Sinisha Stanchev, Developer in Skopje, Macedonia
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Sinisha Stanchev

Verified Expert  in Engineering

Software Developer

Skopje, Macedonia
Toptal Member Since
May 19, 2022

Sinisha is a data engineer, senior PL/SQL developer, and Oracle database administrator with over 17 years of experience developing and maintaining complex applications on an international platform. He has contributed to multi-million software development programs. Sinisha has excellent analytical and problem-solving skills. He easily interacts with business users to ensure specific and critical business requirements are achieved. Sinisha will be a great asset to any team.


Oracle PL/SQL, Data Pipelines, Oracle DBA, Business Analysis, Jira...
Oracle 12c, Oracle, Oracle WebLogic Application Server, Java, Oracle PL/SQL...




Preferred Environment

Oracle, Python 3, Apache Airflow, Docker Compose, PostgreSQL, MariaDB, MySQL, Oracle PL/SQL, Talend, Oracle SQL Developer, Snowflake, Amazon Web Services (AWS), NoSQL

The most amazing...

...applications I've developed are a blood banking app used by the biggest blood banking companies worldwide and a CRM app used by Macedonian telecom companies.

Work Experience

Data Engineer | Senior PL/SQL Developer | Oracle Database Administrator

2014 - PRESENT
  • Developed a data migration tool to migrate data from old legacy systems to a CRM system.
  • Integrated the CRM system with other systems used by this telecommunication company.
  • Analyzed the performance of the Oracle production database and optimized the database level and SQL tuning.
  • Created reports based on requirements given by business users.
  • Tracked and fixed bugs using Jira and Redmine as reporting tools.
  • Built a database used by the CRM system for transactions and reporting.
Technologies: Oracle PL/SQL, Data Pipelines, Oracle DBA, Business Analysis, Jira, Data Migration, ETL Development, Database Design, Data Analysis, Oracle Performance Tuning, Data Integration, Reports, Bash Script, Oracle 12c, Oracle, MariaDB, Oracle Data Pump, Oracle SQL, Oracle RMAN, Tuning Advisory, Automatic Workload Repository (AWR), Eclipse, Git, Subversion (SVN), Jenkins, Redmine, Data Engineering, SQL, Data Modeling, Python 3, Apache Airflow, Oracle Database Architecture, Entity Relationships, Data Build Tool (dbt), Data Architecture, ELT, Real-time Data, Apache Kafka, Docker, Kubernetes

Senior PL/SQL Developer | Oracle Database Administrator | System Administrator

2005 - 2014
  • Developed a process for data migration and integration with other systems.
  • Developed Oracle PL/SQL packages, SQL tuning, and database performance tuning.
  • Created reports using iReport Designer for a healthcare application.
  • Developed a replication module using materialized views.
  • Created scripts for performance testing of the application using OpenSTA.
  • Built a platform-independent installer for the application using AntInstaller and Apache Ant.
  • Worked on performance stress testing on different operating system platforms, application servers, load balancers, and different versions of the Oracle database.
  • Installed, configured, and maintained application servers, such as Oracle WebLogic versions 9, 10g, 11g, and 12c, Apache Tomcat versions 5, 6, and 7, and IBM WebSphere versions 6.1, 7.0, and 8.5.
  • Maintained and monitored the system in real time, analyzing and resolving potential issues. Used IBM nmon, vmstat, iostat, top, JConsole, VisualVM, OEM, Oracle Automatic Workload Repository (AWR), and Oracle Statspack.
Technologies: Oracle 12c, Oracle, Oracle WebLogic Application Server, Java, Oracle PL/SQL, Oracle DBA, OEMs, Oracle Data Pump, Oracle SQL, Oracle SQL Developer, Bash Script, Eclipse, Apache2, Apache Tomcat, IBM WebSphere, Load Balancer ZEUS, iReport Designer, Subversion (SVN), Jenkins, Redmine, SQL, Oracle Database Architecture, Entity Relationships, Data Architecture

Customer Relationship Management (CRM) for Telecommunications

I worked on this CRM app's data migration, data integration, database development, and database administration. I also developed the end-user reports and maintained and tuned performance on the database level. Later, I participated in a data warehouse project as a CRM consultant.

Blood and Plasma Management Application

When I started working on this project, I oversaw the blood and plasma management software development using the Java Development Kit (JDK) versions 1.4 and 1.5, Eclipse as an integrated development environment (IDE), and iReport for designing reports.

I got promoted to a deployment engineer and database administrator in the following years. We used different application servers for deployment, such as Apache Tomcat, WebLogic, and WebSphere. I also worked on installing application servers, installing and configuring software and hardware load balancers using Apache Web Server, Zeus 6.0, and the Cisco content switch, and monitoring the application servers' Java virtual machine (JVM) using JConsole and VisualVM.

My next job title was a database administrator. I installed Oracle versions 10g, 11g, and 12c, configured materialized view replication, monitored the database instances using OEM, AWR, and Statspack, tuned database instances, optimized SQLs, and migrated data.

Finally, I also worked as a technical consultant in the last years, conducting specialized training for customers, employees, and organizations. Finally, I ran performance and stress testing of the application, providing the first-level support.
1999 - 2005

Bachelor's Degree in Electrical Engineering, Computer Science, Information, and Automation

Ss. Cyril and Methodius University in Skopje - Skopje, Macedonia




Apache Airflow, Docker Compose, Jira, Git, Subversion (SVN), Jenkins, Redmine, Apache Tomcat, iReport Designer


Database Design, ETL, Oracle Database Architecture, Automation


Oracle PL/SQL, Oracle SQL Developer, Data Pipelines, Data Integration, Oracle SQL, SQL Performance, SQL Stored Procedures, MariaDB, MySQL, Databases, Oracle DBA, Oracle 12c, Oracle 10g, Oracle 11g, PostgreSQL, NoSQL


SQL, Stored Procedure, Python 3, Bash Script, Java, Python, Snowflake


Oracle, Eclipse, Apache2, Apache Kafka, Docker, Kubernetes, Talend, IBM WebSphere, Amazon Web Services (AWS)


Programming, Data Migration, ETL Development, Oracle Performance Tuning, Reports, Oracle Data Pump, Data Engineering, Data Cleaning, Entity Relationships, ELT, Software Engineering, Business Analysis, Data Analysis, Automatic Workload Repository (AWR), Data Warehouse Design, WebLogic, Oracle OEM 12c, System Administration, Application Configuration, IT Consulting, Data Warehousing, Tuning Advisory, OEMs, Data Modeling, Data Build Tool (dbt), Data Architecture, Real-time Data, Oracle RMAN, Oracle WebLogic Application Server, Load Balancer ZEUS, App Support

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