Tymofii S.

Senior Java Developer / Architect

Avatar placeholder
Karlsruhe, Germany

Experience

Aug 2022 - Present
3 years 5 months

Senior Java Developer / Architect

Modirum

  • Software design and implementation of 3-D Secure payment protocols
  • Created a Spring Boot–based distributed solution for processing, handling, and distribution of large amounts of data: card ranges from Visa, MasterCard, AMEX, etc.
  • Architectural solution for self-hosted and client-hosted setups including Kubernetes-based platforms
  • Set up development, release, and delivery processes from scratch
  • Tech stack: Java 8, 11, 17, Spring Frameworks, Maven, Ant, AWS, Azure, Kubernetes, Prometheus, Tomcat, Docker, gGRC, REST, JWT, IAM, Jenkins, GitHub Actions
Jul 2021 - Jul 2022
1 year 1 month

Senior Java Developer

Targens / MySaveID

  • Implemented service-based architecture using the Spring stack
  • Integrated with blockchain networks: Ethereum, Corda, and Indy; set up a blockchain network on Kubernetes infrastructure
  • JWT-based authentication with Keycloak and Spring
  • Tech stack: Java 17, Spring Frameworks, PostgreSQL, Maven, Azure, Microservices, Kubernetes, Helm, Docker, Prometheus, R3 Corda, Indy, Ethereum, REST, JWT, IAM
May 2018 - Sep 2018
5 months
Germany

Full-Stack Developer in Test

Aura Labs

  • Full-stack developer role in a very dynamic startup
  • The startup is about creating a global recruitment network for developers and launching a coin that could become a payment method for this network
  • Set up Kubernetes infrastructure on Google Cloud from scratch
  • Tech stack: Node.js, Vue, MongoDB, Redis, Kubernetes
Jan 2016 - Jun 2021
5 years 6 months
Karlsruhe, Germany

Full Stack Java Developer

Tipico

  • Implemented both user-facing and backend software for Tipico shops
  • User registration flow including full KYC and integration with Signotec signature pads
  • Developed a legal tracking and reporting system that retrieves customer details for anyone entering the shop
  • Integrated face-to-face and TOTP-based payment solutions for retail
  • Connected customer-facing applications with external payment providers like PayPal, Neteller, and Wirecard for online customers
  • Implemented KYC and AML requirements
  • OAuth2 server-side implementation
  • Authentication and authorization following OAuth2 standards using authorization code, client credentials, and password flows across microservices and user-facing applications
  • Full-cycle software development: architectural design, prototyping, scaling, high availability, and monitoring
  • Built a service handling 2,000+ requests/sec with 2–4 ms latency for 99% of requests
  • Developed a sanity-check ReactJS/Spring-based application for a 100+ service/legacy stack
  • Introduced a Software Developer in Test role across the company and elevated quality assurance and end-to-end responsibility in different Scrum teams
  • Coached developers on unit/integration testing and TDD
  • Java development as a team member and continuous delivery
  • Performance-focused design and testing
  • Test automation following the Test Pyramid approach
  • Tech stack: Java 6, 8, 12, Spring Frameworks, Maven, Python, AWS (S3, Lambda, CloudWatch, IAM), Microservices, Kubernetes, Helm, Prometheus, Redis/ElastiCache, MariaDB, Kafka, JSON-based APIs, Swagger, Reactive WebClient API, ReactJS, TypeScript
Apr 2015 - Dec 2015
9 months
Kyiv, Ukraine

Java Developer in Test

Traveltainment (via Amadeus Ukraine)

  • Test organization and implementation at all application layers
  • Test-based continuous integration
  • Bug fixing
  • Tech stack: Java 8, MySQL, WildFly, Weld CDI
Apr 2014 - Mar 2015
1 year
Kyiv, Ukraine

Java Developer

Kuoni DestinationManagement (via Ciklum)

  • Design, develop and test software following standard software development processes
  • Development and unit testing of applications
  • Tech stack: Java 6,8, Oracle DB, Spring 3 and 4, Hibernate, ActiveMQ
Jul 2012 - Mar 2014
1 year 9 months
Kyiv, Ukraine

Senior Test Automation Engineer

Kuoni DestinationManagement (via Ciklum)

  • Pair programming with developers
  • Test and Software design
  • Test Automation and code review
  • Performance testing
Nov 2011 - Jul 2012
9 months
Kyiv, Ukraine

Senior Test Automation Engineer

Redcats (via Ciklum)

  • Have created, integrated andmaintained automation test framework based
  • Test automation patterns: Page Object, DSL
Aug 2010 - Oct 2011
1 year 3 months
Kyiv, Ukraine

QA / Business Analyst

N2V (via Ciklum)

  • Full Cycle Quality Assurance
  • Acceptance criteria definition
  • Release management , deployment and demo
  • Test/Staging/Prod environment administration
Jul 2007 - Jul 2010
3 years 1 month
Dnipro, Ukraine

QA / Test Manager

IOIX-Ukraine

  • Testers Teammanagement (4 members)
  • Technical interviewing to candidates for “tester” positions
  • Test plans and test suites development
  • Test cases review
Nov 2006 - Jun 2007
8 months
Dnipro, Ukraine

QA

Soft-Ukraine

  • test cases development and execution

Summary

Ambitious Java Developer with 15+ years in industry versed in following established procedures and working under little or no supervision. Offering technical expertise in programming analysis, application analysis and design. Excellent team player with in-depth knowledge of development tools and languages.

Languages

German
Advanced
English
Advanced

Education

Oles Honchar Dnipro National University

Master's degree in Engineering Physics · Engineering Physics · Dnipro, Ukraine

Need a freelancer? Find your match in seconds.
Try FRATCH GPT
More actions

Similar Freelancers

Discover other experts with similar qualifications and experience

Werner K.
Werner K.

Test Coordinator, Designer and Engineer

View Profile
Dirk B.
Dirk B.

Senior Software Developer

View Profile
Michael K.
Michael K.

Software Developer

View Profile
Jan M.
Jan M.

Founder, Senior Solution Architect, TeamLead, Senior DevOps-Engineer

View Profile
Jürgen F.
Jürgen F.

AR/VR/XR Architect

View Profile
Michal B.
Michal B.

Senior Golang Engineer

View Profile
Ales L.
Ales L.

Senior DevOps Consultant (Freelance)

View Profile
Thomas R.
Thomas R.

Architect, Developer

View Profile
Jan L.
Jan L.

Development of a web application in geolocation and speech-to-text

View Profile
Thomas H.
Thomas H.

AR App

View Profile
Cornelius H.
Cornelius H.

Solution architect

View Profile
Timo R.
Timo R.

Expert Software Developer

View Profile
Niklas W.
Niklas W.

AI Engineer, Cloud Solution Architect, Backend Developer

View Profile
Andreas K.
Andreas K.

Senior Developer

View Profile
Collin K.
Collin K.

Software architect / Fullstack Developer

View Profile
Ulrich C.
Ulrich C.

Java Architect/Developer – Freelancer

View Profile
Benedikt B.
Benedikt B.

Implementation of a Time Tracking Software

View Profile
Shamaila M.
Shamaila M.

Senior Software Architect

View Profile
Stefan B.
Stefan B.

Senior Full Stack Developer / Co-Founder / CTO / Head of Development

View Profile
Jan M.
Jan M.

Proof-Of-Concept

View Profile
Christof N.
Christof N.

Senior Developer

View Profile
Thomas J.
Thomas J.

Senior Fullstack Developer

View Profile
Rangel S.
Rangel S.

Lead Software Engineer / Software Architect

View Profile
Kai K.
Kai K.

OpenAI Integration

View Profile
Michael F.
Michael F.

Freelancer, Solution Architect

View Profile
Damian Ś.
Damian Ś.

CTO

View Profile
Leif S.
Leif S.

Freelance IT Consultant and Software Architect

View Profile
Marcel M.
Marcel M.

Data Scientist, AI Engineer, Senior Solution Architect

View Profile
Albert F.
Albert F.

Lead Product Owner

View Profile
Andreas S.
Andreas S.

Lead Developer

View Profile