Senior Software Engineer, Replication

MongoDB’s Replication Team builds infrastructure for high availability, fault tolerance, automatic failover, and tunable consistency. The Senior Software Engineer designs and implements distributed-systems features in core database code, improving data protection, recovery, replication performance, and application availability.

Responsibilities:

• Design and implement production features across the replicated data lifecycle
• Improve restore and recovery workflows with attention to recovery time objectives
• Improve replication lag, throughput, and flow control; measure performance and prevent or resolve regressions
• Write production-quality C++ and the unit, integration, and system tests needed to demonstrate its correctness
• Use JavaScript and Python where appropriate to extend test coverage and validate end-to-end behavior
• Collaborate with partner engineering teams and stakeholders on large, cross-functional initiatives
• Investigate distributed-systems issues raised by customers and Technical Support, communicate findings clearly, and deliver durable fixes
• Participate in code reviews, design reviews, and technical discussions that improve the quality of the team’s work
• Interview candidates and mentor junior engineers and interns

Requirements:

• At least five years of experience programming, debugging, and performance-tuning distributed or highly concurrent software systems
• Strong systems fundamentals, including multithreaded programming, concurrency, debugging, and performance profiling
• Practical experience with distributed-systems concepts such as replication, data consistency and durability, recovery, fault tolerance, or consensus protocols
• Experience working with complex production codebases and diagnosing problems that cross system boundaries
• Strong written and verbal technical communication skills
• A collaborative approach and the ability to make realistic assessments of project complexity and delivery risk
• Professional experience developing production software in C++
• Familiarity with database internals or core components of data-processing systems
• Experience with replication, recovery, data consistency, or Raft/another consensus protocol; direct experience with every area is not expected
• Experience writing unit, integration, and end-to-end tests in C++, JavaScript, or Python
• Experience responding to customer-impacting production issues in distributed systems
• Experience mentoring engineers or interns and contributing to technical hiring