Hartanto Thio
Developer
© 2026 All rights reserved.
Resume
Experience
2025 - Present
VantaSenior Software Engineer
- Lead the end-to-end delivery to enable customers to tailor email and Slack content and send reminder emails from their own domains; coordinate product, design, and partner engineering teams while defining the technical plan and delivery sequence.
- Lead the design and delivery of a guided onboarding experience for configuring the Personnel Hub, from engineering specification, sequence implementation, and driving execution.
- Lead the Personnel team's workstream for a cross-team security initiative that centralizes authorization across GraphQL, REST, and agent-tool entry points.
- Lead development of agent tools that make Personnel workflows available to AI-driven experiences.
- Provide technical leadership and mentorship to a junior engineer, reviewing technical specifications, delegating scoped workstreams, and guiding implementation decisions.
- Serve as frontend lead for the team, collaborating with design-system and frontend-platform teams to align component patterns, UI standards, and implementation across product surfaces.
- Use AI-assisted workflows across technical planning, implementation, code review, and on-call support, including investigating production alerts, customer support questions, and product behavior questions.
- Participate in the engineering on-call rotation, using Datadog monitoring and alerting to investigate incidents and maintain product reliability.
2024 - 2025
RipplingSenior Frontend Engineer
- Led the rollout of a CMS-agnostic marketing web architecture that decoupled the website from WordPress and created a more flexible foundation for future development.
- Implemented Datadog and Sentry metrics, dashboards, and alerting, to enable proactive detection of website issues.
- Performed technical Search Engine Optimization (SEO) audits and implemented best practices metadata enhancement, site speed optimization, hreflang tag — resulted in improved search engine visibility and ranking for international sites.
- Migrated WordPress infrastructure to address traffic driven downtime, with zero downtime after the transition.
- Established release management process, on-call documentation, and incident response procedures.
2022 - Present
ZipSenior Software Engineer
- Led UI and performance improvements across payment experiences by adopting modern shared components and simplifying reuse for engineers outside the frontend specialty.
- Led the invoice attachment workflows, expanding support from a single email or file to multiple files and formats, improving support for real-world payment documentation.
- Partnered with Engineering, Product, Design, and QA from feature scoping through production release; supported customer issues and product stability through on-call ownership.
- Contributed to the broader frontend organization by mentoring non-frontend engineers, hosting office hours, documented best practices, and modernizing the shared core library.
2019 - 2022
ConfluentStaff Frontend Engineer / Tech Lead
- Led the migration from a monolithic WordPress application to Gatsby, a React-based framework, resulting in an over 45% improvement in page load time.
- Led the migration from WordPress to Contentful, including content migration, stakeholder training, and adoption across marketing teams.
- Delivered website localization across five languages using Smartling and partnered with marketers to establish repeatable localization workflows and processes.
- Joined as the first frontend hire and helped grow the team to six engineers, establishing an engineering culture in a Marketing organization.
- Owned Confluent's corporate website and Developer Hub, with additional support for the Apache Kafka website and Kafka Tutorials, serving both business and developer audiences.
- Supported company-wide brand redesign leading up to Confluent's IPO, implementing new typography, logo treatments, color systems, and complete redesigns of key landing pages.
- Implemented website tracking with Segment and BigQuery and integrated Optimizely to support data-informed experimentation and measurement; and partnered with growth marketers to build landing page variants for A/B testing using Optimizely.
- Built and maintained automated CI/CD with Netlify and Semaphore; added pull request performance reporting with WebPageTest, Core Web Vitals, and Lighthouse, plus automated testing with Jest and Cypress.
2017 - 2019
Yahoo SearchSoftware Engineer
- Led development of an internal Single Page Application (SPA) that enabled Engineering, Editorial, and Product teams to build search experiences end-to-end, from configuring backend data sources to rendering frontend components.
- Improved the efficiency of creating new experiences by over 50%, which led to faster turnaround time in delivering new product experiences for the consumers.
- Worked directly with users to collect, prioritize, and resolve feedback to further improve the user experience.
2016 - 2017
BeepiSenior Frontend Developer
- Delivered a new product design and migrated the tech stack from .NET and Angular to Node.js and React.
- Built reusable, configurable components and trained engineers to develop features with React and Redux.
2013 - 2016
Yahoo SearchFrontend Engineer
- Shipped experiments that contributed to quarterly revenue goals and helped launch a redesigned search experience across international markets.
- Improved delivery quality by integrating testing into the SearchFE platform, monitoring deployment pipelines, and helping introduce React to the application.
Education
2009
Texas A&M UniversityB.S. Computer Science
Industry Affiliates Program (IAP) scholarship recipient from 2007 - 2009
Skills
- JavaScript
- PHP
- HTML
- CSS
- Tailwind CSS
- Java
- React
- Redux
- MongoDB
- MySQL
- GraphQL
- Gatsby
- Next
- Remix
- Laravel
- Phalcon
- CodeIgniter
- jQuery