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Backend Engineer – Java / Data Systems
Location: Remote (Poland/EU) Contractor
Salary: $60,000
About Threecolts
Threecolts is a global software powerhouse for marketplace sellers and e-commerce brands. We help Amazon, Walmart, and multichannel operators scale through our suite of 24+ best-in-class SaaS tools — all available through our bundled solution, Seller 365. With a presence across 42 countries and a mission to support seller success, we're growing fast and hiring smarter.
About the RoleWe’re looking for a Backend Engineer to build and scale high-performance Java services that process massive data volumes, integrate with external systems, and run reliably in production. You’ll work on high-QPS systems, scraping pipelines, and cloud-native infrastructure.
Responsibilities
Location: Remote (Poland/EU) Contractor
Salary: $60,000
About Threecolts
Threecolts is a global software powerhouse for marketplace sellers and e-commerce brands. We help Amazon, Walmart, and multichannel operators scale through our suite of 24+ best-in-class SaaS tools — all available through our bundled solution, Seller 365. With a presence across 42 countries and a mission to support seller success, we're growing fast and hiring smarter.
About the RoleWe’re looking for a Backend Engineer to build and scale high-performance Java services that process massive data volumes, integrate with external systems, and run reliably in production. You’ll work on high-QPS systems, scraping pipelines, and cloud-native infrastructure.
Responsibilities
- Design, develop, and optimize backend services in Java (Spring Boot)
- Build and maintain scalable, concurrent scraping systems (Selenium / Playwright)
- Implement caching, async messaging, and streaming using Redis and Kafka
- Optimize PostgreSQL queries for high-throughput workloads
- Parse and process data from multiple sources and file formats
- Deploy, monitor, and maintain applications on Kubernetes and AWS (EC2, EKS, RDS, S3)
- Tune JVM performance and ensure system scalability
- Set up monitoring, metrics, and alerts using Prometheus and Grafana
- Troubleshoot and improve system reliability and infrastructure
- 4-5 years experience
- Strong Java (Spring Boot) backend development
- PostgreSQL: query optimization, high-throughput environments
- Redis & Kafka for caching and async messaging
- Build concurrent scraping systems (Selenium / Playwright)
- Multithreading, parallel/multiprocessing, async comms
- Parse and process multiple file types (HTML, PDF, CSV, XLS, DOC, Parquet, etc.)
- Deploy & manage apps in Kubernetes (stateless & stateful)
- AWS: EC2, EKS, RDS, S3
- JVM tuning & performance optimization
- Large-scale data transformation/processing
- Monitoring & alerting with Prometheus and Grafana
- Kubernetes infrastructure troubleshooting
- Node.js, TypeScript, Python
- Scraping anti-bot strategies
- AI/LLM-based automation & data processing
Key Skills
Ranked by relevance
java
kubernetes
prometheus
selenium
eks
spring boot
typescript
postgresql
redis
kafka
cloud
saas
aws
jvm
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- Posted
- Aug 28, 2025
- Type
- Full-time
- Level
- Entry
- Location
- Cracow
- Company
- Threecolts
Industries
IT Services
IT Consulting
Categories
Other
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