Vadim Tsvetkov

Well-known energy provider migrates its public and backoffice services into AWS. My work on the project: * AWS cloud infrastructure, IaC automation (Terraform, Hashicorp Nomad cluster, Harbor, Consul, Aurora MySQL DB) * Security compliance (IAM keys, Image scan, DB and S3 permissions, ProxySQL, SSM tunnel, Azure VPN) * System observability (Splunk, Grafana, Cloudwatch, Canaries, Lambda, MS Teams alerts, 3rd-party monitoring tools) * CI/CD and GitOps (Gitlab, pipelines, Jenkins, Docker, AMI)

The client develops and operates online shops selling mobile phones and plans. The shops are migrated to AWS with as many services replaced by AWS managed services as possible. My tasks included architecture and implementation of the target AWS infra. * AWS cloud infra, IaC (Terraform, CDK, Helm, VPC, A/NLB, Kubernetes EKS, Aurora Postgres SQL, Opensearch, RabbitMQ, ElastiCache Redis) * System observability (Prometheus, Grafana, Cloudwatch) * CI/CD and GitOps (Argo CD, Gitlab, Docker, AWS ECR, MS Teams)

via Toptal, US. Client's big data platform for creation of digital twins. These AI-powered models of real devices bring value to B2B clients by providing real-time monitoring and ease of development of their systems. My devops and dev tasks are: * AWS infra, IaC (Terraform, CloudFormation, Helm, VPC, EC2, Kubernetes EKS, Kafka) * CI/CD (Jenkins, Docker, AWS ECR, Slack) * Big Data DBs (Scylla, DynamoDB, MySQL) * Micro-services and API (Java, Spring, Scala, REST) * ML and streaming jobs (Spark, Flink, H2O)

via Toptal, US. Client develops force plate hardware and AI/ML software to diagnose body movement health of military, sports, medical or occupational users in diff. countries. I provide design and maintenance of cloud architecture on multiple AWS accounts with client's software. * IaC (Terraform, AWS, Docker) * CI/CD (CircleCI, Github, Docker, ECR) * AWS (CloudFormation, Route53, ECS, Lambda, Aurora, Postgres, VPN, AWS Glue) * Restrictions for mil/gov cloud (FIPS, TLS, S3, Docker registry)

The client develops new insurance products and online apps that capacitate them. These tools benefit from the latest tech. in a micro-services landscape, and are cloud-ready from the start. Build, deploy and connect these apps are tasks of the "infrastructure as code" (IaC) developed by me. -IaC (Jenkins, GitHub, Docker, Kubernetes) -Separation of concerns of devs and infr. (IaC repos) -Auto CI/CD (GitHub, webhooks, Nexus, Docker, NPM, Jenkins, Nginx, Node/Express/React.js) -AWS & OpenShift clouds

The client ports their insurance software and infrastructure to the Amazon Cloud. * IaC (Groovy 2.5, OpenShift 3.9, Docker, Kubernetes, Jenkins 2, GitHub, Git, Maven 3.5) * Jenkins Pipelines (Groovy, scripted, declarative, shared libs, custom DSL) * AWS RDS (Microsoft SQL Server 2014, SQL script) * Guidewire InsuranceSuite (Claim Center, Policy Center, Document Composer, Java, Gosu) * Security (DB encryption, secrets management) * Resilience (session stickiness, data replication, Chaos Monkey)

The client transforms its software landscape with cloud technologies and workflows. My work: -Software update (Java8, SpringBoot, Maven, WebSphere WLP 17, AJAX, JavaScript) -Cloudification, containerization, orchestration (Jenkins, AWS, OpenShift 3, Docker, Kubernetes, Cloud Foundry) -Security (TLS 1.2, Egress, JWT, Secure Cookies) -Fail safety (Apache Ignite, session persistence) -Monitoring and diagnosability (Dynatrace, ELK: ES-Logstash-Kibana) -Coop with business, DevOps and backend Teams

My work: - Concept and realization of the new Java web apps: new enterprise homepage and end customers portal (Java 7..8, J2EE6 + Weld 2.4, Servlet 3, Apache Wicket 7.5, Elastic Search 5.1, Tomcat 7, Apache Server 2.4, Maven 3). - Creation of the new UI and UX concept for the existing apps; dev. of a reusable lib. of frontend components (Wicket 7.5, HTML, CSS, JavaScript+jQuery, AJAX, Bootstrap 3, Responsive Design). - Test driven dev. - Support and consulting in the IT team.

Work on this project includes: -Java web dev, full-stack (Java 7..8, Hibernate 3, Spring 3, JAXB 2, IBM DB2 iSeries AS/400, Tomcat 7, Apache HTTP Server 2.2..2.4, Maven 3) -Refactoring of legacy code -Web frontend (JSF 2, MyFaces 2.2, Apache Tomahawk, HTML, CSS, jQuery) -Real-time services performance (SOAP, Apache CXF 3, Apache Axis2) -PDF generation (Jasper Reports 4.7, iReport Designer) -Backend & frontend tests, TDD (Junit 4, Mockito) -Support for the internal Allianz deps and partners

This project involves development of the web interface for the O2 service resellers. This is a web application based on EJB3 and Wicket. My responsibilities are: • Development and testing of the application, full-stack (Java, EJB, JPA, JAXB, Wicket, JBoss, Maven, JUnit, HTML/CSS, Javascript, jQuery, AJAX, cross-browser Webkit, Firefox, IE, Android & iOS touch devices) • Development of a custom load test platform (JSoup) • Being part of the Scrum development process (Jira, Confluence, Hudson)

The client company deals with copyrights and royalties for musical content. This project consists of several web apps meant to eventually replace existing old system. The implementation is based on Spring, Hibernate and Wicket. My responsibilities: —Application development, front- and backend (Java 6, Wicket 1.6, Spring, Hibernate, Tomcat 7, MS SQL Server, Maven, Gradle). —Web GUI integration. —Wicket coaching. —Test driven dev (JUnit, Mockito). —Agile dev process, Scrum master (Jira, Confluence).

This project involves development of the web interface for the O2 service resellers. This is a web application based on EJB3 and Wicket. My responsibilities are: • Development and testing of the application, both frontend and backend parts (Java, Wicket, JBoss, Maven, JUnit, HTML/CSS, Javascript, jQuery, AJAX, cross-browser compatibility Firefox, Internet Explorer). • Porting of the frontend from HTML to Android 3.1+ for handhelds. • Being part of the Scrum development process (Jira, Confluence, Hudson)

The goal of this internal company project is creation of rich Java components - building bricks used in development of company’s publicly available online software products. My tasks include the following: • Architecture and implementation of the frontend component library (Java, Wicket, Tomcat, Maven, JUnit). • Scrum process (Jira, CruiseControl). • Consult the team on Apache Wicket development. • Client-side representation of the product (HTML/CSS, Javascript, jQuery, AJAX).

Development of the innovative ASP solution for telecommunication service resellers. The product serves as a convenient interface between providers and resellers and features web-based GUI, user-defined workflow, multi-client access, phone number management, etc. I was working on the following items: • Architecture and development of the frontend layer (Java, JSF, HTML/CSS, Javascript, AJAX, Spring, Hibernate, Oracle, Apache Tomcat) • Connecting frontend with Hybris PIM and Commerce func. (Java, Hybris, X

Frontend development for the internal sales tool of the company. The tool consists of several web applications. It has been planned to completely rewrite their web frontend to unify the look and feel, make them more user-friendly, responsive and feature-rich. My services in the project include: • Architecture of the new frontend layer • Frontend development (Java, Apache Wicket, HTML/CSS, Javascript and JQuery, AJAX, Spring, Hibernate, BEA WebLogic) • Consulting BT employees on Wicket, Javascript, AJAX

Technical consulting at Denkwerk outsourced by Walbusch to create two more Hybris stores as an extension of the already existing one (see the next paragraph) for their daughter companies (Mey&Edlich, Avena). My services in the project include: • Consulting the Denkwerk developers on the different aspects of the Hybris platform • System architecture of the new store extensions • Backend dev. needed to extend the existing store func. to convert it into a multi-store environment (Java, MySQL, Hybris, XML).

Project for an online store for the German apparel for seniors called Walbusch, based on the online commerce framework licensed from Hybris AG. a) From-scratch implementation of the import-export module that handles the store catalog data Java,Hybris,XSLT,XML,Castor,JDOM; b) Business layer architecture involving extension of the Hybris API classes Java,Hybris; c) Backend dev.: order processing, user management, etc. Java,Tomcat,MySQL; d) Frontend dev. with close cooperation with designers JSF,MyFaces.

Development of the full-circle document management application for a radiological clinic: from doctors submitting reports to the system to patients having online access to it. My work for this project included: • System architecture • Switching the project workflow into the test-driven development • Server-side development (Tomcat, Jetty, Apache, Java, Spring, Hibernate, Ruby on Rails, Oracle) • Client-side development (HTML for IE, Firefox, Safari, Velocity, CSS, JavaScript, AJAX)

Provider of the personal assistant software that gives users mobile or online access and a possibility to exchange their personal information such as contacts, calendars and notes: a) System architecture; b) Server side dev. on several application servers J2EE,Tomcat,WebSphere Oracle,XML c) Client side dev. for many different mobile devices J2ME,HTTP,WAP; d) Web front-end dev. Java Servlets,JSP,HTML,XML,XSL/XSLT; e) Integration with enterprise directory services MSExchange,LDAP servers,JNDI.

A start-up company developing online conferencing software with application data synchronization (via Internet) and voice transfer (via PSTN): a) Front-end dev. for online conf. software, communicating to backend via XML; b) Java applets and servlets; c) Integration with Lotus Notes and Lotus Sametime (using HTTP); d) Concept design and thorough functional description of integration with MS Outlook (custom forms), with and without use of MS Exchange e) Connecting to Oracle database.