About ThredUp
ThredUp is transforming resale with technology and a mission to inspire the world to think secondhand first. By making it easy to buy and sell secondhand, ThredUp has become one of the world's largest online resale platforms for apparel, shoes and accessories. Sellers love ThredUp because we make it easy to clean out their closets and unlock value for themselves or for the charity of their choice while doing good for the planet. Buyers love shopping value, premium and luxury brands all in one place, at up to 90% off estimated retail price. Our proprietary operating platform is the foundation for our managed marketplace and consists of distributed processing infrastructure, proprietary software and systems and data science expertise. With ThredUp’s Resale-as-a-Service, some of the world's leading brands and retailers are leveraging our platform to deliver customizable, scalable resale experiences to their customers. ThredUp has processed over 172 million unique secondhand items from 55,000 brands across 100 categories. By extending the life cycle of clothing, ThredUp is changing the way consumers shop and ushering in a more sustainable future for the fashion industry.
Recognized on TIME Most Influential Companies of 2023, Digiday's WorkLife 50 2023, TIME's Best Inventions of 2022, and Lattice's People Success Awards 2022.
How You Will Make An Impact: As a Senior Engineer, Infrastructure, you will design, build, and evolve the core infrastructure that powers ThredUP, with a particular focus on the reliability, performance, and operability of our database estate. Reporting to the Director of Engineering, you’ll lead cross-team initiatives and partner with stakeholders to ensure our systems are scalable, cost-effective, and secure.
This is an infrastructure-first role for an engineer who is equally comfortable owning production AWS Aurora (MySQL, PostgreSQL). You’ll spend most of your time on cloud-native infrastructure, orchestration, and automation, while serving as the team’s go-to person for database operations, performance tuning, and safe schema evolution. You will play a key role in defining our technical direction and ensuring our platform enables the rapid growth of our marketplace.
In This Role You'll Get To: Scope & Impact
Lead or significantly contribute to medium-to-large infrastructure projects crossing multiple engineering teams.
Serve as a domain expert in cloud infrastructure, orchestration, observability, and platform automation, and as the team’s primary owner of database reliability and performance.
Ensure ThredUP’s infrastructure evolves to support scale, resilience, and developer productivity.
Technical Execution
Architect and implement highly available, secure, and cost-efficient cloud infrastructure using AWS, Kubernetes (EKS), and Terraform.
Drive improvements in CI/CD, observability, networking, and security across the platform.
Provide high-quality, impactful technical contributions across infrastructure projects, setting engineering standards.
Participate in and lead design reviews, providing constructive feedback and driving engineering excellence.
Database Engineering
Operate, monitor, and tune AWS Aurora and RDS clusters (MySQL and PostgreSQL), including parameter groups, maintenance, minor/major upgrades, and point-in-time restores.
Own HA and replication behavior: respond to failovers, work with cluster vs. instance endpoints, and run the checks required before promoting a reader to writer.
Triage and resolve CPU/IO/locking/replication incidents; analyze slow query logs and EXPLAIN/EXPLAIN ANALYZE plans to produce immediate mitigations and long-term fixes.
Plan and execute zero-downtime schema changes with safe rollback paths (online DDL, gh-ost / pt-online-schema-change, pg_repack, logical replication, trigger-based backfills).
Partner with application teams to remove N+1 queries, tune indexes, and rewrite inefficient predicates; design partition
