Hi! I'm Vladislav Oleshko.
Systems engineer specializing in high-performance C++, databases, storage, concurrency and I/O.
Fascinated with programming and computers since my childhood, winning competitions in my teenage years and building new technologies in my career.
📍 Warsaw, Poland
C++
Rust
Go
Python
Concurrency
Fibers & coroutines
Async I/O
io_uring
Linux
Performance engineering
Profiling
Benchmarking
Memory management
Data structures
LLM agents / MCP
Core Software Engineer at DragonflyDB
August 2022 - present (4 years)
Multithreaded asynchronous Redis replacement written in C++
First engineering hire — helped take Dragonfly from early prototype to a trusted in-memory database with hundreds
of thousands of deployments worldwide
Development
• Designed and implemented core components from scratch: replication, structured and vector search, data tiering
• Led SSD data tiering from prototype to general availability: io_uring-based offloading, packing small values into shared pages, defragmentation, snapshotting, replication and clustering
• Optimized and extended multithreaded transaction runtime supporting millions of ordered (serializable) operations per second
• Extended helio
,
the open-source fiber runtime behind Dragonfly: scheduler, synchronization primitives, io_uring abstraction
• Built randomized data generation and consistency-checking test infrastructure for replication and snapshots
• Reviewed code and shaped designs across core areas with the team, planned refactorings, drove adoption of new C++ features (like coroutines)
Systems & Optimization• Led SSD data tiering from prototype to general availability: io_uring-based offloading, packing small values into shared pages, defragmentation, snapshotting, replication and clustering
• Optimized and extended multithreaded transaction runtime supporting millions of ordered (serializable) operations per second
• Extended helio
,
the open-source fiber runtime behind Dragonfly: scheduler, synchronization primitives, io_uring abstraction • Built randomized data generation and consistency-checking test infrastructure for replication and snapshots
• Reviewed code and shaped designs across core areas with the team, planned refactorings, drove adoption of new C++ features (like coroutines)
• Profiled and optimized microsecond-scale hot paths (caching, prefetching, reordering,
contention, allocations, etc)
• Optimized I/O patterns: provided buffers, scatter-gather and batched submissions, fewer copies and syscalls
• Ran multi-node latency benchmarks that correct for coordinated omission, covering scenarios like mixed workloads under replication failover
Production• Optimized I/O patterns: provided buffers, scatter-gather and batched submissions, fewer copies and syscalls
• Ran multi-node latency benchmarks that correct for coordinated omission, covering scenarios like mixed workloads under replication failover
• Provided support and technical guidance to customers, rolled out new features to terabyte-sized
clusters
• Investigated incidents such as data discrepancies under replication failover, crashes, OOMs and deadlocks
Agents & MCP• Investigated incidents such as data discrepancies under replication failover, crashes, OOMs and deadlocks
• Developed MCP server for safe access to production observability and control plane data, optimized
friendliness for LLMs (context savings, grouping, summaries)
• Created agents for problem root cause recognition and automatic incident investigation
Company• Created agents for problem root cause recognition and automatic incident investigation
• Contributed to quarterly roadmap planning: scoping and prioritizing core features and projects
• Wrote technical blog posts on transactions, search, SSD data tiering and Lua scripting
• Wrote technical blog posts on transactions, search, SSD data tiering and Lua scripting
Software Engineering Intern at Yandex
May - September 2021
Yandex.Maps team responsible for public transport navigation
• Implemented C++ MapReduce algorithms for distance calculations running on millions of objects
• Implemented algorithms for bus route change detection and route estimation
• Implemented algorithms for bus route change detection and route estimation
Education:
Belarusian State University, Minsk, Bachelor of Science in Informatics and Applied Mathematics 2020-2024
Awards:
• Belarus National Olympiad in Informatics, 2nd-degree diploma (2019, 2020)
• Russia Open High School Team Programming Contest (VKOSHP), 3rd-degree diploma (2018, 2019)
• Regional Intel ISEF qualification award for a VR app (2018)
• Russia Open High School Team Programming Contest (VKOSHP), 3rd-degree diploma (2018, 2019)
• Regional Intel ISEF qualification award for a VR app (2018)
Occasional open source contributions (Before AI!)
2022
• Made my own two Go small libraries:
Redis streams-to-channels
and a universal struct mapper
• Wrote a small article about ray-tracing with Rust
• Hand optimized x86 compiler builtins (memcpy and memset) for wazero
- a wasm runtime
• Added a cache size limiter with automatic eviction to Fiber
• Implemented asynchronous shader compilation for Magnum
- a C++ graphics library
• Added optimistic locking and embedded structs to Rel
- a Go ORM
and a universal struct mapper
• Wrote a small article about ray-tracing with Rust
• Hand optimized x86 compiler builtins (memcpy and memset) for wazero
- a wasm runtime
• Added a cache size limiter with automatic eviction to Fiber
• Implemented asynchronous shader compilation for Magnum
- a C++ graphics library
• Added optimistic locking and embedded structs to Rel
- a Go ORM
Other:
Proficient in English, German (lived there)