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Urgent! MongoDB Expert with Scala Position in Gdańsk - Scalac

MongoDB Expert with Scala



Job description

MongoDB Expert with Scala


📍 Remote | EU Time Zone | Contract / B2B


We’re looking for a Senior Scala Developer with strong MongoDB expertise to join a high-impact project with one of our clients.

This is an opportunity to tackle complex technical challenges in a system that’s critical for the client’s operations, while also shaping the long-term architecture.


 


About the Project


Our client operates around 30 microservices built in Scala, all using MongoDB Scala Driver as their primary database.

The system currently relies heavily on transactions across multiple collections, which has led to:




  • ~1 million MongoDB sessions open simultaneously




  • Terminated transactions due to overload




  • Severe performance issues with queues of up to 2–4 hours




The client recognizes this approach isn’t sustainable and wants to fix the short-term issues while also redesigning the long-term architecture.


 


Your Role


You will play a key role in both the stabilization and the future redesign of the platform:


Short-term goals:




  • Investigate why so many sessions/transactions are created




  • Fix code and/or adjust MongoDB Driver usage to stabilize operations




Long-term goals:




  • Redesign the shared data model across 30 services to eliminate the need for transactions




  • Provide guidance and hands-on support in implementing a scalable, transaction-free architecture




  • Potentially tune and optimize MongoDB for high-performance workloads




 


What We’re Looking For




  • Proven experience with Scala (production-grade systems, microservices architecture)




  • Deep knowledge of MongoDB (transactions, drivers, performance optimization)




  • Strong problem-solving and debugging skills in distributed systems




  • Experience with data model redesign and building scalable, high-performance architectures




  • Ability to work independently and provide technical leadership




Nice to have:




  • Experience with MongoDB cluster tuning and performance optimization




  • Background in large-scale system migrations or refactorings




 


Why Join




  • Work on a technically challenging project that directly impacts system performance




  • Chance to influence and redesign a critical data model used across 30+ services




  • Remote-first engagement with flexibility




  • Rate up to 40 EUR/h 




 


🚀 If you’re an experienced Scala + MongoDB expert who enjoys solving deep technical challenges and building scalable solutions, we’d love to hear from you.


Apply now or reach out to learn more!


Required Skill Profession

Computer Occupations



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