Senior Software Engineer, Replication
MongoDB · United States
About this role
**Senior Software Engineer, Replication** MongoDB’s Replication Team builds the infrastructure that enables **high availability**, **fault tolerance**, **automatic failover**, and **tunable consistency**. As a Senior Engineer, you’ll design and implement distributed-systems features that protect data and keep applications available under demanding operating conditions. You’ll primarily work in **C++** on core database code, partner with engineers across MongoDB, and help shape features central to major MongoDB releases—applying distributed-systems fundamentals to problems in **data consistency**, **recovery time**, **replication performance**, and **operability**. > **Hybrid working model:** Candidates should be based near one of our MongoDB office locations. --- ## What you will do - 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++** plus 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 - 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 to improve team quality - Interview candidates and mentor junior engineers and interns --- ## What you bring ### Required - At least **5 years** of experience programming, debugging, and performance-tuning distributed or highly concurrent software systems - Strong systems fundamentals: 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 issues across system boundaries - Strong written and verbal technical communication skills - Collaborative approach and ability to assess project complexity and delivery risk realistically ### Preferred - 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** (not required to cover every area) - 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 --- ## What success looks like **In your first month** - Build a working understanding of MongoDB’s replication architecture, development workflow, and testing strategy - Start resolving scoped bugs and contribute effectively to code reviews **In your first three months** - Contribute production C++ code to a project targeted for an upcoming MongoDB release - Diagnose and resolve issues identified by testing, customers, or partner teams **In your first six months** - Take regular ownership of code reviews and participate
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