Renovating enterprise behemoths into nifty microservices.Turning a millions of lines of legacy monolith codebase into set of distributed highly available soft real-time microservices of all sorts and trades: multimaster clusters, active/hot-standby clusters. Cross datacenter, eventually consistent data flow and replication development and optimization, building in-memory indices, debugging tricky multi-threading bugs, running complex post-mortem investigations spanning multiple services, building libraries that boost developer productivity.Digging deep into memory dumps, flame graphs and thread dumps and business logic. Diving head-first into unknown codebases and getting rid of tech debt. Turning high load into no load by using of correct data structures, data transmission/encoding protocols and database denormalization. Adapting and extending existing open-source frameworks for improved fault tolerance.Planning and executing work as a team effort, documenting, helping teammates and other teams

As part of a small team that handles all of their needs, I was lucky to be able to help in every way I could and learn a lot from my teammates. As a software engineer:Rewrote mission critical legacy Supply Side Platform services using Java and Spring Framework: services were able to handle much higher load and generate more revenue. Worked on high load DSP (Demand Side Platform) node.js based distributed service that handled billions of events per month. Maintained Apache Spark based conversion matching engine and various data pipelines including AWS Kinesis, Apache Kafka, AWS Redshift based reporting OLAP solution.As a devops:Managed server provisioning using Ansible, bash and python, SQL/NoSQL database deployment and configuration, handled Apache Kafka cluster upgrades and rebalancing. Provisioned and configured the observability stacks: ELK, Telegraf, Graphana and Kibana. Ran A/B tests in production and software deployments.

Led a compact team of software engineers working on various long and short term projects:Developed Legal mitigation support software using a mix of Java, Spring Batch, PHP, Elasticsearch and Ember.js. Lead development of Android and iOS mobile apps with Play Framework backend.Worked alongside with the team on projects using Salesforce, Magento, Node.js.

Developed Voter Registry application using Java, Swing and Postgres and old-time IE6-optimized websites using PHP/JS.

A freelance side job I've done using Wordpress :)

Developed Joomla extensions using PHP and Javascript