Sergey Gubanov Email and Phone Number

Designed and developed distributed testing & tracing platform used by 50+ on-boarded payment systems.Achievements * Enabled productions scale tracing for more than 100 millions transactions per day by implementing query engine doing automatic re-writes of select queries to use batching * Offered client app teams with comparison solution producing diffs for a millions items in a minutes by designing and implementing Lucene based Comparison Service * Introduced support for streaming datasources (Kafka, IBM MQ) in the tracing engine by designing and implementing Indexer Service backed by Postgres DB * Automated CI/CD activities by installing and configuring Jenkins + implementing and supporting Jenkins/GitHub actions jobs * Received Recognition Award for outstanding individual contribution to the bank’s business and strategy.Technologies * Backend: Java 17, Kotlin, Groovy, Gradle, Spring, MyBatis, Postgres, Kafka, Lucene, Docker, Jenkins, Terraform, GitHub Actions, GCP GKE (Kubernetes), GCP Cloud Storage * Frontend: TypeScript, Angular 11

Developed and supported distributed busyness critical payments processing engine, handling 20 million transactions per month.Achievements * Migrated 50K+ configuration properties from multiple environments scattered across different files into a single easy to use and maintain configuration service based on HOCON * Severely increased stability of the system by introducing "smart" switch service supporting automatic detection of failures causing fallback to old logic or switch-off depending on configuration * Improved deploy stability by extracting all DB objects source code using developed Pl/SQL script and implementing Liquibase based migration tool supporting automatic rollback (downgrade) to deploy older versions * Decommissioned various legacy in-house distributed components by designing and developing new modern alternatives: throttling service, job scheduler, lock, etc * Unblocked on-boarding of new high volume customers by improving performance up to several times by optimizing DB schema and DB access in code * Twice received Recognition Award for outstanding individual contribution to the bank’s business and strategy.Technologies * Backend: Java 8, Groovy, Maven/Gradle, Spring, MyBatis, Oracle DB, PL/SQL, IBM MQ, Weblogic, Docker, Jenkins, TeamCity

s112 projectDesigned and developed 112 (911) call center system. Achievements * Improved system stability by designing and implementing persistent retry mechanism guaranteeing at least once delivery * Introduced core functionality Operator Dialogue Tree allowing declarative configuration of predefined Q&A tree Technologies * Backend: Java 8, Groovy, Maven, Spring, Hibernate, Oracle DB, MS SQL, Active MQ, Tomcat, Avaya * Frontend: GWT, Sencha GXT (ExtGWT)WageMan projectSummary: Designed and developed in-house employee compensation management system.Achievements * Led team of two to successful delivery of fully functioning first version of the product * Designed sophisticated permission model to comply with internal business flows related to compensation management * Designed and implemented Impersonation Engine, allowing users having various roles in the system to have a view corresponding to one of their roles Technologies * Backend: Java 8, Gradle, Spring, EclipseLink, Oracle DB, Tomcat * Frontend: JavaScript, Angular 1TOR projectSummary: Designed and developed backend for police office frontend systems.Achievements * Led team of 5 to deliver reporting engine and various regulatory reports * Designed and implemented SQL execution engine taking query JSON as parameter, running all security checks according to permission model, converting it to SQL and executing it in DB sending back the results * Automated CI/CD activities by installing and configuring SonarQube + implementing TeamCity jobs Technologies * Backend: Java 8, Gradle, Spring, JDBC, Oracle DB, Tomcat, Python