Gleb Chermennov

senior

Registration: 26.01.2025

Specialization: Backend Engineer

— 16 years of experience developing web, desktop applications, background services and distributed systems. — Strong OOP and design skills, unit-testing. — Experience creating and maintaining microservices (build-deploy-test cycle) and migrating from existing monolithic apps towards them. — Hands-on experience with several programming languages: C# (proficient), Scala, Python (medium), JavaScript, Typescript. — Curious about observability and SRE practices (finding out about user problems and potential incidents as quickly as possible, or better – in advance before the problem). — Working knowledge of Linux and shell scripts. — Familiar with deploying services using Docker, Kubernetes basics. — Used Relational Databases: Sql Server, Postgresql, MySQL. — Used NoSql databases: Redis, Elasticsearch, basics of MongoDb. Key qualities: — Confident in my knowledge of C# and .NET platform. — Working with .NET stack - .NET Core 7, .NET Framework 4.8, ASP.NET MVC/Web API, Entity Framework (6.x/Core), NHibernate. — Writing client-side JavaScript using Knockout, Vue.js 2, basic Angular 1.x with Gulp/Grunt as a build tool. — Application development using MS SQL Server, PostgreSql and MySQL for storage. — Writing complex SQL queries. — Experience with various NoSql databases (writing queries, cluster maintenance, replication setup, periodic backups) - Redis, Elasticsearch, RavenDb, basics of MongoDb. — Understanding of OAuth, integrating with Google services (Calendar, TimeZone, Geocoding). — Working with cloud platforms - AWS (EC2, S3, SQS, SNS), GCP (Storage, Geocoding). — Developing distributed applications using RabbitMQ, Kafka, IBM MQ. — Experience writing unit and integration tests - xUnit.net, MSpec Linux and shell scripting (both in Linux and on Windows via Cygwin). — Writing scripts that automate various common tasks (uploading log files to the cloud, setting up databases, making backups). — Working with bug-tracking systems and version control - Git, Mercurial, Jira, YouTrack. — Familiar with Continuous Integration principles. — Working knowledge of various TeamCity setups (Powershell scripts for application deployment, applying database migrations). — Understanding principles of building distributed applications. — Strong OOP and design patterns knowledge.

PostgreSQL C# .NET Redis .NET Framework SQL Server .NET Core OOP Entity Framework ASP.NET

Skills

.NET

.NET Core 7

.NET Framework 4.8

OOP

PostgreSQL

SQL Server

Work experience

Senior Backend Engineer

since 12.2022 - Till the present day |NDA

PostgreSQL, Entity Framework, Redis, Kafka, RabbitMQ, Quartz.NET, PlantUML, xUnit, Moq, Fluent Assertions, Azure pipelines, Kubernetes, Open Telemetry, Prometheus

Developing system for broadcasting information about sport events for bidding on match results or specific actions (total number of goals, goal difference, etc.). Supports several sports, pre-match team coefficients and scouting information sources (stadium signals). ● Designed, developed and deployed a service that downloads match fixture list and fixture changes from another vendor and sends them to downstream services for processing. ● Adding support for new sport in existing services. ● Extending one of communication channels to consumer by adding new message types signaling for bet cancellation main achievements. ● Helped automate DB schema migration process. Before that developers applied migration scripts manually for each environment. ● Led the effort for using backward-compatible migrations so we can roll out schema changes without breaking existing services. ● Advocated for refactoring and extracting infrastructure code to common libraries (config validation, event dispatcher, caching). ● Participating in code review, shipping releases to live environment, taking part in system architecture meetups.

Senior Backend Engineer

11.2019 - 12.2022 |Zeal Group

ASP.NET Core, Entity Framework, Quartz.NET, MySQL, Redis, Minio, Evolve, ELK, Sentry, Prometheus, Grafana, MailKit, Twilio, SendGrid, Kafka, xunit, Moq, Fluent Assertions, Gitlab, Terraform, Vue 2, TypeScript, axios, moment

Leading the team in charge of modernized clients private area for an online brokerage. Main achievements: ● Rebuilt registration workflow (was in legacy system). ● Provided architectural input and fixed multiple bugs for new authentication service. ● Rebuild document verification (was in legacy system). ● Migrated documents from various legacy systems to centralized object storage. ● Implemented copytrading in the system – including payment request handling and CRM display. Regular activities: ● Part of a platform team - maintaining foundational libraries other developers use (metrics, notifications, object storage, etc.). ● Part of an architectural committee meetings that advise on how to gradually move off legacy services. ● Code reviews. ● Speed optimization in various services. ● For an earlier project I did fullstack work in Vue.js and TypeScript. ● For recent projects, frontend tasks are done by a separate team.

Senior Backend Developer

05.2017 - 11.2019 |Tinkoff.ru (one of the biggest financial institutions in Russia)

ASP.NET MVC 5, WebApi 2, JQuery, Twitter Bootstrap, IIS, Nginx, Entity Framework/ Dapper, SQL Server, Elasticsearch, Kibana

Developing several projects for small business’ private area: ● Set of microservices built with ASP.NET Core, Postgresql, Redis, Kafka, MongoDb; writing e2e tests in Typescript with Jasmine. ● ASP.NET MVC 5, WebApi 2, JQuery, Twitter Bootstrap, IIS, Nginx, Entity Framework/Dapper, SQL Server for data storage, integrating with various internal systems for authentication/authorization and getting new data (HTTP or async messaging). setting up TeamCity builds for one-click releases to test and live environments. ● Messaging solution - Scala 2.12, Slick to access Postgresql, akka-http, integrating with push notification provider via Kafka, IBM MQ, Redis + Infinispan for storing session cache, Monix, Play json, akka streams, ScalaTest for writing unit tests. ● Gained rather good Postgresql knowledge including how it internally handles things like MVCC and vacuum, plus basic pgbouncer setup common project infrastructure -Elasticsearch, Kibana, elastalert, filebeat for logs management, setting up Grafana dashboards

Backend Developer

06.2015 - 05.2017 |Apostol

Couchbase, Elasticsearch

● Developed monitoring system for mass media and social networks - integrating with external services for loading data. ● Supporting data processing system built with TPL Dataflow. ● Writing code for site backend. ● Helping perform some administrative tasks (because I was curious) - migration and expanding Couchbase, Elasticsearch clusters. ● Setting up periodic backups. ● Writing Powershell scripts to deploy background services and web applications.

Backend Developer

10.2013 - 05.2015 |SyncCloud

ASP.NET MVC, Web API, Dapper, Redis, Amazon Web Services, Calendar, Storage, TimeZone

● Developing task and project management system using ASP.NET MVC, Web API, Dapper, Redis, Amazon Web Services. ● Integrating with Google services - Calendar, Storage, TimeZone. ● Writing unit and integration tests. ● Continuous code refactoring. ● Writing release scripts. ● Load testing using Yandex Tank tool. ● Built an authorization service prototype that used Neo4j as underlying datastore. ● Separate team handled frontend development.

Web Developer

01.2012 - 10.2013 |Europlan (one of the largest privately-held car leasing companies in Europe)

ASP.NET MVC/Web API, Entity Framework, SQL Server 2012, Knockout, Angular, TeamCity, RabbitMQ

● Developed several systems that help automate interval business-processes (mainly for car leasing and insurance) using ASP.NET MVC/Web API, Entity Framework, SQL Server 2012, Knockout and Angular. ● I took part in developing current version of a public website, leasing.ru. ● I’ve set up TeamCity for continuous integration and deployment and communicated with 3rd party services using RabbitMQ message broker.

Software Developer

05.2010 - 10.2011 |Startup developing document workflow application

.NET 4.0, WPF, WCF, Windows Azure, Entity Framework 4, Managed Extensibility Framework (MEF), Visual Studio 2010, Team Foundation Server 2010, SQL Server 2008 R2, Expression Blend 4, Windows Azure SDK, ASP.NET MVC 3, TPL (Task Parallel Library)

While developing a system I’ve gained experience in developing projects from the ground-up, designing user interface, working on functional requirements for various system components, developing architecture of a distributed application, optimizing data access code so it can scale to higher load. ● Designing user interface in Expression Blend 4. ● Writing and extending UI logic using MVVM pattern. ● Developing web services using WCF and Windows Azure SDK. ● Designing data access code. ● Evolving application architecture using Inversion of Control principle with StructureMap and MEF. ● Web application development using ASP.NET MVC 3, Entity Framework, Windows Azure.

Software Developer

12.2008 - 05.2010 |Moscow State University of Economics, Statistics and Computers

ASP.NET, MS SQL Server 2008, ADO.NET, LINQ

● Support and feature development of a website providing access to students and teachers regular and exam timetable; refactoring, applying new technologies.

Educational background

Specialist

Till 2011

Moscow State University of Economics, Statistics and Computers

Languages

EnglishUpper Intermediate