Software Engineer 3

MongoDB’s Replication Team builds the infrastructure that enables high availability, fault tolerance, automatic failover, and tunable consistency. As an engineer on the team, you will design and implement distributed-systems features that protect data and keep applications available under demanding operating conditions.

You will work primarily in C++ on core database code, partner with engineers across MongoDB, and help shape features that are central to major MongoDB releases. This is an opportunity to apply distributed-systems fundamentals to a widely used database while solving challenging problems in correctness, performance, and operability.

We're looking to speak with candidates based in New York City for our in-office working model.

What you will do

• Design and implement replication features based on the Raft consensus protocol
• Improve failover behavior, availability, correctness, and performance across the replication system
• Write production-quality C++ and the unit, integration, and system tests needed to demonstrate correctness
• Use JavaScript and Python where appropriate to extend test coverage and validate end-to-end behavior
• Diagnose test failures, investigate bugs, and drive issues through root-cause analysis and resolution
• Measure the performance impact of code changes and prevent or resolve regressions
• 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 help 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

What you bring

Required

• 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 one or more distributed-systems concepts, such as consensus protocols, replication, distributed transactions, or fault tolerance
• Experience working with complex production codebases and diagnosing problems that cross subsystem boundaries
• Strong written and verbal technical communication skills
• A collaborative approach and the ability to make realistic assessments of project complexity and delivery risk

Preferred

• Professional experience developing production software in C++
• Familiarity with database internals or core components of data-processing systems
• Experience with Raft or another consensus protocol
• Experience writing unit, integration, and end-to-end tests in C++, JavaScript