Ryan Dielhenn - Software Engineer M.S. Computer Science Student

portfolio@ryandielhenn:~$

portfolio@ryandielhenn:~/experience$

Experience

My professional journey in software engineering and distributed systems.

Software Engineer

↗ View Pull Requests to Kafka

Jan 2021 – Aug 2022

Confluent

Contributed to Apache Kafka's migration from ZooKeeper to KRaft, improving observability and reliability of the distributed consensus layer in Java/Scala.
Built metrics pipelines in Java/Scala to monitor cluster health, quorum state, and inter-broker communication patterns for KRaft; updated Confluent Cloud tooling in Go to integrate new metrics.
Contributed to Confluent Cloud's Cluster Linking integration with KRaft architecture for cross-cluster replication.

Software Engineering Intern

↗ View Pull Requests to Kafka

May 2020 – Aug 2020

Confluent

Implemented dynamic client reconfiguration in Java/Scala for Apache Kafka, enabling runtime updates to producer/consumer settings (including connection, security, retry, and ack configurations) without service restarts.
Enhanced Confluent Cloud's rebalance tooling with asynchronous replica movement support.
Continued contributing to Apache Kafka during Fall 2020 while completing undergraduate degree.

Undergraduate Researcher

Jan 2020 – Dec 2020

Big Data Lab - University of San Francisco

Developed a C implementation of Geopresence, a bitmap-based geospatial indexing system, using RoaringBitmap compression and HyperLogLog++ for efficient location queries on IoT devices.
Implemented C-based adaptive grid index achieving 17x speedup over Java; outperformed R-tree indexing by 400x at scale (1M+ points) while R-trees showed advantages on sparse datasets (<7K points).

Teaching Assistant — Big Data & Operating Systems

Aug 2019 – May 2020

University of San Francisco

Designed projects and coursework, reviewed student code weekly, and provided feedback with grades.
Held weekly office hours to guide students through project design and debugging.

Assistant Systems Administrator

May 2019 – Aug 2019

University of San Francisco

Supported the CS department by updating, patching, and maintaining Linux lab machines, improving system stability for students and faculty.

portfolio@ryandielhenn:~/projects$

Projects

A collection of my work in distributed systems, data science, and software engineering.

SlateDB - Open Source Embedded Key-Value Store

↗ View Pull Requests to SlateDB

Feb. 2026 – Present

Designed and implemented distributed compaction for SlateDB (Rust, LSM‑tree on object storage), enabling parallel compaction across multiple workers to address a single‑compactor throughput bottleneck; core implementation merged to main.
Authored the RFC proposing distributed compaction for SlateDB, enabling parallelization of independent compaction jobs between remote workers.

RustDatabasesKey-Value StoreAPI DesignObject Storage

Zephyr - Distributed Cache with Pluggable Membership Service

July 2025 – May 2026

Built a distributed cache in Go with consistent hashing for routing, key replication for availability, and a pluggable membership service.
Configurable between an etcd lease protocol and SWIM-based gossip protocol for node discovery and failure detection.

GoDistributed SystemsConsistent HashingGossip ProtocoletcdDockerPrometheusGrafana

OpenData - Open Source Object Storage Databases

↗ View Pull Requests to OpenData

Feb. 2026 – March 2026

Added the Prometheus /federate endpoint, the Prometheus /metadata endpoint, and support for PromQL scalar arguments in the timeseries database.
Established a nightly regression benchmark to identify performance regressions in the timeseries database.

RustDatabasesTime SeriesPrometheusBenchmarking

EDA Dashboard - High-Performance Data Exploration Tool

Aug. 2025 – Dec. 2025

An interactive EDA dashboard with FastAPI and DuckDB for browser-based analysis of million-row datasets with sub-second query performance.
Implemented bias detection and fairness analysis to identify discriminatory patterns across demographic groups and data drift detection to flag distribution shifts.
Uses DuckDB to enable fast and memory efficient analytical queries on datasets with millions of rows.

PythonFastAPIDuckDBData AnalysisCachingData Visualization

GeoPresence - High-Performance Geospatial Index for IoT

Jan. 2020 – Dec. 2020

A bitmap-based geospatial indexing system designed for IoT and low-power devices using RoaringBitmap compression and HyperLogLog++ for efficient location queries.
Developed during undergraduate research at University of San Francisco (January 2020 - December 2020).
Implemented a C-based adaptive grid index that achieved 17x speedup over the Java implementation and outperformed traditional R-tree indexing by 400x at scale (1M+ points), while R-trees showed advantages on sparse datasets (<7K points).
Features probabilistic point density estimation and adaptive grid resolution optimized for edge computing environments.

CC++JavaGeospatial ComputingIoTRoaring BitmapsHyperLogLog++Edge ComputingSpatial Indexing

DFS - Distributed Filesystem

Sept. 2019 – Oct. 2019

A distributed filesystem built with Java, Netty, and Protocol Buffers.
Features a controller-based architecture that routes client requests to storage nodes using Bloom filters to minimize unnecessary lookups.
Implements data chunking across storage nodes with replication for fault tolerance and availability.

JavaNettyProtocol BuffersBloom FiltersDistributed Systems

Fire-Engine - Multithreaded Search Engine

Jan. 2019 – April 2019

A multithreaded search engine that tracks user queries, enables web crawling, and supports search over an inverted index built from the crawled pages.

JavaMultithreadingInverted IndexWeb CrawlingJetty

itsh - Command Line Shell

Feb. 2019 – March 2019

A command line shell built in C with support for scripts, heredocs, pipes, redirection, background jobs, command history with bang reruns, and built-in commands like cd and setenv.
Features arrow key navigation through history and input editing.

CSystems ProgrammingShell ImplementationProcess ManagementSignal HandlingPipesRedirection

About

Skills & Technologies

Experience

Software Engineer

Confluent

Software Engineering Intern

Confluent

Undergraduate Researcher

Big Data Lab - University of San Francisco

Teaching Assistant — Big Data & Operating Systems

University of San Francisco

Assistant Systems Administrator

University of San Francisco

Projects

SlateDB - Open Source Embedded Key-Value Store

Zephyr - Distributed Cache with Pluggable Membership Service

OpenData - Open Source Object Storage Databases

EDA Dashboard - High-Performance Data Exploration Tool

GeoPresence - High-Performance Geospatial Index for IoT

DFS - Distributed Filesystem

Fire-Engine - Multithreaded Search Engine

itsh - Command Line Shell

Education

M.S. Computer Science

California State University, Los Angeles

B.S. Computer Science

University of San Francisco

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