Senior Full Stack Engineer
Ciklum is looking for a Senior Full Stack 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 Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. The engineer will work closely with product, architecture, AI engineering, and platform teams to build usable, secure, and scalable agent interfaces that connect into enterprise systems, data sources, LLM services, and internal client platform capabilities. Responsibilities: Build full stack features for AI agent use cases, including chat interfaces, task review screens, approval flows, exception queues and operational dashboards Develop React/TypeScript frontend components for agent interaction, configuration, monitoring and human-in-the-loop review Design and implement backend APIs and services that support agent execution, data retrieval, workflow actions, audit trails and enterprise integrations Connect agents with enterprise systems, databases, document stores, APIs and event-based workflows used within client environment Integrate with LLM gateways, model platforms, vector stores, prompt/configuration services and AI observability tooling Implement secure, production-ready patterns for authentication, RBAC, tenant-aware data access, logging, testing, CI/CD and deployment support Requirements: Strong hands-on experience with React, TypeScript, modern frontend patterns and business application UI development Backend engineering experience with Python/FastAPI, Java/Spring Boot or Node.js Experience building REST APIs, integration services and data access layers for enterprise applications Working knowledge of PostgreSQL or similar relational databases; exposure to vector databases is beneficial Understanding of AI agent patterns such as tool/function calling, RAG, prompt configuration, workflow orchestration and human-in-the-loop design Experience with OAuth 2.0, SSO, RBAC, secure API design and multi-tenant application patterns Familiarity with Git, CI/CD, Docker, Kubernetes, logging and production troubleshooting Desirable: Experience with LangChain, LangGraph, Semantic Kernel, CrewAI, or similar agent frameworks Exposure to Langfuse, LangSmith, OpenTelemetry, or similar observability tools Experience with Temporal or workflow orchestration platforms for long-running business processes Experience building review queues, approval workflows, case management screens, or operational dashboards Familiarity with AWS services, especially AWS Bedrock, API Gateway, Lambda, S3, and related cloud-native services Experience working from Figma designs and building reusable UI component libraries 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-OD4