Ninko is available for hire

Ninko Kovachevich

Verified Expert in Engineering

Data Engineer and Software Developer

Location

Sofia, Bulgaria

Toptal Member Since

September 9, 2020

Ninko is a data solution architect with a background of over ten years in delivering data projects using various databases and data integration tools, as well as procedural programming languages and Python. He is proficient in developing data ingestion frameworks and has hands-on experience architecting data platforms and data warehouse systems. Ninko is determined, proactive, and capable of working in a fast-paced, dynamic environment.

Data Engineering Data Warehousing Data Warehouse Design SQL ETL Oracle Informatica PowerCenter Big Data Machine Learning Azure Data Lake Microsoft SQL Server T-SQL (Transact-SQL)Oracle PL/SQL Python Snowflake Informatica Cloud

Portfolio

EPAM Systems

Azure, Big Data, Python, Snowflake, Stonebranch, Informatica Cloud...

Adastra Bulgaria Ltd

Database Modeling, Data Warehouse Design, Data Warehousing...

DSM Engines LLC

SQL Server Integration Services (SSIS), T-SQL (Transact-SQL), C#...

Experience

SQL - 10 years Data Engineering - 10 years Data Warehousing - 8 years Microsoft SQL Server - 5 years Database Modeling - 5 years Oracle - 5 years Azure - 3 years Big Data - 3 years

Availability

Part-time

Preferred Environment

SQL, Microsoft SQL Server, Oracle, Big Data, Azure, Python, Snowflake, Databricks

The most amazing...

...project I have participated in is a real-time text messaging system, built for a telecom's marketing department, that affects thousands of people every day.

Work Experience

Data Solution Architect

2021 - 2023

EPAM Systems

Acted as the owner of the technical solution by designing the architecture and its components and supporting the actual development.
Led the development of a Data Lake by leveraging Azure services and Snowflake to ingest data from various data sources like flat files, RDBMS, and REST APIs.
Designed metadata-driven data pipelines to enhance reusability and configurability.
Built and maintained project documentation, including solution architecture documents, development guides, naming conventions, data cataloging templates, and onboarding guides.

Technologies: Azure, Big Data, Python, Snowflake, Stonebranch, Informatica Cloud, Data Architecture, Azure Databricks, Databricks

Senior DWH Consultant

2016 - 2021

Adastra Bulgaria Ltd

Acted as a BI solutions architect and delivered complete implementation design documentation based on business requirements.
Developed real-time processes with in-memory aggregation using Informatica PowerCenter.
Took part in the optimization of the database operations by defining indexes and partitioning schemes.
Took advantage of company training opportunities by completing big data, cloud, and other internal courses.

Technologies: Database Modeling, Data Warehouse Design, Data Warehousing, Oracle Business Intelligence Enterprise Edition 11g (OBIEE), Oracle PL/SQL, Oracle, Informatica PowerExchange, Informatica PowerCenter

BI/ETL Developer and Technical Lead

2015 - 2016

DSM Engines LLC

Designed and developed both relational and dimensional database models that would serve as a foundation of the company's projects.
Developed processes for ingesting various file sources, including parsers for non-structured files.
Took care of database maintenance such as backup scheduling.

Technologies: SQL Server Integration Services (SSIS), T-SQL (Transact-SQL), C#, SQL Server 2012

ETL Implementation Engineer

2011 - 2014

cVidya Networks

Worked on source data analysis by identifying data patterns, joining keys, enrichment, correlation, and filtration logic.
Developed file parsers for binary files and non-structured files such as invoices.
Wrote documentation such as low-level implementation details and user manuals.

Technologies: Oracle PL/SQL, T-SQL (Transact-SQL), SQL Server Analysis Services (SSAS), SQL Server Integration Services (SSIS), C#, Oracle, SQL Server 2008

Experience

Invoice Discrepancy Detection

A data matching platform in its core, the project deliverables included ETL, OLAP cubes, and reporting. As an ETL developer, I implemented SSIS packages and T-SQL procedures for loading the data, which included different file parser for each invoice type that the customer was receiving from its vendors.

Minimum Advertised Price Verification

To protect the minimum retail price of its products, the customer was web scraping retailers' data and provided it together with pricing catalogs. I was in charge of designing and implementing the appropriate data structure and ingestion processes, so the data can be easily used for reporting.

Real-time Text Messaging System

A system, consisting of several components, that sends marketing text messages to a telecom's clients. I contributed to the ETL part, which was responsible for scanning the CRM's operational database logs and catching certain events that would trigger a message.

Education

2020 - 2022

Master's Degree in Artificial Intelligence

Sofia University St. Kliment Ohridski - Sofia, Bulgaria

2012 - 2014

Master's Degree in IT Project Management

New Bulgarian University - Sofia, Bulgaria

2007 - 2012

Bachelor's Degree in Informatics

New Bulgarian University - Sofia, Bulgaria

Certifications

JUNE 2023 - JUNE 2026

DAMA CDMP Certification – Associate

DAMA International

MAY 2023 - MAY 2024

Microsoft Certified: Azure IoT Developer Specialty

Microsoft

DECEMBER 2021 - DECEMBER 2024

Microsoft Certified: Azure Solutions Architect Expert

Microsoft

OCTOBER 2020 - OCTOBER 2023

AWS Certified Developer Associate

Amazon Web Services

FEBRUARY 2020 - PRESENT

Microsoft Certified Solutions Associate (MCSA)

Microsoft

AUGUST 2018 - PRESENT

PowerCenter Data Integration 10: Developer, Specialist Certification

Informatica

Skills

Libraries/APIs

Spark Streaming

Tools

Informatica PowerCenter, Azure IoT Suite, Oracle Business Intelligence Enterprise Edition 11g (OBIEE), Informatica PowerExchange, Microsoft Power BI

Languages

SQL, T-SQL (Transact-SQL), Python, Snowflake, Java, C#, HTML

Platforms

Oracle, Azure, Databricks, Apache Kafka, Amazon Web Services (AWS)

Paradigms

ETL, Data Science

Storage

Database Modeling, Microsoft SQL Server, Oracle PL/SQL, SQL Server Integration Services (SSIS), SQL Server 2012, SQL Server 2008, SQL Server Analysis Services (SSAS)

Frameworks

Hadoop, Spark

Other

Data Warehousing, Data Engineering, Data Warehouse Design, Azure Data Factory, Big Data, Database Optimization, Machine Learning, Azure Databricks, Azure Data Lake, Natural Language Processing (NLP), IT Project Management, Stonebranch, Informatica Cloud, Data Architecture, Data Management, Data Governance

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