Dennis _. Email & Phone Number

Kirkland, Wa, Us

Remote First, Us

Re-build RAFT mathcing engine cluster

Remote First, Us

- Maintain over 30 different blockchain protocols, perfomed upgrades, automated routine processs and remote actions.- The disorganized nature of protocol upgrades was a significant hurdle. Updates occurred unexpectedly, making tracking difficult. I designed and implemented a system that automatically monitors GitHub releases and generates Jira tickets, ensuring all upgrades are documented. This solution reduced the time spent tracking updates by 50%(todo: how to get this number?) and significantly increased process transparency. To bridge the communication gap between Discord and our corporate environment, I developed a bot that automatically analyzes messages in Discord and creates corresponding tasks in Jira, leveraging GPT-4o and cb-gpt. This integration has already resulted in considerable time savings and will reduce missed upgrades by 70% (todo: how to get thin number?). As part of this effort, a langchain’s CbGptChatModel NPM package was developed and could be re-used by other teams at Coinbase.- Unexpected data growth posed a threat to system stability due to potential overflows and failures. I created an automated action that generates a Pull Request to resize Persistent Volume Claims (PVCs), triggered directly from PagerDuty. This solution reduces response times to critical situations from several hours to mere minutes, ensuring uninterrupted service operations. My efforts contributed to the stability of numerous protocols, including Solana, Cosmos, Neutron, Stride, Axelar, dYdX, and Polka-dot. During emergency updates I promptly implemented necessary measures, preventing potential outages and ensuring system reliability and sustainability.- Investigated and fixed various issues in the test environment, decreased the protocol maintenance burden, increased the new release delivery speed.- Researched and enabled Solana SW-QOS as most-wanted feature of our Solana customers.

Remote First, Us

The Coinbase Staking API provides developers with programmatic access to Coinbase's staking infrastructure, enabling them to integrate staking capabilities into their applications seamlessly. As a Software Engineer at Coinbase, I played a pivotal role in the development and enhancement of our blockchain staking services. My primary focus was on designing and developing RESTful APIs using Golang, which became the backbone for our staking platform.

Remote First, Us

As a Blockchain Engineer on Coinbase's Query and Transact team, I specialized in managing and optimizing Ethereum nodes to ensure reliable and efficient RPC (Remote Procedure Call) services for customers. My role involved running and maintaining Ethereum nodes, enhancing the blockchain infrastructure to deliver high-performance API endpoints.Key Responsibilities:Node Management: Deployed and managed Ethereum nodes, ensuring they were optimized for high availability and performance.RPC API Development: Developed and maintained RPC APIs, enabling seamless integration of Ethereum blockchain functionalities with customer applications.Performance Tuning: Implemented performance tuning techniques to enhance node response times and reliability.Monitoring and Troubleshooting: Set up comprehensive monitoring to detect and resolve issues promptly, ensuring uninterrupted node operations.Customer Support: Provided technical support to end-users, addressing their RPC-related queries and ensuring a smooth user experience.Technologies Used:Blockchain Protocols: EthereumProgramming Languages: GolangDatabases: MongoDBTools: Grafana, Prometheus, AWS, Jira, PagerDutyAchievements:Optimized Ethereum nodes to handle high RPC request loads, significantly reducing latency and improving customer satisfaction.Successfully maintained high availability of RPC services, ensuring minimal downtime and consistent performance for end-users.Enhanced the monitoring and alerting systems, leading to quicker issue detection and resolution.My tenure at Coinbase allowed me to deepen my expertise in blockchain technology, particularly in managing robust Ethereum nodes and delivering high-quality RPC services. This role refined my problem-solving and technical skills, contributing to the reliability and efficiency of Coinbase's blockchain infrastructure.

Redwood City, California, Us

One of the first engineers. Worked on and Contributed to- Core cross-platform library for Enterprise Zero-Trust remote network access: C99, C++17, Python, Berkley sockets, libevent, openssl, JWT, lwip user-space stack, proprietary VPN protocol, Valgrind, perf.- Relay server and signaling services for peer-to-peer communication: Golang.- Client Node - Linux client applicatoin: C++, Python, systemd.service.- Access Node - Proxy server with permissions enforcement: Rust,C++, systemd.service, Docker, AWS AMI.- Continuous Integration and Continuous Deployment systems: Python, CircleCI, bash.- Sentinel (f.k.a Netsandbox) - functional tests framework, unit tests: LXD Linux Containers, Docker, Python, pytest, bash, Linux network namespaces, apache benchmarking, iperf.- Package and publish to a Linux packages repo: DEB, RPM, PKG.TAR.XZ.- Publish, test and delivery Docker images with the Access Node on board.- Publish, test and delivery: AWS AMI images with the Access Node on board.- systemd.service security hardening: systemd-analyze security.- Software Engineer Interview process.

Boston, Massachusetts, Us

Worked on and Contributed to:- Catapult Hydra (VPN Protocol library): C99, openssl, libevent.- Technical specifications, class diagrams, components diagrams, sequence diagrams. - Cross-platform library for Enterprise and Person Zero-Trust Software-Defined Peer-to-Peer networking. Work on prototypes of the edge-agent for Linux, Windows, Embedded Linux, Android, macOS, iOS.- Relay, Signaling high-load microservices: GoLang.- Functional test framework system based on pytest. To set up the environment I used Linux Inetwork namespaces, veth and bridge interfaces, dnsmasq, ftpd, nginx, smb, nmb, and develped microservices.- CI pipeline in Jenkins BlueOcean: static analysis (clang scan-build), build, test, publish to the Microsoft AppCenter, GitHub releases, GCP/S3 storage. Deploy/support server-side services on the cloud. Wrote automated functional tests framework based on pytest with Linux Network Namespaces isolation for different network emulation.- QA education sessions, looking for educational materials, courses in the fields of Basic Computer Science, Networking, Operation Systems, Scripting, Profiling.

Designed and developed C++ system smart-contract for CyberWay blockchain: C++, WebAssembly, eos.io API

San Francisco, California, Us

Worked on and Contributed to:- Cross-platform BitTorrent Sync client development. Develop transport encryption using OpenSSL. Network programming (Berkly sockets, epool, kqueue, Windows API). High-level messages protocol development. Support client on Linux x86, x86_64, armv4, armv7: С\C++, OpenSSL, POSIX, ed25519, google breakpad, Valgrind, system IO.- uTP2 transport protocol research, design, development.- Automatize cross-platform distributed functional client testing: Python3.5, RPyC, Jenkins.- Web-Service backend development: nodejs, C++ + NaN- Profiling\optimizing nodejs service: Linux perf and flamegraphs.- CI/CD setup: Jenkins.- Build and deliver packages for building standalone nodejs server for Windows (msi package, wix toolset) and Linux.

Minsk, By

Worked on and Contributed to:- Develop web-based UI for Users\Customers. Used technologies: PHP, Apache, MySQL.- Routine automation: Python and Bash. - Administrate Linux and Windows servers.- Support network infrastructure 24/7.

Essen, De

Worked on and Contributed to- Develop network equipment management services based on TR-69: C, Python.- Port OpenWRT to a new platform.- Android offlien speech recognition with PocketSphinx Open Source Project: C99, Java, NDK.- Bugfix and patch open-source userspace C++ software for embedded devices.- Develop and fix Linux kernel modules/drivers for embedded devices.- System user space software development.- Develop an Android application, mostly business logic: Java, Android Studio.- Native Android applications development: Android SDK, NDK, Java.- Porting a new version of Android to the new ARM platform: C99, C++, Java.- Adaptation of SPI Flash kernel module: C99.

Master'S Degree In Computer Science, Computer Science And Computer Tec

Specialist Degree In Systems Engineering, Computer Science