Serhii Speshylov, C# / Azure developer
Contacts
- LinkedIn: linkedin.com/in/krb3d
- GitHub: github.com/krb3d
- Email: serhii.in.de@gmail.com
Profile summary
I’m an experienced Software Engineer with a strong background in Backend technologies, including C#/.NET, Microsoft Azure Cloud, and SQL/NoSQL Databases. Backed by over 9+ years in the IT and services industry. My academic focus was on Mechatronics, Robotics, and Automation Engineering.
I specialize in developing backend applications (including design and deployment phases sometimes), with a core emphasis on integrating software to solve critical business challenges. I believe well‑designed backend systems are the foundation of successful digital ventures.
Beyond work, I’m passionate about staying current with technology trends and sharing knowledge with fellow enthusiasts.
Let’s connect for exciting tech discussions or potential collaborations.
Education
Sevastopol National Technical University, 2007, Sevastopol, Ukraine
- Specialist degree (5 years), Automated Application Systems department
My main skills and tech stack
- C#/.NET Core
- Cloud Design Patterns
- ASP.NET Core Applications
- Azure stack, IaaS and PaaS:
- Azure Functions
- Service Bus
- CosmosBD (NoSQL)
- Event Grid
- Azure Storage
- Disributed Systems
- SQL: Entity Framework Core, Dapper
- Messaging systems, data processing flows
- Standalone workers
- Dockerized applications, Microservices
- Base DevOps practicies, CI/CD, GitHub Acions / Azure DevOps
- Basic Javascript, willingness to go deeper (TypeScript / frameworks)
Languages
- English - professional working proficiency
- German - A1, attend language courses
- Ukrainian - native speaker
Professional experience
Senior Backend Developer, C# / .NET Core / Azure
Berlin Brands Group (Multibrand e-commerce), berlin-brands-group.com
Jun. 2021 - Nov. 2023, Germany
- Adjust services Performance and Design for High Load events like Black Friday,
- Design and Implement multiple internal services and APIs, cloud-based and on-premise deployed,
- Document Distribution Service - API on top of Azure Storage and CosmosDB with flexible documents upload and query capabilities,
- Lookup Service - support service for domain models conversion libraries,
- APIs and services for processing and transfer Orders from external markets to internal systems,
- ERP data exchange API facades and converters,
- Prepare DevOps Pipelines and Azure ARM Templates for build and deployments,
- Interviews, Onboard for newcomers, Knowledge sharing
Backend Developer, C# / .NET Core / Azure
Softpositive (IT Services and consulting), softpositive.com
May 2019 - Jun. 2021, Germany client, remote from Ukraine
- Cloud-based ESB pattern design and implementation,
- Step-by-step logging design and injection to existing APIs,
- Prepare Azure pipelines for build and deployments,
- Box packing helper API with Vue.js UI - parcel packing service for warehouse workers
Full-stack Developer, C# / .NET Core / Javascript
Dynamica Labs LLP (MS Dynamics CRM integrator), dynamicalabs.com
Sep. 2018 - May 2019, United Kingdom, remote from Ukraine
- Plugins adaptation for business requirements,
- Custom Windows services and console utilities for data management,
- Web pages for custom CRUD operations and reports,
- Working with Vue.js, Rewriting part of existing functionality to Promises/Async way,
- T-SQL: data updates and analyze
ERP Developer for HQ Sales Department
Roshen (Confectionery corporation), roshen.com
Jan. 2018 - Sep. 2018, Ukraine
- Revision for b2b exchange data flow, implementation of new cache layer based on hashes, up to 100x processing time speed up,
- Rework of internal geodata visualization tool based on Google Maps
- Transfer logic layer from dedicated server service into client-side, javascript,
- Adjustment of the proprietary reporting subsystem to the requirements of business: new data dimensions, overall speed up and new flexible data load tool.
Lead ERP Developer
Roivix.com (business and IT consulting), roivix.com
Nov.2016 - Aug. 2017, Ukraine
Design and implementation of business modules for ERP/Accountant systems for clients like McDonalds Ukraine and Pepsico Ukraine
Lead Developer for Point-of-Sale System
Eroglu holding (clothes retail, Colins™ jeans), colinsjeans.com
Sep. 2011 - Aug. 2016, Ukraine / Turkey
- Requirements gathering, System Design, and Implementation of Point-Of-Sale system,
- Integration of retail hardware to POS: ticket printers, barcode scanners, price checkers,
- Development of replication system via Web services: from store sales to office reports with a short delay,
- Design and implementations of “Reports via email” subsystem: auto-repair and send sales reports given by email body query,
- Design and implementation of flexible system for calculation of discounts/marketing actions,
- Integration with MS Dynamics AX via dedicated C# service,
- Integration with 3rd party systems: accounting, CRM, visitors counting devices
- Development team management, system growth planning,
ERP Developer, Lead of Deployment team
1C-Rarus (business automation and consulting), 1c-rarus.com
Sep. 2007 - Aug. 2011
- Development of business automation software on 1C:Enterprise framework,
- Adaptation and deployment software in outsource basis, staff training
- Performance testing, recommendations for improvements
- Business process analysis, requirements gathering, task management
Courses, Projects and Certifiates
| Microsoft Certified: AZ-900 Azure Fundamentals |  |
| The Creative Javascript Course | Code Repository |
| The Creative HTML5 & CSS3 Course | Code Repository |
| Unity3d, Basic Kitchen Arcade Game, course by CodeMonkey | Code Repository, Play Game |