Duanex

Since 2013, Duanex has been building bespoke software for international companies and startups — from mobile apps to complex cloud solutions. Our clients span health & fintech, digital banking, and large insurance organizations. We follow Agile best practices, and automated testing is a core part of our delivery.

We are looking for a Senior Java Developer to become a part of our team. Big landscape with different projects, an international team.

What you’ll do:

• Build new services and extend existing enterprise solutions
• Modernize legacy codebases, including JavaEE → Spring migrations
• Design and implement REST APIs and integrations with internal/external systems
• Keep quality high: tests, code reviews, clean architecture, SOLID
• Collaborate closely with developers, analysts, and DevOps; be proactive in proposing solutions

Technical skills:

• Problem Analysis, Problem-Solving and Reasoning
• 4+ years of experience in Java
• Strong Java core knowledge
• Spring / JavaEE
• JPA
• DevOps and CI/CD Pipelines (understanding, not implementation)
• Strong knowledge of SOLID, design patterns and algorithms
• Good English skills

Would be a plus:

• Software design and architecture experience
• SQL
• Spring Data, Boot
• React / Angular
• Docker
• Jenkins
• RabbitMQ or other message brokers
• Apache Camel

Work format & perks:

• Remote-friendly; optional office in Kyiv
• Flexible schedule
• 20 paid vacation days + 10 paid sick days
• Accounting support 

Hiring process: Recruiter interview → Technical interview → Client interview

Since 2013, Duanex has been building bespoke software for international companies and startups — from mobile apps to complex cloud solutions. Our clients span health & fintech, digital banking, and large insurance organizations. We follow Agile best practices, and automated testing is a core part of our delivery.
 

We are looking for a Junior Developer to join us and grow in the world of AI agents, automation, and voice technologies.

What you’ll do:

• Build and configure Voice Bots using VAPI and Retell
• Integrate bots with systems like CRM and other APIs
• Create and fine-tune AI agents for internal tools and automation use cases
• Participate in data scraping, prompt design, and model training (RAG setups, Llama3)
• Work directly with the architect and take ownership of your solutions

Skills:

• 6+ months of experience
• Solid knowledge of Python
• Familiarity with OpenAI API and prompt engineering
• Understanding of Git, Docker, Jenkins
• English lever B1 or higher
• Self-driven, proactive, and comfortable working independently
• Not afraid of hands-on tasks beyond coding (e.g. basic server setup)

Would be a plus:

• Frontend (JS)
• Machine learning

Work format & perks:

• Remote-friendly; optional office in Kyiv
• 20 paid vacation days + 10 paid sick days
• Flexible schedule
• Accounting support

Hiring process: Recruiter interview →  Technical task → Final interview