Denysov Kostiantyn

Leading high-impact initiatives and mentoring engineers to drive scalable backend architecture and operational excellence.

• Architecting resilient systems and APIs to support growing business needs
• Driving platform reliability and leading engineering best practices
• Collaborating cross-functionally to align technical solutions with product vision

Enabling engineering teams to ship confidently by refining processes, mentoring, and fostering a culture of ownership.

Designed and developed scalable backend services, ensuring system performance and security.

• Built and optimized APIs and data pipelines to support product requirements
• Improved team efficiency by standardizing development workflows
• Ensured compliance with architectural standards and code quality guidelines

Delivered high-quality backend solutions by proactively identifying performance bottlenecks and collaborating with stakeholders.

Contributed to building copyright protection solutions by developing and maintaining core services.

• Designed modular backend components to enable fast feature delivery
• Optimized existing services to increase system reliability and maintainability
• Collaborated closely with QA and product teams to ship robust features

Played a key role in architectural planning and continuous performance improvements.

Designing, developing and installing software solutions, support and develop software team.

• Develop software solutions, like API, software designing, etc.
• Implementing systems flow, data usage, and work processes
• Following the software development lifecycle

Determine operational feasibility by evaluating analysis, problem definition, requirements, and proposed solutions.

Built a multichannel payment system enabling small businesses to automate and simplify bill payments.

• Integrated ACH and Payoneer to extend payment capabilities
• Implemented supplier communication workflows via single-click actions
• Enhanced internationalization by adding Unicode and UI improvements

Delivered secure, scalable backend services improving transaction efficiency and user experience.

Developed smart search and recommendation systems for personalized travel bookings.

• Built full-stack features using JS/TS, Angular, React, Node.js, and Swift
• Integrated search analytics to enhance conversion rates and user engagement
• Maintained scalable and testable codebases across multiple platforms

Delivered end-to-end technical solutions aligned with travel business goals.

Delivered web applications and APIs for early-stage projects across data, events, and ticketing sectors.

• Designed scalable frontends and REST APIs for B2B and B2C platforms
• Collaborated with startup founders to build MVPs under tight deadlines

Enabled clients to validate product ideas quickly with maintainable codebases.

Migrated enterprise applications from Angular to React, improving UI performance and code maintainability.

• Modernized legacy frontend systems for beacon analytics platforms
• Collaborated with cross-functional teams to enhance product delivery velocity

Contributed to delivering responsive and high-performance web applications in the IoT domain.