Сергій

Postolenko, Serhii
Role: Middle+ .NET Developer (Backend-Focused, Some Full-
Stack)

Specialization: C# | ASP.NET Core | SQL | Microservices (Basic,
RabbitMQ) | Angular (Refreshing) | React (Learning)

Location: Dnipro

SUMMARY
Backend-focused .NET Developer with 6+ years of experience in developing enterprise solutions.

- Strong expertise in ASP.NET Core, C#, SQL Server, PostgreSQL, MySQL, Entity Framework
Core.
-Worked with foreign clients (USA, Europe) in Oil & Gas, E-commerce, and CRM domains.
- Applying microservices (RabbitMQ, SQL-based), unit testing (xUnit) and exploring DDD
principles in a personal project.

EXPERIENCE
6+ years

CORE SKILLS
Backend: NET 5-9 (main), NET Core 2.2, 3.0 (past experience, legacy support), C#, ASP.NET
Core, REST API, Entity Framework Core, SQL Server, PostgreSQL, MySQL
Architecture: SOLID, Clean Architecture, DDD (personal projects)
Microservices: Basic Microservices (RabbitMQ)
Testing: xUnit, Unit Testing
Frontend: Angular (past experience, refreshing knowledge), React (learning)
Tools: Git, Visual Studio, Visual Studio Code, Azure DevOps (repo & task tracking)
Other: WPF (past projects), Neo4j (personal projects, 1-2 years)

BUSINESS DOMAINS
· Oil & Gas – Enterprise production & monitoring systems
· E-commerce – Invoice processing, CRM systems
WORK EXPERIENCE
Luxoft
Apr 2023 – Present, Backend Software Developer
Ukraine | US | India
Web application aimed at Mineral production
and monitoring. The project has been started
from scratch.
Working with a customer who is one of the world's largest providers of products and
services to the energy industry, that develops and supports cloud-based enterprise
information systems in Oil & Gas domain.
Customer:Halliburton

Responsibilities:

I participated in the implementation of new features from scratch and conducted the
maintenance of the developed functionality.
I performed clarification of customer’s requirements, solution implementation, code
review, code refactoring. Areas of support: developing the app itself, cross-app
communication, database script creation, database development, data migration.

Technology and Skills:

Asp.NET Core, C#, Entity Framework Core, PostgreSQL, ADO, Python, Web
Development

Aug 2022 – Apr 2023, Backend Software Developer
Ukraine | US
Desktop complex application aimed at Gas and oil production, integration across geophysics
and geology systems.

Customer: Halliburton
Responsibilities:

I participated in implementation of new features and conducted the maintenance of the
developed functionality. I performed clarification of customer’s requirements, solution
implementation, code review, code refactoring. Areas of support: developing app itself,
bug fixing.

Technology and Skills:

ADO, C#, Pascal, Unit Testing, WPF
IT Craft
Dec 2021 – Jul 2022, Software Developer
Ukraine | US
Web application aimed for meat packing company.

Customer: NDA
Technology and Skills:

ADO, Angular, ASP.NET Core, C#, PostgreSQL

Custom Solutions
May 2020 – Dec 2021, Software Developer
Ukraine | Australia
Web application aimed for Invoice processing system.

Customer: Rapid EM
Technology and Skills:
ADO, Angular, ASP.NET Core, Entity Framework (EF Core), C#, Angular, Microsoft
SQL Server, Web Development

R2QOE
Nov 2019 – Feb 2020, Software Developer
Ukraine | US
Web application aimed at invoice and document processing the systems for big merging
companies.

Technology and Skills:

ASP.NET Core, C#, MySQL, Unit Testing, Web Development

Unicreo
Apr 2019 – Jun 2019, Software Developer
Dnipro
Desktop application aimed for instant messaging system.

Customer: NDA

Technology and Skills:

ASP.NET, C#, Microsoft SQL Server, Unit Testing

Jan 2019 – Mar 2019, Software Developer
Dnipro
Internal Project. Commercial CRM and Document Processing System using
microservices.

Customer: Internal
 Technology and Skills:

ASP.NET, C#, Entity Framework (EF Core), Microservices, Microsoft SQL Server,
RabbitMQ, Redis, Unit Testing

Aug 2018 – Dec 2018, Software Developer
Dnipro
It was CRM and Document Processing System

Customer: Internal
Technology and Skills:

ASP.NET, C#, Entity Framework (EF Core), Microsoft SQL Server, Unit Testing, Web
API, Web Development

FreshD

Apr 2016 – Oct 2016, PHP Fullstack Software Developer
Dnipro
There were 3-4 projects for Ukrainian commerce domain websites written on MODX with
PHP, MySQL, jQuery and AWS APIs.
Customer: FreshD

Technology and Skills:

jQuery, MODX, MySQL, PHP, Web Development

LANGUAGES

Ukrainian – Proficient

English – Upper Intermediate

EDUCATION
2018 Dnipropetrovsk National University n.a. O. Honchar
Bachelor of Information Systems, Computer Science

CURRENTLY WORKING ON
Outside pet project on Wikipedia Person Pages Data Analytics
Learning React, DDD, Microservices, DevOps