David Joyner Email & Phone Number

Seattle, Wa, Us

San Jose, California, Us

Successfully transitioned Engineering responsibilities to a new leader and focused full-time on technical leadership in Spirent's CTO office.• Established an evolutionary HW/SW strategy with an emphasis on re-platforming and breaking custom hardware constraints that have previously kept the company’s most interesting technology locked up in the lab.• Decided and communicated the business’ technical approach to core / cloud convergence. Defined a product concept and system architecture for lab-to-live testing. Takes a loosely coupled services-based approach. Designed to support up to a million simultaneously active distributed test agents. Kubernetes-based SaaS, with Kafka, Avro, Beam, and Flink.• Managed a team of architects working on a variety of research and incubated “zero-to-one” projects.

San Jose, California, Us

In addition to ongoing technical responsibilities, took on the interim Engineering leadership role to help the business begin an organizational transformation. Rebalanced a lopsided organization and recruited three Engineering Directors to restore effective management. Drove culture change: customer focus, design thinking, and obsession with craft.• Fully met corporate revenue and profit objectives during a very challenging transitional period that was also hampered by global trade disruptions.• Continued previous technical work by architecting a re-platforming of the company’s flagship product, currently in progress. Leveraged lessons learned from SaaS deployments for on-prem product evolution.• Focused on organization development. Lead an internal training program aimed at developing system architects.• Filed “Effective correlation of multiple time-series result sets”, US Patent Application # 16/391,604.

San Jose, California, Us

Rejoined Spirent to define, develop, and deliver a SaaS architecture supporting new market initiatives. Launched as a publicly hosted production service within six months of specification. Led much software architecture work across multiple projects with substantial hands-on contributions.• Developed a Go-based web services micro-framework for internal use. Includes auto-generation of client and service code from OpenAPI specifications, distributed tracing, logging, content negotiation, API versioning, and extensible middleware. Rapidly adopted and used in over a dozen web services and product backends.• Architected a scalable system for product telemetry, used to assess on-prem install/upgrade activity, ongoing usage, and error/crash rates. Event ingest via REST API and Kinesis Firehose to S3 for long-term storage.• Developed a high-performance backend service for analytics, using PostgreSQL with R-OLAP schemas.• Developed a Haskell-based system for continuous data replication from Salesforce to PostgreSQL. Supports bulk and incremental data replication with robust error handling.• Established new practices around continuous delivery: Kubernetes-based build environments, automated acceptance testing, infrastructure as code, zero-touch configuration management via Salt, ELK log aggregation, Prometheus monitoring/alerting, Slack ChatOps integration, zero-downtime blue/green deployments.• Co-architected a unikernel-based system for simultaneous, accurate generation of CPU, memory access, storage and network workloads. Later open-sourced as OpenPerf.• Granted “Accurate generation of multiple dimensions of computer load”, US Patent # 9894150.

Round Rock, Texas, Us

Led the architecture and development of a next-generation security appliance for privileged password management in the Identity and Access Management (IAM) space. Focused development efforts on integrating multiple existing products into a hardened appliance format, modernizing API interfaces, enhancing high-availability features, and improving product quality. Established a distributed development environment to enable developers in three sites.• Work spanned multiple operating systems, technologies, and language environments: security-hardened Windows Server 2012 appliance, Linux distributed appliance, C#/.NET 4.5, MS SQL Server, Redis, REST, Protocol Buffers, ZeroMQ, gossip protocols, consensus protocols, and crypto.• Developed gossip-based state flooding protocol, database / file replication, and distributed control mechanisms for an existing appliance-based security product.• Modernized team's development environment including Git, Jenkins, multi-platform build/packaging, automated acceptance testing, and continuous deployment.

San Jose, California, Us

Returned to Spirent’s technical ladder of my own accord, driven by a love of creating products and solving hard problems. Primarily responsible for software protocol stack architecture.• Designed a patented mechanism for layering arbitrary protocols as virtual interfaces. Implemented dynamic packet classification for short-cut routing and L2/L3 VPNs, enabling scalability to millions of label-switched paths per port.• Developed a Python-based embedded framework that reduced development time by an order of magnitude.• Architected and developed an architecture for sharing a high-performance user-mode protocol stack amongstseparate test processes. Ported a subset of the FreeBSD kernel to this architecture.• Granted “Method and apparatus for emulating network devices”, US Patent # 8264972 and 9654303.

San Jose, California, Us

Took over Engineering leadership after the organization suffered layoffs in 2001. Initially focused on getting new products out the door for revenue, improving product quality, and returning to profitability.• Put management systems in place, established a uniform product development process, reallocated resources, and recruited talent to replace what was lost during downsizing.• Started organic development of a new product line to replace several legacy products that were near the end of their lifecycle.• Grew team of 150 to 300 across six Spirent sites.

San Jose, California, Us

Greenfield firmware development for three product families that delivered several hundred million dollars of revenue. Developed two complete embedded runtimes. Coding of everything from custom embedded BIOS to device drivers to protocol stacks.

Developed software and firmware for two Domino protocol analyzer products.