Roman Roshchin

Description: Joined a team of SDETs with a vision to bring a more structural approach to software development, organize development practices, apply programming best practices, improve scalability and code maintainability based on 10+ years of experience. Started from code organization, introduced modularity, shared functionality, successfully applied these practices. Continued with writing a subsystem that checks and brings a set of devices to the desired state before running a series of tests on them, made the subsystem scalable, so it could be applied to any device models in any environment. Replaced a static-timer-wait approach in multi-device tests (e.g. calling, group calling, etc.) with an event-based approach, significantly improving tests reliability and performance. Participated in creating internal “Standards and Conventions” that should be applied to automated tests. Have been doing continuous refactoring and improving code readability, hands-on code reviews and mentoring less experienced developers, teaching SDETs java programming best practices. Participated in the software design of new project features and PoC subprojects
Technologies: Java, TestNG, Appium, Spring, REST, JUnit, JMS, Android, ADB, WebSockets, Jenkins
Position: Senior Software Engineer
Roles: Senior Java Developer, Mentor

Description: Joined the team at a very critical moment of time when previous vendor has abandoned any support for a complex hotel managements system, stabilized the project in first six months, and developed a set of new features as well as technological upgrades of the existing system in next six months. For the project, that is a set of systems: Hotel Chain Website, Booking Engine, CMS, Admin Portal, 3pty services integration components (Booking.com, Expedia, Maestro, Oracle OPERA, etc.)Created design and architecture for new system components and their interactions with the existing project. Introduced code quality standards to the project and trained the team to follow them, actively participated in code reviews and team collaborations. Made performance review of existing web services and improved overall performance (x10 faster) and stability. Upgraded project components to recent versions of dependencies including JDK. Covered the existing modules with tests, drastically increasing test coverage and stability of the system.
Technologies: Java, Spring, Hibernate, REST, SOAP, MySQL, Liquibase, JUnit, Mockito, Docker, JMeter
Position: Senior Java Developer
Roles: Senior Developer, Software Architect

Description: Joined a project as a replacement position for another developer at the middle of the preparation for a database migration process. Quickly obtained required knowledge, updated and improved database (Cassandra to MariaDB) migration scenario, scripts and back-end services. Successfully migrated data to new storage in short window of 4 hours, analyzed and fixed data inconsistency issues. Made performance testing of old version of the system and compared it to the new values, also improved 70% of existing database queries, though improving user experience. After stabilization phase, implemented a set of new features, which allowed releasing new version of the product and attracting 3 times more users. Created project documentation. Added Jenkins pipelines for test and production deploy, which allowed to decrease deploy time from 30 minutes to 2 minutes.
Technologies: Node.js, MariaDB, Cassandra, Docker, Jenkins
Position: Senior Developer
Roles: Senior Developer

Description: As a lead developer participated in a set of meetings with a client to gather requirements and propose design and architecture for a set of microservices for integration with the client’s production environment. Investigated existing processes in Camunda BPM and proposed a way for integration with new microservices. After the design phase, in a team of four people, successfully developed and integrated four major components for authentication, validation, registration and further data processing. As part of the pilot part of the project demonstrated the ability to deliver high quality products in managed time, including proper sprint activities, ticket-tracking system, code reviews, unified code style, build procedures, continuous deployment, etc.
Technologies: Java and libraries, Spring, Docker, AWS Fargate, RabbitMQ
Position: Lead Developer
Roles: Solution Architect, Team Lead, Senior Developer

Description: In a group of 10 people, successfully participated in a Solution Design phase of a potential project. As a Software Solution Architect, designed an architecture and a complete development plan for a new social media platform. Actively participated in a requirements gathering phase with business owners, took part in functional specifications creation, and investigated possible solutions for given functional specifications. Presented technical documents to the client on meetings and technical sessions. Additionally, created a what-if cost calculator for a proposed solution. Technology stack of the proposed solution is Java (with frameworks like Spring and tools like FFmpeg) and AWS services (ECS, S3, RDS, ELB, Elastic Transcoder, SQS, etc.). The primary format of content is HLS.
Technologies: Java stack, AWS stack, HLS
Position: Architect
Roles: Solution Architect, Functional Analyst

Description: As a senior developer, designed and developed a standalone service for file conversions from proprietary YouTubeXml format to standard DDEX format. Implemented the service’s ability to be plugged in to an existing environment with low effort. Developed RESTful API and basic UI for uploading YTXML files (as file or text) and downloading a ready-to-use DDEX version. Additionally, implemented a basic authentication mechanism for a restricted set of users. Finally, integrated the solution with Apache Camel framework so that the service is able to work with ftp/sftp/local directories as data sources of YTXML files.
Technologies: Java8, Spring, Apache Camel, JUnit, Swagger
Position: Senior Developer
Roles: Solution Architect, Java Developer

Description: As a primary back-end developer in a team of four people, participated in creation of a hackathon project. The project represents an intersection of IoT and Blockchain technologies. The idea of the project is to create an application that is able to collect information about “green energy” produced by private houses (e.g. wind turbines or solar panels). As a primary back-end developer, created architecture of the solution. During 48 hours of coding, developed the product and presented it to the jury of the hackathon. Used Node.js technology with Ethereum as Blockchain and Solidity as a language for smart contracts. Additionally, integrated the application with AWS IoT service to support different kinds of “green-energy” devices. Implemented features like the ability to add new equipment to running system and connect it to the public Blockchain network. Also implemented a feature for users of the system to convert “green-energy” into internal Blockchain currency, which can later be used to buy goods from organic product suppliers.
Technologies: JavaScript, Node.js, AWS IoT, Ethereum, Solidity, REST, jQuery, BlockOne ID
Position: Developer / Architect
Roles: Architect, Node.js Developer

Description: As a tech lead of a small team of developers, designed and implemented a secure mechanism for money transfers and personal finance management system for a UK government organization. Created an initial version of architecture for fast delivery of the PoC version of a product to the market. Working with a team, developed a set of back-end services and UI that allow the government organization to transfer funds to recipients. Integrated the platform with banking APIs (ISO 20022).
As a lead developer, continued to improve the PoC version and create stable releases of the platform, so it went to production state. Improved the existing architecture of the platform. Developed many new features: the ability to manage money via mobile application, buy goods of a particular category in authorized stores via a custom POS terminal API, and transfer money to other users within the application.
Technologies: Java8, Spring, Spring Boot, PostgreSQL, Ethereum, web3.js, Solidity, Node.js
Position: Team Lead / Senior Developer / Architect
Roles: Architect, Java Developer, Node.js Developer, Team Lead, DevOps, Functional Analyst

Description: As a functional analyst and a senior developer, collaborated with a client to gather the list of functional requirements for a PoC product. Investigated the possible machine learning solutions and algorithms in order to use them to create and application. Implemented a system for sales prediction based on huge number of internal and external factors. With help of Apache Spark framework and MLlib library (Machine Learning) developed the PoC service that supports various types of Classification and Regression algorithms as well as different “what-if” scenarios to predict and classify different business counters.
Technologies: Java8, Spring Boot, Apache Spark, MLlib, Machine Learning, REST
Position: Senior Developer / Data Engineer
Roles: Java Developer, Data Engineer

Description: As a senior developer and a mentor for a junior developer, together developed a Java library for Excel-like spreadsheet calculations. Investigated multiple libraries and forked the Apache POI project. As part of the product, implemented additional features like Execution and Dependency graph for Cells or Workbook evaluation, Custom Functions with pluggable Data Sources for data (SQL, OData, Files, etc.). Covered the library with tests, including custom graph tests. Made several performance optimizations, so on some operations spreadsheets show better time than original Apache POI library. Configured and maintained sources and binaries to be publicly available as open source project.
Repository: https://github.com/DataArt/CalculationEngine
Binaries: https://mvnrepository.com/artifact/com.dataart
Technologies: Java8, Apache POI (fork), jGraphT, JUnit, Excel, JMH, JFR
Position: Tech Lead/Senior Developer
Roles: Java Developer, Tech Lead, DevOps

Description: As a developer in a team of 10 people, participated in development phase of a SaaS platform for RFP Evaluations. Developed back-end features like flow for managing ‘questions’ and ‘projects’ entities, assigning them to potential vendors for future surveys. Implemented a custom algorithm for scoring Q&A of RFP Evaluation project as well as module for project’s with graphical representation.
Technologies: Java8, Spring, Spring Security, PostgreSQL, Apache POI, REST
Position: Developer
Roles: Java Developer

Description: As the only developer, designed and implemented a Java plugin for an existing trading platform. Created client-server architecture based on Akka-remote for the plugin that listens to any market information from the trading platform and transfers this information to Excel files for future analysis. Integrated the plugin with the DDE technology to deliver data in ‘real-time’ mode to any running Excel application. Additionally, implemented support for source market data filtering and configured the production system in a distributed network with multiple Excel client applications.
Technologies: Java, Akka, DDE, Excel VBA
Position: Developer
Roles: Java Developer, Technical Writer

Description: As a developer in a team of 20 people, participated in development of a system that provides mechanism to perform analytical market assessments, market data delivery and distribution across subscribers around the world. Implemented features like market data management subsystem (prices, news, headlines, reports and other analytical data). Was highly involved in implementation of the system’s ability to be distributed across many geographical locations and guarantee full data integrity.
Technologies: Java, Hibernate, Spring, Spring MVC, Rhino, JavaScript, jQuery, Backbone, Liquibase, Go CI, Maven, Oracle DB, WebLogic, MarkLogic, REST
Position: Developer
Roles: Back-End Developer, Front-End Developer

Description: As a developer in a team of five people, participated in development of a Java module of Machine-to-Machine (M2M) Communication Framework. Implemented async requests feature, configured and tested distributed version of the module in collaboration with different modules.
Repository: https://github.com/devicehive/devicehive-java
Website: http://devicehive.com
Technologies: Java, J2EE, GlassFish, Hazelcast, PostgreSQL, WebSockets
Position: Developer
Roles: Back-End Developer

Description: As a back-end developer with some front-end experience, joined a team of front-end developers to create an HTML5 pluggable module for drawing landmark and building plans. Implemented and tested different UI features like chart navigation, zoom, drag-n-drop, etc.
Technologies: HTML5, SVG, JavaScript, CSS3, jQuery, RaphaelJs
Position: Developer
Roles: Front-End Developer

Description: As a developer with some free time, started a new pet project that is later was integrated with other internal services inside a company. Created an idea of social-network project with the ability to share pictures of personal workplaces with others and add spots with additional information. Implemented the idea as well as other features like POI – points of interest on a picture with rich text, comments and like actions. Additionally, implemented features like the ability to search and filter, and view a newsfeed.
Technologies: Java, MongoDB, Servlets, JSP, Maven, CSS3, HTML5, JavaScript, jQuery
Position: Project Lead
Roles: Developer, Architect

Description: In a small team, participated in development and maintenance of a Java library for integration with Siebel CRM. Developed different features that allow users to interact with convenient API and support quick process of development custom Java applications based on Oracle Siebel CRM. Proposed and implemented multiple performance improvements of the library.
Technologies: Java, Oracle Siebel CRM, Spring, TestNG, Easymock, JMeter, Jenkins, Ant, Cobertura, XStream, XPath
Position: Developer
Roles: Java Developer

Description: As a Full-Stack developer, implemented many features of an online shop for an Internet provider company. Participated in creation of architecture that uses a layer of SOAP services on top of Oracle Siebel CRM system. Developed API for features like billing, telecommunication services support provision, service provision ordering, etc.
Technologies: Java, jBoss SEAM, Apache CXF, Siebel CRM, Spring, TestNG, Easymock, SoapUI, Apache Tomcat, WebLogic, Maven, Jenkins, JSF, Facelets, Rich Faces
Position: Developer
Roles: Back-End Developer, Front-End Developer

Description: Started as an intern (and later became a developer), joined a team of 30 people to develop common functionality of a network-monitoring platform and additional services. Designed and developed many Management Agent products, which are plugins to the core system and used to monitor hardware/software devices across the network. Investigated open source and proprietary API and protocols from vendors like Nokia-Siemens, Motorola, Cisco, Alcatel and so on. In total developed more than 10 different Management Agents. Fixed bugs in more than 30 existing Management Agents. Participated in development of custom framework for TCP-based Management Agents, implemented its Telnet and SSH versions.
Technologies: Java, Spring, Hibernate, Proprietary Protocols and Libraries
Position: Developer
Roles: Back-End Developer