Esteban Mallen

Author long-horizon software engineering evaluation tasks in real codebases where leading coding agents report success while the work is wrong, proven by execution-based trials with grading rubrics. Built a repeatable authoring pipeline with Claude Code and guardrails to keep confidential code away from unsanctioned models.

Authored architecture proposals and led cross-team migrations, including consolidating transactional messaging onto a single notifications platform. Redesigned signup flow with async deferred checks, cutting account creation latency by 50% and contributing to a 15% lift in user activation.

Architected and built from scratch a real-time security integration platform for Ring, enabling third-party rapid response companies to monitor and act on customers' motion events. Designed microservices on AWS ensuring sub-second event delivery for security-critical workflows.

Tech Lead for a 6-person Scrum team owning ISV marketplace integrations for Microsoft, Google, AWS, DocuSign, and Autodesk, through which 80% of company revenue flowed. Rescued and delivered multiple at-risk integrations and mentored mid-level and senior engineers.

Developed and maintained payment and recurring billing systems for online courses. Built and optimized storefronts and backend microservices, integrating multiple global and local payment gateways.

Developed online desktop applications and provided bug fixing and support for existing software solutions.

Developed RESTful web services and conducted QA testing, collaborating closely with frontend teams on API integration.