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Danila Tsitkin

Senior Java/Kotlin Lead Developer · since 2011

Team leading and technical coordination, Kotlin and Java backend and full-stack development, requirements analysis and feature design, work management and process setup, and Atlassian products and customizations.

  • IT services
  • Aviation and defense
  • Real estate
  • Energy, oil and gas
  • Trading
  • Insurance
  • Telecom
  • Automotive
  • ERP and CRM
  • eCommerce
  • Wellness
  • Consulting
daniel@famberlin.com

Projects

Each project is a branch off one main line, and projects that ran at the same time sit side by side. Pick one to follow its own story.

  1. main · today

  2. Trade identification and tracking system

    Lead Developer

    Identify and track about a billion trades a day for a Tier-1 US investment bank

    Regulatory system that assigns unique identifiers to trading operations, stores them and redistributes them to downstream analytics. It handled about 1 billion trade records per day, roughly 28,000 events/sec sustained across trading hours, with data persisted and queryable within 5 seconds of consumption to meet the regulatory SLA. Hands-on plus leadership.

    • Java 8/17/21
    • Jooby
    • Spring
    • JDBC
    • JPA
    • Hibernate
    • Jetty
    • Tomcat
    • Kafka
    • Solace
    • Oracle
    • Jenkins
    • Tekton
    • Kubernetes
    • Helm
    Explore project

  3. Insurance registration platform: monolith decomposition

    Team Lead, Lead Developer

    Split registration modules out of a monolith without stopping live operations

    Run in parallel with the eCommerce project, as backup lead and knowledge-transfer owner for the client's internal team. Registration modules were extracted from the monolith into standalone services one at a time while live operations continued.

    • Java 8/11/17
    • Spring
    • Hibernate
    • Tomcat
    • JBoss
    • ActiveMQ
    Explore project

  4. eCommerce microservices platform

    Tech Lead

    Lead the boiler domain of a 100+ microservice platform for a major UK retailer

    For a major UK plumbing and heating retailer, as Tech Lead for the boiler domain with a team of 6–10 developers. I took over the existing domain and grew it into a broader part of the platform: reworked its design and added a range of new domain branches, each designed and built as its own set of microservices and carried through launch and production support. Hands-on plus leadership.

    • Kotlin
    • Java
    • Spring
    • GraphQL
    • Apollo Server
    • Kafka
    • Algolia
    • PostgreSQL
    • Gradle
    • AWS
    Explore project

  5. Independent work

    Freelance Software Engineer

    Websites, accounting software and client projects as a freelancer

    Freelance engineering across web and backend projects, several of them for clients under NDA. Hands-on.

    • React
    • Next.js
    • Java
    • Kotlin
    • Spring
    • PostgreSQL
    Explore project

  6. Minefield mapping desktop app

    Team Lead

    Keep a poorly documented legacy desktop app stable to end of life

    Leading the team on an old, poorly documented codebase through its end-of-life phase. Mostly leadership.

    • Java
    • MS SQL Server
    Explore project

  7. Property booking platform rewrite

    Lead Developer, Team Lead

    Rewrite a legacy booking application from Java to Kotlin

    Took over support of a legacy property booking application, then designed and led its full rewrite in Kotlin. Leadership plus feature design.

    • Kotlin
    • Spring
    • MySQL
    Explore project

  8. Atlassian consulting

    Consultant

    Design, migrate and run Atlassian stacks for clients

    Consulting in a team of 4 on enterprise workflows, migrations and infrastructure for Atlassian customers. For one customer on Server licences I built a Data Center-style failover as a cost-effective alternative to a Data Center licence. Hands-on.

    • Atlassian Server
    • Atlassian Data Center
    • Atlassian Cloud
    • AWS EC2
    • EFS
    • RDS
    • CloudWatch
    • Route 53
    Explore project

  9. Used-car history and pricing portal

    Lead Developer → Team Lead

    Vehicle history pipelines and reports in a locked-down client environment

    Batch processing and reporting for a used-car history and pricing portal, delivered under strict client security controls. Hands-on early, then leadership.

    • Java
    • Kotlin
    • Spring
    • PostgreSQL
    Explore project

  10. Dating and date-planning web app

    Lead Developer

    The team's first all-Kotlin greenfield project

    A greenfield app and the team's first project written entirely in Kotlin, started around the Kotlin 1.0 release. Hands-on plus leadership.

    • Kotlin
    • Spring
    • MongoDB
    • AWS
    Explore project

  11. Mobile carrier CRM and analytics portal

    Tech Lead

    Maintain a legacy CRM monolith used by mobile carriers worldwide

    Maintenance and support of a legacy Java 6 monolith on virtualised Windows Server. Hands-on plus leadership.

    • Java 6
    • MySQL
    • MS SQL Server
    • OLAP
    • Windows Server
    Explore project

  12. Client Atlassian plugins and integrations

    Software Engineer → Technical Coordinator

    Custom plugins and integrations for Atlassian Server and Data Center

    Custom plugins, integrations and automation for clients on Atlassian Server and Data Center, typically 2–3 developers per engagement. Built in Java from 2014, with Kotlin adopted from 2016 after its 1.0 release. Hands-on plus coordination.

    • Java
    • Kotlin
    • Atlassian Platform
    • Spring
    • Active Objects
    • Hibernate
    • MySQL
    • PostgreSQL
    • JavaScript
    Explore project

  13. Health and wellness platform

    Lead Developer, Technical Coordinator

    User management, translations and reporting, solo then as lead

    For a health and wellness company. I was the sole developer for the first years, then Lead Developer and Technical Coordinator of about 4 developers, hands-on throughout.

    • Java 8
    • Play Framework
    • Scala Templates
    • Hibernate
    • jQuery
    • JavaScript
    • .NET
    • Azure SQL
    • AWS EC2
    • Route 53
    • JasperReports Server
    • Bamboo
    • TeamCity
    Explore project

  14. Internal Atlassian platform and Jira core fork

    Java Developer → Tech Lead, Team Lead

    Run a patched Jira fork behind company-wide accounting and billing

    Maintained and extended the company's internally patched, on-premise Atlassian stack, keeping the platform behind company-wide project accounting and billing reliable for about 1,000 staff, growing to 2,000. The team grew from 3 to 10. Hands-on, then leadership.

    • Java
    • Atlassian SDK
    • OSGi
    • WebWork
    • Velocity
    • Jira Server
    • Confluence
    • Bitbucket Server
    • MS SQL Server
    • Active Directory/LDAP
    • Bamboo
    • Jenkins
    • TeamCity
    • Maven
    • Git
    Explore project

  15. Network port management tool

    Java Developer

    Map, monitor and lock down Ethernet wall ports across office floors

    An internal web tool for the network team, built as the sole engineer, to map, monitor and configure Ethernet wall ports, switches and connected devices. It replaced manual network audits with live port visibility and shortened setup during floor relocations.

    • Java 7
    • GWT
    • SNMP
    • PostgreSQL
    • Tomcat
    • Maven
    • SVN
    Explore project

  16. Oil and gas data management desktop app

    Junior Java Developer

    Validated spreadsheet imports into SQL Server for energy-sector analysts

    A desktop client, built as the sole engineer, for energy-sector analysts to import, view and edit company data from spreadsheets into MS SQL Server. It replaced manual spreadsheet updates with validated database imports, reducing entry errors and daily file handling.

    • Java
    • NetBeans RCP
    • Swing
    • MS SQL Server
    • Hibernate/JPA
    • JDBC
    • OpenCSV
    • Maven
    • SVN
    Explore project
  17. 2011 · first commit

Skills

Languages
  • Java
  • Kotlin
  • Groovy
  • Clojure
  • Scala
Frameworks and libraries
  • Spring Boot
  • Spring Core
  • Spring Data
  • Spring MVC
  • Spring Security
  • GraphQL
  • Hibernate
  • Jooby
  • JUnit
  • SLF4J
  • Play Framework
  • TestNG
Java platform
  • Collections
  • Multithreading
  • IO/NIO
  • JDBC
  • JPA
  • Servlets
  • JSP
  • JSF
  • EJB
Tools and infrastructure
  • Kafka
  • Maven
  • Gradle
  • SonarQube
  • Tomcat
  • ZooKeeper
  • IBM WebSphere
  • Google Guice
  • ActiveMQ
  • RabbitMQ
  • Jersey
  • WebLogic
Databases
  • PostgreSQL
  • Oracle
  • MySQL
  • MS SQL Server
  • Redis
  • MongoDB
  • SQLite
Web and platforms
  • Linux
  • Windows
  • GWT
  • Android
  • Angular
  • macOS
  • iOS

Dots: 5 expert · 3 periodic use in commercial projects · 1 basic theory

Education

  • BS in Technology

    Belarusian National Technical University, Minsk · 2012

Certifications

  • Atlassian Certified Jira Administrator for Data Center

    Atlassian · 2018

  • Atlassian Certified Jira Service Desk Administrator

    Atlassian · 2018