Nick Ivanov
Verified Expert in Engineering
C# Developer
Cheboksary, Chuvashia Republic, Russia
Toptal member since October 10, 2016
Nick is a senior .NET and full-stack engineer with 17+ years of experience building SaaS products, payment systems, integrations, microservices, and high-load back ends. He combines deep experience in C#, ASP.NET Core, SQL, PostgreSQL, AWS, Docker, and React with clear communication and strong ownership of production systems.
Portfolio
Experience
- C# - 15 years
- ASP.NET - 15 years
- SQL - 14 years
- React - 6 years
- Git - 5 years
- .NET Core - 4 years
- Angular - 2 years
- NoSQL - 2 years
Work Experience
Full-stack Developer
Lauritzen Bulkers
- Moved application service to Azure Durable Functions.
- Prepared database migrations, reworked table structures, and wrote code to get data from 3rd-party APIs.
- Automated deployment of infrastructure with Bicep files.
- Fixed old bugs and issues in the application that were spotted during migration.
Full-stack Developer
Social Media Management Company
- Took over the project from the previous team, completed the MVP, and released it to the public.
- Integrated many APIs: Facebook, Instagram, X, Google My Business, Pinterest, LinkedIn, Google Drive, OneDrive, DropBox, Stripe, etc.
- Supported all technical aspects of the projects, including infrastructure, database, back end, and front end.
- Advised best approaches and implemented several ideas to improve user experience and product quality in general.
.NET/Full-stack Developer
Fitogram
- Developed the studio management and booking tool software's payment, accounting, and booking part.
- Worked on modularizing pre-existing monolith application, split it into modules and microservices, and improved existing microservices.
- Performed the optimization of API endpoints, background jobs, and EF queries. The most memorable single optimization reduced the load on the CPU of a powerful server from nearly a constant 100% to below 10%.
- Updated the apps from .NET Framework 2/3 to .NET 6, Entity Framework from 3.1 to EF Core 6, and kept other tools and libraries up to date.
- Integrated the app with Stripe (subscriptions, invoices, connect, cards, SEPA Direct Debit, and iDEAL) and PayPal (commerce).
- Improved code coverage and code quality using SonarQube.
- Helped on the FE by adding forms, fixing bugs, and removing legacy code.
.NET/Full-stack Developer
BulaLaw dba Bula Intelligence
- Added new functionalities to a pre-existing website and fixed issues, including security-related.
- Managed deployment options, resources used, and plans on Azure.
- Optimized the code to improve latency and user experience.
.NET/Full-stack Developer
Theoryfarm, LLC
- Developed digital marketing software from scratch with ASP.NET MVC.
- Applied a continuous integration with Jenkins and Bitbucket and set up the automatic deployment to Docker containers.
- Ensured high quality by adding multiple unit and end-to-end tests.
.NET/Full-stack Developer
Lykke
- Built microservices for a financial market company that processed and transferred data from RabbitMQ, Azure Storage, MongoDB, and APIs to another Azure Storage and SQL Server.
- Developed a reporting web application for office managers. Reports could be viewed on the web application and downloaded in the Excel or CSV format.
- Created a back-office web application for office managers and CRUD operations.
- Synchronized local database data from the Coinprism and Blockchain API.
.NET/Full-stack Developer
MultiSite Systems
- Developed a responsive web application using MVC and EF based upon a smart-admin C# Bootstrap-themed template from WrapBootstrap.com.
- Created fillable PDFs with Acrobat DC and filled them with iTextSharp and PDFSharp.
- Developed a Windows Form application that could transfer files via FTP/SFTP and export data to XML, compatible with a government-provided XSD.
.NET/Full-stack Developer
Centaur Software
- Developed a single-page application (call center) for Australian dental clinics. The new website was intended to replace big legacy desktop applications. It had an appointment book, patient profile pages, and other features.
- Worked with SQL Anywhere database by writing stored procedures and calling them using C#.
- Collaborated with a team of five developers in a Moscow office.
.NET/Full-stack Developer
Spargo Technologies
- Built a website on the ASP.NET Web Form platform integrated with SQL Server, PostgreSQL, and MongoDB using DevExpress tools. SQL Server and PostgreSQL database size exceeded hundreds of millions of monthly rows.
- Developed services that received a lot of data and loaded them into DB.
- Created and improved database structure and procedures mainly for the site's needs.
- Built, installed, and maintained various data processing services.
- Worked on a small team of developers in the Moscow office.
.NET/Full-stack Developer
METRO Cash & Carry
- Developed an app that printed information on plastic cards that customers used as their identifications in the company's shops. The app could take photos and supported several templates and languages.
- Created an MVC website that supplied all the information needed for banks to integrate the company's customer cards into their bank cards.
- Helped migrate one of the intranet sites to a Java platform with a Kendo UI.
- Performed data processing tasks using Oracle database.
- Worked in a small team of developers in the Russian headquarters.
.NET/Full-stack Developer
Prosoft
- Developed several websites from scratch using custom CMS. Features included product catalog, news, events, surveys, registration, personal account, reports, sitemap, etc. The websites were usually integrated with an ERP system.
- Improved preexisting websites by adding new features, fixing bugs, improving performance, and performing SEO tasks.
- Developed the SQL Server database structure, procedures, functions, and triggers.
- Developed a CMS system using .NET WinForms, SQL Server, and Oracle.
- Developed site indexing using Search Server 2010 (part of SharePoint).
.NET/Full-stack Developer
Masco-Glass Production
- Developed an ERP system (.NET WinForms, SQL Server, DevExpress, and VBA).
- Developed an eCommerce website that allowed customers to make orders online, see prices, stock, etc.
- Constructed and improved the database architecture and the procedures as needed for the site.
- Created, installed, and maintained various data processing services.
- Built big and complex SQL functions for data analysis purposes.
Project History
PiSeas Web Application
Resident Portal
Data Scraping Tool for an HR Agency
Umbraco Website
Microsoft Teams Bot for a Cloud-based Translation Company
Education
Specialist's Degree in Information Security
Volgograd State University - Volgograd, Russia
Skills
Libraries/APIs
Log4Net, Entity Framework, Web API, Moq, Azure Blob Storage API, React, Slick, REST APIs, Amazon API, ASPX, jQuery UI, AutoMapper, jQuery, Windows Forms (WinForms), jQuery DataTables, API Development, Stripe, Stripe API, Stripe Connect, Stripe Connect API, PayPal API, EPPlus, SendGrid API, Auth, Puppeteer, LINQ, NSubstitute, jQuery File Upload, iTextSharp, PDFSharp, Apache Lucene, Facebook Messenger API, Coinbase API, Node.js, OneDrive
Tools
Visual Studio 2019, Visual Studio, NuGet, ReSharper, xUnit, Azure App Service, SendGrid, Azure Search, Autofac, Hangfire, Visual Studio 2008, Visual Studio 2010, Visual Studio 2012, Visual Studio 2013, Visual Studio .NET, C#.NET WinForms, Angular CLI, TFS, Subversion (SVN), Git, Redmine, Jira, SourceTree, Bitbucket, GitHub, TortoiseSVN, VisualSVN, RabbitMQ, Microsoft Visual Studio, Stripe Checkout, Travis CI, Docker Compose, Confluence, Asana, Airbrake, Microsoft Unit Tests, MSTest, Microsoft Excel, Slack, Visual Studio 2015, WebStorm, SonarQube, Sonar, Dapper, Microsoft Access, GitLab, PyCharm, Plotly, Codecov, Auth0, Microsoft Teams, Microsoft Power BI
Languages
XML, Transact-SQL (T-SQL), Active Server Pages (ASP), HTML4, C#.NET, SQL, Visual Basic .NET (VB.NET), C#, TypeScript, Visual Basic, VB.NET, Stored Procedure, GraphQL, Web Services Description Language (WSDL), XSD, CSS3, HTML5, HTML, CSS, JavaScript, Visual Basic for Applications (VBA), Python 2, Python, Python 3, Java
Frameworks
ASP.NET Core, ASP.NET Core 2, ASP.NET Core MVC, MVC Razor, NUnit, Bootstrap, ASP.NET MVC 5, ASP.NET MVC 4, ASP.NET MVC 3, Entity 5, Entity 4, .NET Compact, .NET 4, .NET Core, Angular, ASP.NET, ADO.NET, ASP.NET Web Forms, .NET, ASP.NET Web API, AngularJS, ASP.NET MVC, Bootstrap 3, Entity 6, Entity, Entity Framework Core, .NET 3, .NET 2, .NET 5, Swagger, Razor, Razor Pages, .NET 6, JSON Web Tokens (JWT), .NET 7, ASP.NET Identity, .NET 9, Windows Presentation Foundation (WPF), Selenium, Angular Material, React Native, Classic ASP, Express.js, Protractor, Knockout (Knockout.js), Telerik Kendo UI, Kendo UI, jQWidgets, Flask, Azure Bot Framework, Blazor
Paradigms
Gang of Four (GOF) Design Patterns, MVC Design, Model View Controller (MVC), RESTful Development, Microservices Architecture, Microservices, REST API Architecture, Domain-driven Development, Requirements Analysis, API Architecture, Dependency Injection, Agile, Test-driven Development (TDD), REST, Object-oriented Programming (OOP), Unit Testing, Scrum, Azure DevOps, Object-oriented Design (OOD), ETL, Asynchronous Programming, Web Architecture, Continuous Delivery (CD), Event-driven Programming, Event-driven Architecture, Application Architecture, Windows App Development, Agile Software Development, Lambda Architecture, Role-based Access Control (RBAC), Model View ViewModel (MVVM), MEAN Stack, DevOps
Platforms
Visual Studio 2017, Kubernetes, iOS, Azure Functions, Web, Microsoft, Amazon, Amazon EC2, Azure IaaS, Azure, Visual Studio 2016, Visual Studio Code (VS Code), Amazon Web Services (AWS), Windows, Docker, NLog, Windows Server, Windows Desktop, Windows Server 2016, Umbraco, DigitalOcean, Linux, Heroku, Mailgun, AWS Lambda, Telerik, SharePoint, Blockchain, Ethereum, Oracle, Google Cloud Platform (GCP)
Storage
Web Forms, Redis, SQL CLR, Amazon S3 (AWS S3), Azure Websites, Azure SQL, Azure Blobs, JSON, Azure Table Storage, Microsoft SQL Server, NoSQL, PostgreSQL, SQL Server 2016, SQL Server 2012, SQL Server 2017, PostgreSQL 10, Datadog, SQL Server Management Studio (SSMS), Databases, SQL Stored Procedures, Azure SQL Databases, SQL Server 2014, MongoDB, MySQL, Elasticsearch, SQL Anywhere, SQL Server Reporting Services (SSRS)
Other
Web MVC, Console Apps, Functions, Azure Virtual Machines, Caching, RESTful Microservices, REST API Clients, HTTP REST, Repository Pattern, Technical Documentation, WebSockets, System Architecture Design, System Architecture, Architecture, Requirements, Full-stack, Ajax, Entity Relationships, C# Operators, Requirements & Specifications, APIs, Fillable PDFs, Information Security, HTTP, Enterprise Resource Planning (ERP), DevExpress, IIS, Pattern Design, Responsive UI, EF6 Code First, Domain-driven Design (DDD), Microsoft Azure, PayPal, Bootstrap 4, Content Management Systems (CMS), eCommerce, Reports, API Integration, Stripe Payments, Stripe Marketplace, Stripe Subscriptions, Credit Cards, Payment APIs, Card Payments, Online Payments, SaaS, PostgreSQL 9, Message Bus, Sprints, DI, Optimization, Invoices, Message Queues, Code Coverage, Containers, Complex Problem Solving, SQL Design & Reporting, Back-end, Endpoint Security, Single Sign-on (SSO), Solution Architecture, CI/CD Pipelines, Software Architecture, Web Development, Secure Web Development, Web Security, Quality Assurance (QA), SOAP, Messaging, Internet of Things (IoT), Full-stack Development, HTTPS, Authentication, Data Conversion, Data Engineering, Pub/Sub, Server Security, Server Management, IT Security, Integration, Data Analysis, Web App Development, Database Schema Design, API Management, AWS Cloud Architecture, Software Testing Automation Framework (STAF), Site Reliability Engineering (SRE), Images, SOLID Principles, Web Applications, Performance, Web Technologies, Front-end, Microsoft Stack, Legacy Software, Windows Desktop Software, Scheduling, Cloud, Multitenancy, Software Engineering, Internet Information Services (IIS), Back-end Development, Technical Leadership, Lambda Functions, Server-side PDF Generation, QR Codes, Live Chat, .NET Framework, Migration, Application Modernization, RESTFul APIs, Data Modeling, Debugging, Troubleshooting, MVC Frameworks, FTP, SFTP, AppVeyor, Search, VM, Windows Communication Foundation (WCF), PDF, Integration Testing, Scraping, Web Scraping, Data Visualization, User Interface (UI), Adobe Acrobat Pro, Bots, Chatbots, Bitcoin, Vi, QA Automation, Amazon RDS, Security, Microsoft Graph API, Infrastructure as Code (IaC), GitFlow
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