Improving reliability of Adyen payment platform with SRE practices

• Managed infrastructure integrations with APAC banking and financial partners to ensure Stripe can reliably move money, and Stripe merchants can receive payouts successfully• Automated and drove down manual operational toil through code fixes and process enhancements in collaboration with banking partners• Led integration project with Citi New Zealand, oversaw end-to-end development, testing and rollout with the help of engineering; when project was disrupted by business priority change, ensured smooth handover by supporting new engineering team with knowledge sharing, pairing and writing operational • Fixed a bug in Stripe SFTP library causing failure to download files from mailbox-type SFTP server, avoiding a 4-week delay for UAT certification during integration with DBS Singapore • Implemented automatic fuzzy matching to improve payout return reconciliation in AUNZ, reducing number of cases requiring manual intervention• Proposed and built dashboard to track operational metrics of banking partners; collaborate with Partnership to define SLOs with banking partners to reduce number of partner-inflicted incidents, and improve communication • Built automatic ingestion pipeline for new financial report formats from banking partners, remove the need for Treasury team to use online banking portals to monitor Stripe liquidity

• Engaged with external partner NAPAS to migrate Visa traffic for Vietnam domestic transaction processing requirement, from implementation to testing and production operations• Eliminated manual private key management and long request form filling for TLS server certificate requests, by creating Python program to connect to PKI Certificate team’s REST API • Automated server NTP configuration change on 3000+ servers using Python, cutting down manual work • Managed multiple simultaneous projects for remote installation, configuration and decommission of Linux (RHEL) endpoint servers at Visa clients • Collaborated with external vendors and multiple cross functional teams (business, network, client support) for endpoint server setup and maintenance, enabling Visa clients to connect to VisaNet for transaction processing• Troubleshooted TCP/IP, FTP/S, IPSEC IKE, TLS/SSL, PKI X.509 certificate issues, often with client-facing focus • Automated manual login on multiple servers for collecting statuses, by implementing a Python multiprocessing program• Introduced Git and Bitbucket to team for version control of automation scripts• Created Jenkins job for automatic deployment from Bitbucket repo to servers upon code merging to mainline branch• Conducted functional testing of new OS version before production roll-out, and collaborate with Dev and QA for defects reporting and solution• Managed Requests, Incidents, Changes using ServiceNow platform• Participated in on-call 24x7 rotation

• Managed remote installation, configuration and decommission of 2000+ HPE Proliant servers running RHEL worldwide• Implemented configuration change and migrated all 90 servers in Indonesia to Open VisaNet for in-country processing without causing impact to Visa clients • Improved SharePoint automated workflows to reduce manual management of project rollout• Performed OS staging and physical server mounting for internal clients at Visa Data Center

• Utilized SharePoint list and workflow to automate project tracking process• Facilitated as-is process's reviews and to-be process's improvements in performance• Conducted training and provided support for engineers on usage of new tracking platform• Cooperated with other departments’ interns and won second place for devising a security awareness campaign in Visa Intern Case Challenge

• Coached new hire on using MEEN stack (MySQL/MongoDB - Ember.js - Express.js - Node.js) for faster learning of new skills, in order to aid development process• Integrated web services from Paypal, Facebook and Amazon Web Services for developing responsive mobile and web applications

• Pioneered in using MEEN stack (MySQL/MongoDB - Ember.js - Express.js - Node.js) for faster development of scalable web applications • Applied knowledge of Agile Software Development in project management for better client feedback and quality control

• Answered enquiries and questions of students during class exercises and outside class to help with the students’ understanding of the course, which reduced failure rate by 4%• Guided and provided feedbacks on students’ coding homework in order to familiarize the students with standard coding style, as well as problem-solving skill