Ivan Fekete
Software Engineer at Google · Sunnyvale, California
I’m Ivan, a software engineer at Google based in Sunnyvale, California, working on AI infrastructure monitoring configuration. Previously, I built AR experiences, multiplayer infrastructure, and on-device machine learning at Snap and Amazon. I’m also an ICPC World Finalist, a problem setter, and a writer exploring the algorithms behind production systems. See more
At a glance
Named inventor on 3 Snap Inc. patents
AR, wearables, and multiplayer; filed in the US and internationally
20M Snap Multiplayer Infrastructure
Designed matchmaking for 20M DAU; boosted messaging throughput 40x on Spectacles; saved $250K in annual cloud costs
ML libraries 40% faster than alternatives
Embedded C++ and SIMD; shipped in Ring cameras with 1.5M combined sales
ICPC World Finalist
World Finals 2024; SEERC 2022 2nd place; two-time Ukrainian National Olympiads prizewinner
Judge & Problem Setter
Authored 15 problems for CodeChef, HackerRank and olympiads, judged hackathons and programming contests
Two articles on HackerNoon
Researching matchmaking queues and time-series database algorithms
Experience
Software Engineer, Google
Sunnyvale, California · Oct 2026 - Present
Working on AI infrastructure monitoring configuration at Google
- AI infrastructure
- Monitoring configuration
Software Engineer, Snap Inc.
Santa Monica, California · February 2024 – July 2026
Real-time multiplayer and AR infrastructure for Spectacles and Connected Lenses, a matchmaking service for 20M daily players, and the cloud platform behind them.
- Real-time systems
- Multiplayer infrastructure
- Distributed systems
- AWS
- Google Cloud
Software Development Engineer, Amazon
Amsterdam, Netherlands · November 2021 – November 2023
Machine learning libraries and computer vision for Ring devices, including motion detection shipped in cameras with 1.5M combined sales.
- Machine learning
- Computer vision
- Edge devices
- AWS
- Low-level optimizations
AR Engineer, Snap Ukraine
Odesa, Ukraine · August 2019 – November 2021
Original AR experiences and foundational AR templates for Snap Spectacles.
- Augmented reality
- 3D Math
- Computational geometry
Awards
ICPC (International Collegiate Programming Contest)·Luxor, Egypt
ICPC (International Collegiate Programming Contest)·Vinnytsia, Ukraine
Ukrainian Olympiad in Informatics
Patents
- US12151138B2 ·Granted·November 26, 2024
- US12569721B2 ·Granted·March 10, 2026
AR eyewear shows virtual targets and real-time indicators that respond to the wearer's movement, using the device's IMU and cameras to evaluate exercise form and performance.
- US20260080634A1 ·Pending
- WO2026060142A1 ·Pending
Lets users discover and join shared augmented reality experiences on nearby head-mounted devices through automatic wireless detection, removing manual setup.
- US20240050831A1·Pending
Electronic eyewear presents virtual instructor avatars for guided fitness demonstrations: a primary avatar at a fixed instructor position and a secondary avatar that stays visible from any body posture, so users can follow along while keeping proper form.
Writing
Block decomposition: how ClickHouse, Prometheus, and InfluxDB rediscovered the same fundamental algo
Three independent time-series database systems converged on sqrt-decomposition, partitioning data into blocks with summaries to speed up range queries, though each diverges from the theoretical model in practice.
Benchmarks data structures for game matchmaking and shows that Fenwick trees with bucket lists outperform skip lists by roughly 35x on queries while using 3x less memory.
Conference paper (in Ukrainian) on a plagiarism detection system that cuts the time to find similar texts by lowering the asymptotic complexity of a modified locality-sensitive hashing algorithm. Co-authored with Valeria Fekete, Yaroslav Obukhov, and Viktoriia Ruvinska.
Judging
Served as a judge at this 48-hour global virtual hackathon, evaluating production-ready prototypes across health, sustainability, and business tracks.
Judge, Ukrainian Olympiad in Informatics
Served as a judge for the final stage of the Ukrainian Olympiad in Informatics.
Problemsetting
CodeChef
Authored 10 problems across 5 CodeChef contests between 2017 and 2018. Every problem is credited on its contest page; the full list is on the CodeChef profile .
Authored the problem DLDAG , used in both divisions and credited on the contest page. It received 338 successful submissions out of 675 attempts in Div 1, and 352 out of 1,300 attempts in Div 2.
Sole problem setter of all six problems, as credited on the contest page: SPLST , FRCPRT , PRMDIV , GCDSUM , MKSTR , and MEXRNG . Across the six problems, Div 1 recorded 238 successful submissions and Div 2 recorded 1,935. CodeChef's official YouTube channel made a video based on one of the problems, Split Stones (SPLST).
Authored the problem PSHTRG , used in both divisions and credited on the contest page. It received 426 successful submissions out of 4,880 attempts in Div 1, and 308 out of 12,080 attempts in Div 2.
Authored the problem PSHTTR , credited on the contest page. It received 627 successful submissions out of 11,240 attempts.
Authored the problem PSHTBRTH , credited on the contest page. It received 499 successful submissions out of 3,440 attempts. A video editorial of the problem was published by a programming channel with 749K subscribers.
Ukrainian Olympiad in Informatics
Authored 4 problems across 3 contests between 2018 and 2019, spanning the olympiad's final stage and its IOI team selection rounds.
Final Stage 2019
Authored Day 2, Problem A of the olympiad's final stage in Odesa, which drew the best 129 competitive programmers nationwide.
IOI Team Selections 2018
Authored two problems for the selection rounds that formed Ukraine's IOI team.
Final Stage 2018
Co-authored Day 2, Problem D of the olympiad's final stage in Mykolaiv, which drew the best 129 competitive programmers nationwide.
HackerRank
Authored one problem for HackerRank's Weekly Challenges.