Senior Java Engineer

Ciklum is looking for a Senior Java Engineer to join our team full-time in Ukraine.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:
As a Senior Java Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. Together, we will work on the project for a rapidly growing global food tech platform that serves almost 100 million active users across 25 countries. This team is focused on delivering innovative solutions and value to customers, leveraging backend services, AI/LLM integrations, and modern Kotlin-based architectures.

Responsibilities:

• Write highly testable, automatable, and performant code over the whole SDLC using high coding standards and software best practices

• Develop product, deliver features and updates according to the product roadmap

• Develop and review feature design documents and provide inputs/update to specifications for the solution

• Participate in the team activities according to the methodology – daily meetings, planning, retrospectives, etc

• Coach/supervise middle/junior engineers as required by the project

• Be comfortable conducting research on new experiments and ideas

Requirements:

• Use of best practices and patterns during application design and implementation

• Hands-on experience with monolith, microservice, and serverless architectural styles

• Proficiency in Kotlin / Java, with a strong understanding of the JVM ecosystem and interoperability

• Hands-on experience with Ktor for building and deploying backend APIs and microservices

• Solid knowledge of Koin for dependency injection and application modularity

• Proven experience in backend API integration, including OpenAI and other LLM APIs

• Strong skills in prompt engineering to design, optimize, and manage prompts for effective LLM interaction

• Practical experience in writing and performance tuning of complex SQL

• In-depth proficiency in JUnit and Mockito

• Previous participation in constant quality improvement on the project: conducting code reviews, setting up quality metrics, and monitoring

• Hands-on experience with application deployment patterns and tools

• Practical experience in infrastructure configuration using popular cloud providers

Desirable:

• Experience in configuring application security aspects

• Practical experience in application performance optimization

What's in it for you?

• Strong community: Work alongside top professionals in a friendly, open-door environment

• Growth focus: Take on large-scale projects with a global impact and expand your expertise

• Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications

• Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies

• Flexibility: Enjoy radical flexibility – work remotely or from an office, your choice

• Care: We've got you covered with company-paid medical insurance, mental health support, and financial & legal consultations

About us:
At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you'll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress.
As one of Ukraine's largest IT companies and a top employer recognized by Forbes, we've spent over 20 years delivering meaningful tech solutions. We proudly support diverse talent and military veterans, recognizing their unique skills and perspectives they bring to shaping the future.

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Explore, empower, engineer with Ciklum

Interested already? We would love to get to know you Submit your application. We can't wait to see you at Ciklum.