Ciklum is looking for a Senior Java Developer 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: Seeking a Senior Java developer to lead the test-driven migration of a legacy Java EE application to a modern Spring Boot architecture, including transformation from MySQL to NoSQL. Responsibilities: - Analyze existing Java EE components and document business logic - Design clean, testable Spring Boot services and data access interfaces - Plan and execute MySQL to MongoDB data model transformation - Write unit/integration tests prior to implementation - Execute incremental migration with parallel validation - Ensure performance parity with legacy application Requirements: - Java/Spring Boot - Strong experience building enterprise applications, REST APIs, and data access layers with Spring Data - Jakarta EE/Java EE - Ability to analyze and deconstruct legacy Java EE components (EJBs, JPA, CDI) - MySQL - Deep understanding of relational data models and query optimization - MongoDB - Experience with NoSQL patterns, document modeling, and Spring Data MongoDB - TDD/Unit Testing - Proven track record writing comprehensive test suites before implementation (JUnit, Mockito, Testcontainers) Desirable: - Python - For scripting, automation, and migration tooling - LLM/AI Tools - Experience leveraging AI for code analysis, conversion assistance, and documentation generation - Kafka - Understanding of event-driven architectures for data synchronization - Docker/Kubernetes - Familiarity with containerized deployments 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. Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn. 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.

• Independently take on and implement defined work packages • Regularly patch assets to ensure system stability • Coordinate and handle support requests, including troubleshooting and resolving issues in application software • Address technical debt according to the project backlog • Develop mechanisms to automate manual maintenance tasks • Deploy and integrate standardized development and testing tools • Document results and conduct knowledge transfer and onboarding for internal staff • Ensure testability and perform tests for all deliverables • Comply with regulatory requirements, in particular with regard to DORA

• Design and implement end-to-end solutions, from prototype to production deployment; • Collaborate with Data Scientists, Developers, and Analysts across the organization; • Ensure production-grade quality in every deliverable — performance, security, maintainability; • Build and optimize solutions leveraging LLMs, machine learning, and Vector DBs; • Set up and manage infrastructure on Azure and AWS, including private endpoints and VPN integrations; • Contribute to DevOps workflows to streamline CI/CD, monitoring, and deployment.

Role Description A confidential client operating at the intersection of decentralized finance and artificial intelligence is seeking a Senior DevOps / SRE Engineer. This role is critical to the organization’s mission: managing high-stakes environments where infrastructure reliability directly impacts capital protection. The successful candidate will own the architecture that keeps dozens of concurrent AI agents alive, fast, and secure. This is a high-impact position designed for an engineer who thrives on building resilient, zero-downtime systems for autonomous agents managing real-time financial workloads. Key Responsibilities - Agent Infrastructure Management: Build and maintain the infrastructure for concurrent AI trading agents, managing complex cron schedules, state files, and trailing stop processes. - Deployment & Orchestration: Deploy and manage agent environments, including workspace persistence, isolated session management, and Model Context Protocol (MCP) server connectivity. - CI/CD Pipeline Development: Design and operate pipelines for shipping trading skills and plugins to production without interrupting live trading activity. - Zero-Downtime Operations: Execute deployment strategies (blue/green, canary) ensuring active financial positions remain protected during every infrastructure change. - Observability & Monitoring: Build comprehensive alerting across the full stack using metrics, logs, and traces to detect agent failures, state file corruption, or infrastructure regressions before financial loss occurs. - Cloud & Database Scaling: Operate and scale core platform infrastructure, including Kubernetes (EKS) clusters, Redis, Postgres, ClickHouse, and Kafka. - Blockchain Reliability: Maintain blockchain node infrastructure and ensure stable connectivity to exchange APIs and on-chain transaction systems. - Incident Leadership: Lead incident response and on-call practices, including debugging, mitigation, and post-mortems to improve long-term platform reliability. Qualifications - Extensive experience in DevOps, SRE, or Infrastructure Engineering, preferably within a startup environment where systems were built from the ground up. - Proven track record of deploying, scaling, and debugging production workloads, specifically within AWS EKS. - Proficiency with tools such as Terraform, Ansible, or equivalent frameworks. - Hands-on experience with Docker and Helm for packaging production services. - Experience operating production-grade data and messaging systems (Redis, Postgres/RDS, ClickHouse, Kafka). - Strong experience with Prometheus, Grafana, Datadog, Loki, or OpenTelemetry to build proactive operational visibility. - Ability to debug across multiple languages, including Python, Node.js, and Go. Requirements - Understanding of systems where latency and reliability have direct financial consequences. - Familiarity with node infrastructure, exchange APIs, wallet operations, and on-chain monitoring. - Experience managing secrets, access controls, and production hardening for sensitive financial environments. - Experience defining SLOs and building mature on-call practices. Preferred Qualifications (Plus) - Experience with OpenClaw agent deployments and workspace templates. - Familiarity with Model Context Protocol (MCP) server deployment and auth management. - Direct experience with Hyperliquid or other decentralized exchange (DEX) protocols. - Background in fintech, market data infrastructure, or high-frequency trading systems. Benefits - Opportunity to build infrastructure for a new category of software (Autonomous AI Agents). - High-autonomy environment with a focus on engineering excellence and technical ownership. - Competitive compensation package commensurate with senior-level experience. - Remote-first or flexible working arrangements (as specified by the client). Commitment to Equality and Accessibility At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city.