It was one of the most exciting and complex solutions I've ever participated in. About 50 people are working together to build something so useful and helpful for thousands of companies to manage their expenses and finally bring order where it's the hardest to achieve.

All the people involved in the project were constantly receiving real feedback from end consumers (where large companies were included), where they enthusiastically shared how much this product had improved their expense management experience.

Description:
It provides a powerful yet easy expense management solution, including real-time expense tracking and reporting through Center Expense. Manage travel and expenses in one place. Get visibility and control of all travel, including off-platform bookings.

Team structure and interaction: up to 6 teams that closely interact with each other and with the POs and UX teams directly, using Scrum with subsequent transition to SAFe.

Tools and technologies:
Microservices Architecture, JavaScript, TypeScript, NodeJS, Web (ReactJS, GraphQL, Apollo, AntDesign), AWS (Lambdas, API Gateway, SNS, SQS, S3, Event Bridge, Cognito, CloudWatch, ECR, Appsync), Databases (ElasticSearch, MongoDB, DynamoDB), Kubernetes, Health and Performance (Sentry, FullStory), Testing (React test library, Mocha, Chai, Selenium WebDriver, Allure), CI/CD with Jenkins and GitHub pipelines, infrastructure as code approach (Pulumi).

Responsibilities:
1. Leading a team of 7 developers for 3 years.
2. Participated in planning, development, and delivery of new functionality.
3. Involved in long-term planning.
4. Support and enhancement of existing functionality.
5. Code review.
6. Technical debt management.
7. Collaboration with DevOps and other Engineering teams.
8. Team extending, candidates interviewing, and new team members onboarding.
9. Creation and maintenance of all types of testing.
10. Support for system viability and improved productivity.
11. Product end-consumer support and rapid resolution of their issues.
12. Migration to new technologies, approaches, framework versions, and tools.
13. Documentation support and expansion.

Challenges:
Supporting system reliability and performance while continuously adding complex functionality, performing many computations and data mutations per each user request, optimizing database queries, and synchronizing with a large number of third-party systems and service providers.

Impact/value:
I took the initiative to break down several large and complex services into smaller ones. This improved the system's performance by eliminating some bottlenecks and significantly simplified the maintenance and further development of the services, thanks to more straightforward and more understandable areas of responsibility.

Results and achievements:
1. I gained my first experience as a team leader.
2. Led design, development, and delivery of a large amount of new functionality.
3. Recorded a significant number of satisfied end-users, increased consumer satisfaction.
4. Successfully migrated to new versions of lambdas, integrated Elastic search, and migrated data from DynamoDB.
5. Created and used data migration mechanisms for users to support the new product functionality.
6. Team members continuously grew professionally. I'm proud of the fact that during the project some engineers had grown from junior/middle up to senior level in pretty short terms.

Description:
Machine learning-based application with user-oriented UI. The goal of the project is to detect available parking spaces and predict the approximate availability of new parking spaces.

Tools and technologies: TypeScript, React.js, Redux, Websockets, NodeJS, PostgreSQL, SQLite, Jest.

Responsibilities:
1. Design and develop all the system from scratch, provided feature estimation.
2. Integrate with ML solution
3. Support and bug fixing.
4. Communication with customer engineers.
5. Build and support unit, functional, and integration tests.

Impact/value:
During the project, a decision was made to create several separate services, each performing a specific task. This allowed for more targeted and efficient scaling of the project to meet the client's needs without unnecessary costs associated with scaling parts that do not require it.

Results:
The system was successfully designed and created within the specified timeframe. It was tested on real cameras located in large municipal parking lots in different cities in the USA.

Description:
Bot for Skype and MS Teams that, after adding to a conference, analyzes the conversation, separates it by individual participants, generates a textual transcript of the entire call, and separately creates a summary with the most important information.

Tools and technologies: TypeScript, React.js, NodeJS, .Net Core, Microsoft bot framework, MS Graph API.

Responsibilities:
1. Design and develop the overall system from scratch.
2. Create and support tests.

Impact/value:
I have found a way to make the bot work with real-time voice calls (allowing it to add them to a 1:1 or group meeting) by sending system messages to get voice messages back in a loop and then gluing audio excerpts into continuous speech.

Results:
Developed the idea into a concrete implementation and conducted a presentation of the MVP of the product.

During this stage of my work at the Akvelon, I had only one active project in financial accounting and monitoring, in which I served as the technical lead for a newly formed team consisting of six senior full-stack engineers. My new responsibilities included participating in technical and architectural decision-making at the level of major features and the overall product. I was also involved in both short-term and long-term planning, as well as interacting with other teams.

Main responsibilities:
1. Lead and support a team of 6 senior engineers.
2. Both short-term and long-term planning using Scrum and SAFe. Sprint planning and reviews.
3. Helping the team make architectural and technical decisions.
4. Сloser collaboration with the UX team and the product owner team.
5. Code review.
6. Technical debt management.
7. Collaboration with DevOps and other Engineering teams.
8. Participate in quality team expansion, conduct technical interviews, mentor junior engineers, and create tailored development plans that align with the company's requirements and the engineers' aspirations.
9. Technical support for consumers.

The following technical stack was used:
1. Languages: JavaScript, TypeScript.
2. Backend: NodeJS, Serverless with AWS Lamdbdas.
3. Frontend: ReactJS, Apollo, AntDesign, Sentry, Fullstory, AWS Appsync.
4. Testing: Manual testing by developers, Unit and integration tests (Mocha), and Automated tests (WebdriverIO, Allure Reports).
5. Databases: DynamoDB, MongoDB, ElasticSearch.
6. Cloud: AWS (Lambdas, SQS, SNS, ServiceBus, ElasticSearch, DynamoDB, k8s, Appsync, API Gateway, CloudWatch), GCP (Google Maps Service).
7. Other: Corpay/Comdata, Google Maps API.

After gaining some experience and according to the company's internal competency matrices, I advanced to the next level.

At this stage, I primarily participated in large, long-term projects instead of quick and small ones. The main and most extensive project was in the finance sector, where I gained experience working with bank cards and transactions. I worked with the Corpay and Comdata interfaces. The main challenge was consistently meeting the reliability and security requirements, considering the specific nature of working with finances. Also, within a small team of 2 engineers, I designed and built from scratch a system to manage parking spaces on municipal parking lots in the USA using a micro-services approach.

Main responsibilities:
1. To be a part of team of full-stack engineers.
2.Delivering features including steps from reviewing description and UX, chosing technical solutions, implementing, manual testing, and automated tests creation.
3. Creating new microservices, and modifying existing ones.
4. Collaboration with DevOps team to integrate and support news system's units.
5. Participating in sprint plannings, sprint reviews.
6. Data migrations.
7. Technical support for consumers.
8. Participate in quality team expansion, conduct technical interviews, mentor junior engineers, and create tailored development plans that align with the company's requirements and the engineers' aspirations.

The following technical stack was used:
1. Languages: JavaScript, TypeScript.
2. Backend: NodeJS, Serverless with AWS Lamdbdas.
3.Frontend: ReactJS, Apollo, AntDesign, Sentry, Fullstory, AWS Appsync.
4. Testing: Manual testing by developers, Unit and integration tests (Mocha), Automated tests (WebdriverIO, Allure Reports).
5. Databases: DynamoDB, MongoDB, ElasticSearch, MySQL, SQLite.
6. Cloud: AWS, GCP.
7. Other: Corpay/Comdata, Google Maps API, Image processing with custom AI model.

This was just the first phase of my work at Akvelon.
I joined the R&D department, where there were many diverse projects that changed quickly, constantly pushing me to learn new technologies and approaches. I developed several interesting MVPs from scratch, including as a Microsoft vendor. One of successfully completed projects, a demo application for the new version of MS Graph API, was showcased as a demo at the Microsoft Ignite 2018.

Additionally, I got familiar with the Bot Framework and gained experience working with speech recognition using the service, as well as message context recognition using LUIS Cognitive Services. I also worked with MS Azure. Among databases, I had the opportunity to work with MS Azure Storage, Cosmos DB, MS SQL Server, and many others.

Main responsibilities:
1. Implementation of projects from scratch, including architecture and selection of technical solutions.
2. Support and expansion of functionality of existing projects.
3. Writing and supporting tests.
4. Participation in short-term MVPs and POCs.
5. Preparing reports and presentations upon completion of sprints/releases.

The following technical stack was used:
1. Languages: C#, JavaScript, TypeScript.
2. Backend: .NET Framework, NodeJS.
3. Frontend: ReactJS, Angular 2+.
4. Databases: MS SQL Server, MongoDB, SQLite, MySQL, Azure Storage, Cosmos DB.
5. Cloud: Azure, AWS, GCP.
6. Other: Microsoft Bot Framework, LUIS Cognitive Services, MS Graph API.

Over the course of almost two years, I participated in more than five different projects, gaining a wide range of experience. Most of the projects used .NET on the backend. It was also here that I first discovered that the backend could run on JavaScript (referring to Node.js) and gained my first experience writing a backend using Node.js. I also dealt with backend scaling using the pm2 tool.

Main responsibilities:
1. Implementation of projects from scratch under the guidance of an experienced mentor.
2. Support and expansion of functionality of existing projects.
3. Writing and supporting tests.
4. Preparation of reports and presentations upon completion of sprints/releases.

Participated as a part of team in the following projects:
1. Online interface for converting information for a manufacturing company. Technologies: .Net Core MVC6, ExtJS and Sencha, MongoDB.
2. Several projects using MEAN stacks lasting 1.5 - 2 months each.
3. Application using ASP.NET 4 MVC5, Knockout JS and MSSQL.

Completed myself following projects:
1. Migrating the application from MVC4 to MVC5.
2. Migrating part of the site from Knockout to Razor (SEO-centric site).
3. Mobile application for the iOS and Android for the customers of the manufacturing company. Technology: Ionic 2 (Angular 2).
4. The editor for presentations using the stylus. Technologies: Electron, ReactJS.
5. Organizer for projects with the integration of Google services (Google Drive, Maps, Calendar). Technologies: Electron and Angular 2.

• Field: Computer Systems and Networks

• Degree: Bachelor’s Degree

• Qualification: Computer engineering

• Date of graduation: 2016-06-30

• Diploma number: B16 136908

• Diploma with honours

• Field: Maintenance of computer systems and networks

• Degree: Junior Specialist

• Qualification: Technician programmer

• Date of graduation: 2013-06-30

• Diploma number: HP 45641312

• Diploma with honours