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Senior Software Engineer
Upwork (formerly Elance-oDesk)• June 2012 - September 2019
Architect and develop the entire backend for Escrow payments (now it’s used for Fixed-price jobs and for Membership/Connects payments). No-downtime migration of the existing user base (13.5M users) from old Perl code to new Java service. Primary areas: user management (registration, authentication, several password hashing algorithms), payment processing (PayPal, Merchant E-Solutions, Wellsfargo), batch-charge of all customers, charge reports. Support, bug fixing and extending existing Perl code. Migration of Perl code to Java.
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