Stanislav [no bot] K.

This company is a crypto wallet deliver to users aviability to use crypto currency for daily payment as simple debit card, so you can pay everywhere you want like usual MasterCard. As Technical Lead I create and implement architecture most critical services in the system. For instance, service that detecting transactions in blockhain. It is highly concurrent app used structured concurrency (coroutines and non blocking IO), it has extremely low latency and fault tolerance. Nice thing is this service works faster than analogues in most popular crypto exhanges. I do a lot of researching job about how to better interact with Solana blockhain and integrate it in the best way with our system. Responsibilities: - Design and implement service architectures - Delivering features from idea to production - Solving none trivial tasks and problems. - Technical interview and selecting new developers for the project. - Team management Our stack: Kotlin / Rust, PostgreSQL, Kafka, kubernetes, Solana blockhain

Company has it's own product to provide assistance to marketing departments of huge international companies in conducting marketing research and structuring the already accumulated research results The over all team are hundreds people working on the platform. I was designing and implementing business tasks along side an architectural rebuild. I did Domain Model extension, than come up with the API contract, execute the contract with my team and deliver through the continuous integration pipeline to production. I was working on refactoring and performance optimization of financial service, as result service started work faster and code changed to more readable and clear. The target technological stack is: Spring (Core, AOP, Web) Hibernate + direct jdbc Hezelcast for caching Gradle for buidling Existing technology stack GWT as the UI layer Jboss + EJB3 as the business layer Postgres as the persistence layer accessed using hibernate

The company worked on marketing market and main product was advertise system. As Head of Engineering I created architecture and built main modules that can handle a huge amount of traffic (15000 rps to one server). Main responsibilities: - Coordinating product strategy with CEO. - Managing backend, frontend, mobile and testing department - Development workflow control - Problem statement, task management/tracking - Developing scalable core of advert network - Performance profiling and optimization. - Creating autotests - Code review - Implementation new features - Using DDD - Selection of candidates, personnel training We use these technologies in our core: - Java 8 - Play Framework 2 - JPA (Hibernate) - Jongo (for MongoDB) - MySQL, MongoDB, ClickHouse - Async computation - Algorithmic optmization - Off-heap memory for some critical places and these technologies for internal control panel: - PHP 7 - Laravel 5.6 - MySQL, MongoDB, ClickHouse Also all our infrastructure based on LXD containers.