Senior Java Developer

About the role

ShipMonk isn't just a 3PL — we're the tech-powered growth partner for ecommerce brands, running 12+ owned fulfillment centers across the US, Canada, the UK, and Europe so our merchants can stress less and grow more.

We are ShipMonk, and we provide logistics services in order fulfillment. Our main business is in the USA, but our modern platform is built by the Product Development team in Prague.

ShipMonk is a leader in e-commerce fulfillment, and while our business core is in the USA, our technical foundation is built and scaled by our engineers in Prague.

Here at ShipMonk, we process up to 100,000 orders per day in our peak season. Our book of business has more than 1,500 clients, mostly small and medium e-shops based in the US. The ShipMonk platform covers the whole process, from stocking the items to shipping the ready packages to all corners of the world.

The Opportunity

We are looking for a Senior Software Engineer primarily focused on Java (but not afraid to touch other languages) to join our Product Development team in Prague.

The core of our platform is a well-architected PHP modular monolith deployed on Kubernetes. Integrations with external systems, label provisioning, retailer compliance are handled by a set of Java services.

Recently, new initiatives are built with quick iteration in mind. We utilize AI to quickly build prototypes, internal warehouse apps or dbt for data analysis or Vercel apps. If you have a business case, it is up to you to decide what is the best concept for getting it in front of the end-user.

The real work isn't writing greenfield code in isolation. It's designing services that integrate into the existing warehouse processes, handle data transfer and distributed state across merchant ERP systems and the ShipMonk platform safely and consistently. Understanding how the data influences the warehouse processes is as important as scalable application design. The process often crosses the Java / PHP / Frontend boundary, and involves understanding of all parts.

The Stack

We maintain a highly automated, modern environment where the machines do the boring parts.

Backend & DB: Java 25, Maven, Gradle, Spring ecosystem, Hibernate, Spring Data JDBC, PostgreSQL, RabbitMQ, REST APIs.

Infrastructure: Everything is dockerizedand deployed to AWS EKS automatically after code merge. Any merge request can be spun up on its own dev cluster for E2E and manual testing, so nobody fights over a shared test environment.

Workflow & CI/CD: Monorepo and GitLab CI with a strict static-analysis setup (Checkstyle, SpotlessNullAway, security scans, Renovate). Our agreed coding rules are automated, not argued about in reviews.

Testing & Reliability: 35,000+ tests, 8,000+ database integration tests, each with its own independent dataset, so there's no shared data that constantly breaks. Automated AI review, two-round human code reviews.

Observability: HA, failover, and autoscaling across all services, supported by DataDog, Sentry. API documentation is generated automatically from code.