Software Engineer 3
Build and improve MongoDB’s distributed replication infrastructure using C++ and the Raft consensus protocol. The role requires at least five years of experience with distributed or highly concurrent systems, strong debugging and performance skills, and experience delivering production software.
About the job
Responsibilities
- 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 unit, integration, and system tests to demonstrate correctness.
- Use JavaScript and Python 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.
- 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 consensus protocols, replication, distributed transactions, or fault tolerance.
- Experience working with complex production codebases and diagnosing problems across subsystem boundaries.
- Strong written and verbal technical communication skills.
- A collaborative approach and the ability to assess project complexity and delivery risk realistically.
Preferred Qualifications
- 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, or Python.
- Experience responding to customer-impacting production issues in distributed systems.
- Experience mentoring engineers or interns and contributing to technical hiring.
Compensation and Benefits
- U.S. base salary range: $106,000–$209,000 USD.
- Eligible benefits may include equity, employee stock purchase program, flexible paid time off, 20 weeks of fully paid gender-neutral parental leave, fertility and adoption assistance, a 401(k) plan, mental health counseling, transgender-inclusive health insurance coverage, and health benefits offerings.
Skills
C++, Distributed Systems, Raft, Concurrency, Multithreading, Database Internals, JavaScript, Python, Performance Profiling, Unit Testing, Integration Testing, End-To-End Testing, Fault Tolerance
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