Yaroslav

YAROSLAV KORNIIENKO
Back-End .NET Developer · Azure & Cloud Integrations

[open contact info](look above in the "contact info" section) ⋄ Kyiv, Ukraine
[open contact info](look above in the "contact info" section) ⋄ [open contact info](look above in the "contact info" section)

SUMMARY
Back-End .NET Developer with 2+ years of commercial experience delivering production cloud services,
event-driven backends, and third-party API integrations on Microsoft Azure. Shipped end-to-end fea-
tures across multi-channel messaging platforms, serverless data pipelines, and CRM automation. Strong at
owning architectural decisions, debugging in production, and driving features from requirements through
deployment. Proven leadership and collaboration background from active involvement in a youth leadership
organization.
Holder of the Google Cybersecurity Certificate with a growing interest in application security — authenti-
cation and authorization, secure handling of secrets, and common web vulnerabilities.

SKILLS
Languages: C#, JavaScript / TypeScript, Python (scripting), SQL
Back-End: .NET Framework 4.8, .NET 8 / 10, ASP.NET Core, EF Core, LINQ, FluentValidation
Cloud & Services: Microsoft Azure — Functions, Durable Functions, Service Bus, Blob Storage, App
Service; basic GCP
Databases: MS SQL Server, PostgreSQL, Cosmos DB, SQLite, Microsoft Dataverse
APIs & Integrations: REST APIs, Webhooks, Microsoft Graph API, Meta (Instagram/Facebook) Web-
hooks, Telegram Bot API, Google Maps API, Jira REST API, Microsoft Partner Center API
Testing: xUnit, NUnit
Tools & DevOps: Git, GitHub, Azure DevOps (Repos, PR workflow), GitHub Actions, CI/CD pipelines,
Postman, Plugin Trace Viewer, XRMToolbox, Visual Studio
Concepts: SOLID, Clean Architecture, RESTful API design, CQRS + MediatR, Event-driven architec-
ture, Webhook processing
Spoken languages: English (B1), Ukrainian (Native)

CERTIFICATIONS
Google Cybersecurity Professional Certificate — Google (Coursera) May 2024
Security frameworks (NIST), networks, Linux and SQL, threats and vulnerabilities, detection
and response. Credential ID: SHYZELWY5CDK

EXPERIENCE
Dynamics .NET Developer – Progresia May 2025 – September 2026
Altana — Multi-channel messaging platform; Azure-based integrations and Dynamics 365 services
Altana is a production communication hub integrating Microsoft Teams with Instagram, Facebook, Tele-
gram, Viber, and Google Maps. Worked across Azure-hosted backend services, third-party API integrations,
and Dynamics 365 server-side logic.
Key contributions:
• Eliminated a critical concurrency bug in the recurring task generation pipeline by re-architecting it on
Azure Durable Functions with session-based coordination, guaranteeing exactly-once execution under
parallel triggers.
• Designed Azure Service Bus scheduled-message processing for client-response SLA tracking, including
DLQ handling and idempotent retry — adopted across all integrated channels.
• Built end-to-end Meta webhook pipeline (Instagram, Facebook) covering mention handling, bidi-
rectional reaction sync with Teams, and read-receipt tracking, with deduplication logic for overlapping
payload events.

• Delivered full Google Maps Reviews integration, enabling managers to receive and reply to public
reviews directly inside Teams.
• Migrated Microsoft Partner Center integration to the OAuth 2.0 Secure Application Model, keeping
the platform compliant with Microsoft’s 2026 MFA enforcement.
• Secured service-to-service webhook calls with shared-secret authentication and managed application
secrets in Azure Key Vault (read and write through the Azure SDK).
• Implemented Microsoft Graph API workflows for Teams file access control, automatically syncing
SharePoint permissions when chat participants change.
• Built a UTM-attribution pipeline from the website widget through Azure Blob Storage to CRM,
attributing traffic sources across all messenger entry points.
• Integrated third-party services as Dynamics custom steps: eSputnik SMS, Jira (bidirectional deal-issue
sync), YouControl (bulk counterparty verification from entity views).
Back-End .NET Developer – SoftServe May 2024 – March 2025
Streetcode — Collaboration with ITA Social Projects
Public platform preserving Ukrainian historical content; production ASP.NET Core backend.
Key contributions:
• Implemented REST endpoints for core content modules (streetcode pages, timeline, facts, media galleries)
as CQRS + MediatR command and query handlers, keeping controllers thin and business logic isolated.
• Wrote FluentValidation rules for create and update requests, returning consistent, field-level error
responses to the React front end.
• Added EF Core migrations and seed data for new entities and relationships, keeping local, staging
and production schemas in sync.
• Covered new handlers with xUnit and Moq unit tests and extended integration tests for the data layer
as part of the team’s definition of done.
• Reviewed teammates’ pull requests and extracted duplicated mapping and validation code into shared
helpers.

LEADERSHIP & VOLUNTEERING
Leadership Role – Poklyk Yaru (Ukrainian Youth Leadership Organization) 2020 – Present
• Hold a leadership role within the organization’s governing body, overseeing member development and
strategic growth.
• Coordinated events of up to 250 participants; organized and led summer camps and training programs
with 40+ participants per session.
Key soft skills: Leadership, team coordination, public speaking, mentoring, conflict resolution.

EDUCATION
Bachelor’s degree, National University of Life and Environmental Sciences of Ukraine 2020 – 2024
Automation and Computer-Integrated Technologies
ItStep Academy, Kyiv 2020 – 2022