Abbas Sharifitabar

• Designed and operated a Java/Kotlin Spring Boot payment orchestration service for multi-service transaction flows (Hexagonal Architecture, REST callbacks, domain events) on Kubernetes/AWS.
• Drove design, implementation, and phased rollout of smart routing across PSPs, using country-level success rates to guide routing decisions.
• Contributed to the architecture and developed the backend for CaaS (Configuration as a Service), a dynamic platform enabling microservices to define custom business schemas. Integrated with Spring Cloud Config to serve configuration data, gradually replacing legacy fixed-format business contracts.
• Led the reconciliation RFC and cross-team implementation to align internal transaction states with external PSP settlement reports, significantly improving financial data accuracy. Additionally, reviewed designs and pull requests to enforce reliability and maintainability across services.

Delivery Hero initiatives →

• Contributed to developing and optimizing Apache Flink and Hive batch processing jobs on Kubernetes to generate pre-calculated datasets from a large-scale data lake. These pipelines powered core products like ad-targeting, publisher solutions, and user feature extraction, directly driving company monetization.
• Contributed to preparing publication and user datasets for daily Solr index rebuilds and switchover, covering approximately 20M users and over 200M publications.
• Developed and maintained critical microservices serving as the robust backend for the data lake's service layer. Participated in the migration of these backend services and job flows to Google Cloud Platform (GCP) to leverage its scalable infrastructure.

• Developed a Java blockchain solution for searching and swapping smart contracts.
• Evaluated a proof-of-concept for high-volume log processing using Apache Kafka.

• Led a team of 7 on a Java/Spring Boot low-code BPMS platform end-to-end; mentored engineers on design and code quality.
• Delivered Flowable/BPMN workflows, Keycloak IAM, microservices integrations, and a data layer over PostgreSQL/Oracle.

• Contributed to building a Java/Spring Boot data-ingestion framework (Kafka, Parquet, HBase) processing up to 3M events/sec.
• Delivered ETL pipelines, a visualization/serving layer, and ELK/Zabbix monitoring for the big-data platform.
• Provisioned infrastructure with Ansible, Docker, and Rancher.

• Built Java/Spring Boot backend services and SDKs with REST APIs for search, push, and user management.
• Owned the Solr search implementation for an Android app marketplace serving approximately 7M users with 80K apps; built scheduled database-to-index pipelines for app names, descriptions, and available comments.
• Load-tested search using simulated user queries, supported A/B testing during rollout, and monitored production Solr performance.
• Designed an early PaaS foundation for an omnichannel BPMS later continued at Raya Navid Systems.