# Dmytro Koval

> Software Engineer at Snowflake

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/dmytrokoval

Design and build data processing systems and services.

Co-author of patents: US20220138260A1, US20210173855A1, US20200286391A1, US20200286388A1 / EP3705849A3, US20210012669A1
 / EP3764062A1

## Work Experience
### Staff Software Engineer @ Snowflake
Jan 2022 – Present | Menlo Park, CA
Distributed Systems Scaling: Designed and leading the team building a new distributed service to optimize and scale critical segments of query compilation and execution for petabyte-scale workloads.

Vectorized Expression Evaluation Frameowrk: Designed, implemented, and rolled out a new vectorized engine for expression evaluation, providing a high-level API that automates low-level vectorization and hardware optimizations for end-users.

High-Performance Data Representation: Led the Data Types team in designing a next-generation in-memory format for structured and semi-structured data, resulting in 10x–100x performance gains through optimized memory layout and vectorized compute.

Open Source & Standards: Represented Snowflake in the Apache Iceberg community to design the V3 Geometry and Geography specifications, while leading the internal team that implemented and shipped these types within the Snowflake engine.

### Senior Principal Architect @ HERE Technologies
Jan 2021 – Jan 2022 | Berlin, Germany
Data Lake with the focus on Geospatial data processing and analytics

Metadata management system collecting metadata from multiple data repositories

Data catalog and Data Discovery tools

### Principal Architect @ HERE Technologies
Jan 2018 – Jan 2021 | Berlin Area, Germany

### Lead Software Engineer @ HERE Technologies
Jan 2016 – Jan 2018 | Berlin Metropolitan Area
Tech Lead of Geospatial data ingestion engine applying spatial indexing on the fly, dynamically tailored to visualization workloads.

### Software engineer @ Triposo
Jan 2012 – Jan 2016 | Berlin Metropolitan Area
High-Scale Graph Processing: Built a dynamic routing engine that transformed raw geospatial data into a navigable pedestrian graph using custom Map-Reduce jobs.

Heuristic Ranking Models: Designed a multi-signal ranking system to score walking tours, integrating geospatial constraints with metadata (e.g., photo density) to optimize for "scenic" paths.

Latency-Critical APIs: Implemented optimized TSP solvers (Branch and Bound) and A* search variants to provide real-time, location-aware route generation via public-facing APIs.

Impact: Engineered the "City Walks" system, recognized for innovation in Apple’s iPad marketing campaign.

### Software Architect @ SAP
Jan 2008 – Jan 2012


## Education
### Master's Degree in Computer Science
Donetsk State Institute of Artificial Intelligence


## Contact & Social
- LinkedIn: https://linkedin.com/in/dimakoval
- GitHub: https://github.com/dmitrykoval

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Source: https://flows.cv/dmytrokoval
JSON Resume: https://flows.cv/dmytrokoval/resume.json
Last updated: 2026-04-12