Олексій

Oleksii (Alex) Tkachenko
Java Backend Developer
Bratislava, Slovakia | [open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Experienced Java Backend Developer with 13+ years of commercial expertise building enterprise-grade
applications in the fintech domain. Strong technical foundation in Java, Spring Boot, REST APIs, and cloud- native
development (AWS), combined with proven team leadership and mentoring capabilities. Demonstrates hands-on
development proficiency, technical problem-solving skills, and the ability to establish engineering standards.
Currently focused on deepening Java expertise while leveraging modern development tools and practices to
deliver reliable, maintainable backend solutions.

TECHNICAL SKILLS
• Languages & Frameworks: Java, Kotlin, Spring Boot, Spring MVC, Spring Security, Hibernate
• APIs & Messaging: REST APIs, Microservices, Kafka
• Data: PostgreSQL, MySQL, Oracle, MongoDB
• Infrastructure & DevOps: Docker, Kubernetes, Maven, Gradle, Git
• Testing: JUnit, Mockito
• Practices: Performance Optimization, Production Support, Code Quality, Technical Leadership
• AI-Assisted Development Tooling: Anthropic Claude Code, Cursor, Copilot
• Fintech: Procurement & Strategic Sourcing, Invoicing & Billing Systems, Contract Lifecycle Management
(CLM), Budgeting & Spend Management, Source-to-Pay (S2P) Platforms

PROFESSIONAL EXPERIENCE
Provectus Inc. — AI Consultancy (long-term client project)
Java Developer — Hops (Internal Provectus Product) Since Nov 2024 – Present
• Hops is an internal employee resource allocation and project staffing platform designed to streamline
workforce management and project delivery.
• Contributed to an internal process automation project using Kotlin, PostgreSQL, and React, delivering
features that improved system efficiency and user experience.
• Involved in bug fixing, new features implementation, and performance optimization to enhance
system efficiency and reliability.
• Leveraged Anthropic Claude Code as part of an AI-assisted development workflow to improve
engineering productivity, accelerate code generation, and support day-to-day software development
activities.

Corcentric (formerly Determine) — Enterprise SaaS Platform for Fintech & Procurement
Team Lead, PHP Team — Corcentric Since Jul 2020 – Present
• Designed, developed, and maintained enterprise-grade backend applications and REST APIs for
financial systems, ensuring code quality, system reliability, and adherence to best practices.
• Investigated and resolved production issues through systematic debugging and optimization, improving
application performance and system stability. Owned hiring/interviewing, onboarding, and performance
reviews
• Led a PHP engineering team, scaling it from 5 to 12 engineers through hiring, onboarding, mentoring,
and performance management while maintaining technical collaboration across different fin-tech services.
• Managed work planning and prioritization across concurrent customer commitments
• Drove the delivery process end-to-end, owning quality and timelines across releases
 • Designed and implemented the integration with the remote fraud-check service on behalf of the product
development team
• Adapted and applied Unit testing for the customer specific layer of the custom PHP framework
Team Lead / Java Developer — Determine Nov 2018 – Oct 2020 | Team grew 6 → 9
• Combined hands-on Java/Spring Boot backend development with technical leadership for the Java team
• Maintained client specific features and customizations across 50+ US and EU customers
• Investigated and resolved production issues, improving application performance and system stability
• Set up standardized Git workflow adopted across the team
• Mentored engineers at various levels, supporting career progression and fostering a culture of technical
excellence and continuous learning
Java Developer — Determine Jan 2014 – Nov 2018
• Developed and maintained enterprise backend applications and REST APIs for financial systems
• Implemented new business functionality and integrated third-party services
• Optimized SQL queries and participated in production support
• Established standardized Git workflows and development practices that improved team collaboration
and became the organizational standard.
• Collaborated with product owners, QA, and cross-functional stakeholders to deliver business-critical
functionality and maintain service reliability
Managed Services Engineer — Selectica Dec 2012 – Jan 2014
• Supported financial platforms in production, resolving incidents in collaboration with development teams

TeleTec — independent employer, not affiliated with Provectus
Hardware Engineer May 2011 – Nov 2012
• Assembled, tested, and fixed telecommunication equipment

EDUCATION
Odesa National Academy of Telecommunications
Master's degree in Telecommunication Software Engineering

LANGUAGES
English (C1) • Ukrainian (native) • Russian (native) • Slovak (B1)