Mid-Senior Java Software Engineer (GR103-DV)

OKTO’s continuous growth demands high-caliber candidates who embody professionalism, passion, and creativity. For those who join us, we offer significant career advancement, stimulating challenges, and a clear runway for growth.

OKTO is the next-generation Payment Service Provider — AI-native, precision-engineered, and relentlessly merchant-obsessed. Built for merchants operating in the most complex and demanding eCommerce sectors, our platform goes far beyond transaction processing. We solve for scale, compliance, and performance with one unshakable focus: delivering outcomes that power merchant growth.

From payments and banking to treasury and settlement, we engineer the financial infrastructure that gives our partners a competitive edge. The result? Faster onboarding, smarter operations, and resilient, real-time performance.

At OKTO, we enable merchants to Play Differently, transforming payments from routine transactions into true differentiators that deliver personalized, frictionless experiences.

Our AI-native innovation harnesses data and insight to power every decision, while our proprietary in-house engineering ensures precision and control. Combined with deep, trust-based relationships worldwide, we’re redefining what it means to build, scale, and win in complex digital commerce.

Your responsibilities will include but will not be limited to:

• Ability to develop new product functionality based on business and technical requirements
• Produce performance optimized code that is properly unit tested
• Support SIT, UAT and production environments
• Apply modern Agile methodologies

Requirements

• Excellent academic background. Bachelor or Master’s degree in a Computer Engineering field or related area
• Proven experience 5+ years in middleware application development using Java programming language (at least 1 year using Java 11).
• Java 11+ Functional Programming as well as Object-Oriented design (OOD)
• Some familiarity with Event-Driven software design patterns
• Strong written and verbal communication in English and Greek
• Good technical writing for product requirements, design documents and product specifications
• Working with versioning and source control systems (e.g. Git)
• Analytical and practical thinking
• Team player

Specific experience:

• Java 11+ microservices with Spring Boot and Spring Cloud (Netflix OSS)
• Spring 5 Framework, OAuth2 Security, JPA persistence and ORM modelling, Restful API design
• Proficient understanding of Git code versioning tool

Benefits

💰 Competitive Compensation

💻 Modern Equipment

📈 Career Growth

🎓 Continuous Learning

🌱 Inclusive Environment

🏠 Work-from-home