Senior Java/Kotlin Engineer

Ciklum is looking for a Senior Java/Kotlin 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/Kotlin Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. On behalf of Ciklum Digital Engineering Team, we are looking for a Senior Java Developer to join team on a full-time basis. You will join a highly motivated team and will be working on a modern solution for our existing client. We are looking for technology experts who want to make an impact on new business by applying best practices and taking ownership. Responsibilities: Back-end development to meet customer’s business needs and implement components according to modern software development environment (cloud-based platforms, microservice architecture, etc.) Taking part in the decision-making process in design application architecture, solution development, architecture and code review Develop and review feature design documents and provide inputs/update to specifications for the solution Design and implement a set of various types of tests (unit, integration, functional, etc) Proactive position in solution development, processes improvements Working in an international distributed team in an Agile environment Communicate with PMs, engineers, Architects, QA and other colleagues and stakeholders Delivering the product roadmap and plannings To use high coding standards, software best practices and write highly testable, automatable and performant code over the whole SDLC Requirements: Experience in software development for more than 5 years Excellent knowledge in Computer Science, Computing Theory: Paradigm & Principles (OOP, SOLID, DDD, TDD, BDD) Database theory (RDBMS, NoSQL) Code testing practices Algorithms Data structures Architectural, Enterprise and Design Patterns Security patterns, Reverse engineering resistance, Common attacks types (OWASP) Understanding of network interactions: protocols conventions (e.g. REST, RPC) authentication and authorization flows standards and practices (e.g. oAuth, JWT) Excellent knowledge and experience in Java (more than 3 years) Experience with high-performance and high-load systems Good knowledge of Kotlin / Reactive programming experience (Spring Boot Reactor) Good knowledge of Domain Driven Design expertise Big Plus: Ops insights, confortable with Linux, command lines, Kubernetes Practical commercial experience with: REST API development Web application frameworks (e.g. Spring Boot Framework) (more than 2 years) Testing frameworks (e.g.e.g. JUnit, PowerMock, WiresMock) (more than 2 years) ORM (e.g. Hibernate) (more than 2 years) RDBMS (e.g MySQL/MariaDB, PostgreSQL, Oracle) (more than 2 years) Key-value storages (e.g. Redis, Memcached) Messaging systems (e.g. RabbitMQ, Apache Kafka, Active MQ, AWS SQS, Azure Service Bus, Google Pub/Sub) Web Servers Version control systems (GIT) Node.js / Typescript experience (for AWS lambda's) AWS experience (Aurora, Lambda's, Step Functions, etc.) Docker Continuous Integration tools (e.g. Gitlab Pipeline, Jenkins, TeamCity, Bamboo) Builders Experience with: Troubleshooting, profiling and debugging applications Creation software architecture and design of complex applications, platforms, microservices solutions Agile software processes and technologies Code Review process Refactoring process Fluent or Upper-Intermediate English Desirable: Certifications on: Java Spring Frameworks Cloud computing platforms (AWS, GCP, Microsoft Azure) Understanding of orchestration and containerisation (e.g. Kubernetes, Swarm) Knowledge in Deployment patterns Practical commercial experience with: Serverless architecture Integration with 3rd party solutions NoSQL (e.g. MongoDB, ElasticSearch, CouchDB) Experience with Search Engines (e.g. ElasticSearch, Azure Search, Apache Solr) Provisioning tools (e.g. Terraform, Ansible) Quality tools (e.g. SonarQube) 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. 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. #LI-AD1