Andrey

Andrey
Nikolaev
C# (.NET) Developer

Profile
C#/.NET Developer with hands-on experience building and supporting
backend services and integrations using ASP.NET Core, REST APIs, and
relational databases (MS SQL Server, PostgreSQL). Strong focus on
maintainable code, API integrations (social platforms/CRM), reporting
automation (Excel/PDF/invoices), and operational visibility using
Contact Grafana/Datadog. Comfortable working in cross-functional teams and
delivery workflows.
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Work Experience
https://github.com/nikolaev333

AUGUST 2024 - TILL NOW
https://www.nikolaevsoft.work/
REFLECTION INFOSYS Ltd. l Remote

Education .NET Developer (C#)
Developed and maintained .NET / ASP.NET Core Web API services with focus on
scalability, performance, and clean architecture.
Dimitar A. Tsenov Academy
Integrated external REST APIs (HubSpot, YouTube, Twitter/X and others) including
of Economics - Svishtov
authentication flows; validated and debugged requests with Postman.
Bachelor of Finance Managed and optimized MS SQL Server (schema changes, query optimization, data
integrity).
Completed in 2023 Automated Excel reporting and data workflows, reducing processing time.
Dimitar A. Tsenov Academy of Supported frontend tasks in cross-functional teams using JavaScript / HTML / CSS.
Economics - Svishtov Implemented monitoring and operational visibility using Grafana and Datadog
(dashboards, alerts, incident investigation).
Master's degree of Social Delivered multi-platform streaming orchestration
management (YouTube/Facebook/Instagram/Twitter/X), including status synchronization and
stream lifecycle management.
Completed in 2024
Built NFT minting flows (ERC-721 / ERC-1155) and multi-chain support
St. Cyril and St. Methodius - V. (Ethereum/Polygon/Base; Solana prepared).
Turnovo Implemented video pipeline using FFmpeg/GStreamer with HLS playlist generation
and RTMP output.
Master's degree of Web technologies
and software development Tech:
.NET Core 3.0 Bitbucket Pipelines
ASP.NET Core Web API React 18
EF Core FFmpeg
Personal skills SQL Server (Azure)
Hangfire
GStreamer
HLS
Docker RTMP
Problem-solving mindset
Debugging & root-cause analysis
Clean code & attention to quality OCTOBER 2023 - JULY 2024
Effective communication IG ENGINEERING Ltd. l Remote
Continuous improvement &
.NET Developer (C#)
learning
Developed and maintained backend functionality in .NET / ASP.NET to support internal
workflows and business operations.
 Courses Designed and optimized PostgreSQL schemas; delivered schema changes,
indexing, and query performance tuning.
Implemented data access using Entity Framework, focusing on clean
SoftUni Academy architecture, maintainability, and efficient queries.
Built and integrated REST APIs (internal and third-party) to automate processes
C# Course
and extend platform functionality.
JavaScript Course Tested and troubleshot APIs using Postman, supporting stable releases and
faster issue resolution.
Microsoft Access 2016
Delivered document automation: generated PDF invoices/confirmations and
GitHub Course Excel reports/exports aligned with financial and operational reporting needs.

English Language Course - In progress Tech:
Windows Server 2022 Administration C# 10 (.NET 6) REST APIs
In progress .NET 6 (LTS) Postman
ASP.NET Core 6 (Web API) PDF Generation
Entity Framework Core 6 Excel Reporting

Languages PostgreSQL

MAY 2023 - SEPTEMBER 2023
Bulgarian SINE CERA Ltd. l Startup Project l Remote
English
Java Developer
Romanian Developed backend features using Java 17 and Spring Boot (REST APIs) for an
Russian online restaurant menu & ordering platform (customizations/add-ons,
nutrition/calorie data).
Implemented registration/login flows with validation and basic authorization
(role-based access where applicable).
Worked with MySQL (schema updates, query optimization, data consistency) to
support users, menu items, and orders.
Tested and debugged APIs using Postman; managed dependencies/builds with
Maven.
Supported issue tracking and fixes in the delivery workflow; collaborated on
requirements and deployments.

OCTOBER 2022 - APRIL 2023
Marathonbet l Varna, Bulgaria
Fraud Team Leader
Introduced new procedures and defined tasks to improve team workflow and
consistency.
Prepared the monthly schedule for the whole team to ensure full coverage and
balanced workload.
Led coordination meetings between offices to align on cases, updates, and
priorities.
Conducted interviews and supported hiring and onboarding of new employe.

JANUARY 2021 - SEPTEMBER 2022
Marathonbet l Varna, Bulgaria
Fraud Analyst
Document verification
Checking gaming patterns (in the field of sport betting, casino and trades)
Online support through chat
Resolving issues and requests from payment providers via emails
Account checks
Training new colleagues in the office

AUGUST 2020 - DECEMBER 2020
Modis l Remote
Technical Support with Romanian and English
Provided end-user technical support and troubleshooting (software, access,
peripherals).
Managed account tasks via Active Directory (password resets/unlocks) following
authorization procedures.
Supported Windows 10 → Windows 11 migration and post-upgrade checks.
Assisted with 2FA (mobile fingerprint) setup and B-TRUST digital signature
configuration.