructure, its KPIs and SLAs, including MySQL, Postgres, CDC capture, and Redshift.
Lead optimizations in database and query performance.
Build and maintain tooling to help manage and upgrade our data infrastructure, continually improving with migrations and optimizations.
Partner with Development to ensure we ship solid queries against a battle‐tested schema to meet the needs of our products and business.
Help Sezzle evolve our data systems beyond the current scale and stack with whatever tooling is necessary to handle processing high volumes of writes and events while performing complex ETL.
Evaluate and integrate new technologies, guiding the evolution of Sezzle's data infrastructure.
Help data engineers and analysts optimize Redshift and warehouse performance, including query tuning, modeling improvements, and cost management.
What we look for
12+ years of experience in DBA, SRE, or Data Engineering roles, with a strong track record of scaling production‐grade systems.
Deep expertise with MySQL, Postgres, AWS Redshift, or similar products, including performance tuning, table design, and workload management.
Advanced proficiency in SQL.
Strong hands‐on experience with data replication and ETL/ELT frameworks, especially DBT, AWS DMS, or similar tools.
Strong understanding of data modeling, distributed systems, and warehouse/lake design patterns.
Ability to work in a fast‐paced, collaborative environment with excellent communication and documentation skills.
Preferred knowledge and skills
Prior experience in high‐growth, data‐intensive fintech or similar regulated environments.
Knowledge of lakehouse architectures and modern stacks such as Snowflake, Databricks, Iceberg, or Delta Lake.
Some background in designing scalable, fault‐tolerant data pipelines using modern orchestration tools (Airflow, Dagster, Prefect, etc.) processing anywhere from 100 GB to 1 TB of new data a day.
Familiarity with streaming technologies (Kafka, Kinesis, Flink, Spark Streaming).
High enthusiasm for using AI to be as productive as possible.
About you
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 are 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.
Many decisions and actions are reversible and do not need extensive study.
We value calculated risk‐taking.
You earn trust – you listen attentively, speak candidly, and treat others respectfully.
You have a 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 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.
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 builds what we can before buying!
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