Mark Sernoskie

• Mitigated an estimated $230,000+ in potential customer losses by diagnosing and stopping runaway compute and high-cost production incidents across 30+ teams.
• Cut $36,000+/month in operating costs by optimizing CRM sync workflows and data-warehouse pipelines, and building internal tooling that reduced reliance on premium HubSpot functionality.
• Supported 300+ agencies operating 450+ public and private applications through debugging, architecture review, and production issue resolution.
• Helped customer teams reduce cloud compute spend 45% through application and infrastructure optimization.
• Built a suite of internal full-stack apps (Gadget, React Router v7, Node.js, Redash): a customer geo-mapping and visibility tool for partnerships, a partner referral system, and a Customer.io pipeline-sync monitor with automated PagerDuty alerts.
• Built a data-intensive dynamic pricing calculator (Gadget, React, Node.js, Redash), reconciling 180+ fields across 900+ accounts and embedding it into the existing billing UI while enforcing tenant-level data isolation and keeping page renders fast under load.
• Led development of an internal support platform processing 800+ tickets monthly, with historical ticket matching, anomaly detection, and AI-assisted investigation; partnered with engineering, product, GTM, and partnerships teams to reduce repeat support load.
• Drove developer relations by authoring public docs and tutorials, developer-focused blog posts and video walkthroughs, and reusable app templates for 1,000+ users, helping developers scaffold and ship faster on the Gadget platform.

End-to-end platform that ingests support tickets via webhook and auto-drafts replies using a Claude agent that researches answers against the product codebase in ephemeral E2B sandboxes.

Closed-loop referral tracking that syncs partner attribution and payout data between the app, HubSpot, and Gadget's data warehouse.

HubSpot to Gadget platform used by GTM and Partnerships to analyze customer segments and partner accounts, with geo-tagging for regional planning.

Shipped two timed entries with 3 to 4 person teams, leading coordination and building gameplay, UI, and logic under deadline.

• Leaping Realities (Godot Wild Jam #80): placed 6th of 200.
• Pignition (Godot Wild Jam #78): placed 49th of 136.

B.S.

Certificate