William Janssen Email & Phone Number

• Built and scaled high-performing teams (35+ reports/60+ total members) responsible for the primary revenue-driving product application, API services, and supporting infrastructure platform to enable >200% growth in.
• Manage and empower a group of 8+ direct reports comprised of both people leaders (Engineering Managers) and Individual Contributors (Staff Engineers), helping set career goals and developmental plans.
• Responsible for department budget and resourcing in the larger organizational Annual Operating Plan, with monthly, metric-based summaries to the exec team on progress towards committed initiatives.
• Oversaw third-party vendor contracts needed by the department, including negotiations leading to ~10% annual cost reduction overall.
• Led migration away from legacy NodeJS API services to a modern Graph backed by Kafka, reducing p99 latencies globally by ~100% and total average error rates by >50%.
• Formalized and expanded the production support engineer role and software within the organization, reducing hours spent per ticket by 33% in 2023 and a 10% decrease in tickets month to month.

• Responsible for maintaining primary user-facing product application and supporting services that served 2m+ businesses and ~30k MAU.
• Developed technical and product strategy for migration away from the legacy AngularJS product, leading to an on-time delivery for MVP pilot group release in a modern, scalable tech stack powered by React.
• Successfully migrated >97% of the active user base to the new product application over a 1.5-year time frame via targeted customer segment release strategies while balancing legacy feature parity and new product.
• Created a new Tier 1 support role to reduce the operational burden on the engineering team by ~50%.

Kansas City, Missouri Area

• Responsible for building and maintaining the proprietary software applications and infrastructure critical for the business to function.
• Helped introduce and refine the agile process to the development teams to better plan and manage the software lifecycle.
• Shared responsibility leading the effort to reverse engineer a proprietary, multi-faceted 30-year-old enterprise Pascal application and rewrite it in a modern technology stack and tooling.
• Refactored a node application architecture away from an OO monolith into a more developer-friendly, modular pattern that saved time and effort with developer onboarding and churn on recurring tasks.

Kansas City, Missouri Area

• Consulting architect on multiple client workstreams, providing POVs for architecture decisions and recommendations with reference documentation.
• Launching the pilot of an owner rewards program for a Fortune 500 automaker.
• Work with client business stakeholders and internal teams to define requirements for projects and provide estimates for the level of effort on high-level milestones.
• Part of a team to help foster quality code craftsmanship and ownership via discussion and shared knowledge company-wide.

Kansas City, Missouri Area

- Built custom API for enterprise media distribution platform, and enabledclient to merge two large, legacy applications into one system, saving time andmoney and simplifying workflow.- Migrated 10 years of legacy data and assets into the new application.- In charge of schema rewrite, background processes, and test suite, as well asexposing the new.

Tempe, AZ

Tempe, AZ