Senior Software Engineer

Senior Software Engineer apply now We usually respond within three days 🔹Who we are! At Levi9, we are passionate about what we do. We love our work and together in a team, we are smarter and stronger. We are looking for skilled team players who make change happen. Are you one of these players? 🔹About the project You will become part of a dynamic, cross-functional AI team working on AI prototyping, from classic ML to advanced applications of LLMs such as Text-to-SQL and complex RAG systems. Our goal is to engage our customers with advanced AI solutions. 🔹Responsibilities Design and deploy predictive ML models (e.g., decision trees, random forests, gradient boosting) for analytics and feature engineering. Develop recommendation systems using collaborative and content-based filtering techniques. Build and enhance RAG systems, including embedding pipelines, managing vector databases, and integrating LLMs. Implement text-to-SQL capabilities, allowing users to query relational databases naturally using LangChain or similar technologies. Work alongside data engineers to ensure robust data pipelines and high-quality datasets for training and inference. Collaborate with Product Owners and UX Designers to align AI features with user needs and business goals. Continuously research, test, and apply cutting-edge algorithms and technologies to boost model performance and scalability. Monitor and improve production models, ensuring reliability, performance, and compliance with ethical standards. 🔹Requirements Experience: 4+ years in AI/ML, specifically building and deploying production-level ML models. Classic ML: Solid skills with decision trees, random forests, and gradient boosting methods (scikit-learn, XGBoost). Recommender Systems: Proven experience in collaborative and content-based recommendation algorithms. RAG & LLM Development: Hands-on expertise with retrieval-augmented generation systems, vector databases (Pinecone, Weaviate), and frameworks like LangChain or LlamaIndex. Text-to-SQL: Experience developing natural-language-to-SQL solutions using frameworks like LangChain. Programming & Data: Advanced Python proficiency, strong SQL skills, and familiarity with Pandas and NumPy. Cloud & MLOps: Knowledge of deploying models on AWS, Azure, or GCP, and familiarity with CI/CD and MLOps tools (MLflow, Kubeflow). Communication: Comfortable in Agile teams with excellent English communication skills. 🔹Will be a plus Experience with Docker and Kubernetes. Familiarity with advanced embedding techniques and optimizing similarity searches. Background in deep learning frameworks such as TensorFlow or PyTorch. Knowledge of ethical AI practices and data privacy standards. 🔹 Our customer's stack Core — Python 3.13, LangGraph and LangChain for agent orchestration, AWS Bedrock for inference, retrieval, and runtime (AgentCore, Knowledge Bases, Guardrails), Pydantic for schema enforcement, CloudFormation for infrastructure. Quality — pytest across unit, integration, and e2e tiers with a coverage gate, ruff, mypy and pyright, promptfoo for prompt and output evaluation. We hold agent code to the same bar as any other production system. 🔹9 reasons to join us: Today we're working with the technology of tomorrow. We don't wait for a change. We are the change. We're experts in creating experts (Levi9 academy, Lead9 program for leaders). No micromanagement. We are free birds with a clear understanding of what high performance is! Learning in Levi9 never stops (unlimited Udemy for business, meetups, English courses, Professional trainings). Here you can train your body and mind. We've gathered the best locations - comfortable, cozy and pet-friendly offices in Kyiv (5 minutes from Olimpiyska subway station) and Lviv (5 minutes from the Opera Theatre) with regular offline internal events We have master's degree in work-life balance. We are actively supporting Ukraine with constant donations and volunteering 🔹Simple steps to get this job Click the APPLY NOW button and leave your contacts! Department AI/ML Role AI/ML Engineer Locations Kyiv , Lviv Remote status Hybrid Technologies AI/ML Seniority Level Senior Kyiv Lviv About Levi9 Ukraine Levi9 is a nearshore technology service provider with around 1000 employees and 50+ customers. We specialize in custom made business IT – 95% of our work is on the revenue side of our customers. This is where time to market, high productivity, stable team velocity, and great quality through automation, agility, intensive interaction and understanding matter most.