About the Position

Quantum is expanding the team and has a brilliant opportunity for a Senior Data Science Engineer. The client is a pioneering technological research company that leverages proprietary AI-based analysis and language models to provide comprehensive insights into global stocks in multiple languages. Its mission is to bridge the knowledge gap in the investment world and empower investors to become “super-investors.” Through generative AI technology integrated into brokerage platforms and financial institutions’ infrastructures, the company provides instant fundamental analyses of global stocks and enables informed investment decisions for millions of investors worldwide.

As a Senior Data Science Engineer, you will research, build, and deploy machine learning models and model-driven services powering an AI-driven financial platform. You will take end-to-end ownership of solutions, from problem framing and data exploration through modeling, evaluation, deployment, and monitoring, with a strong focus on LLMs, NLP, and production AI systems.

Responsibilities

End-to-end development of AI and Data Science solutions, from problem framing and data exploration to production deployment
Design and development of LLM-powered conversational features, including multi-turn dialogue, context handling, and answer generation over financial data
Development and optimization of RAG pipelines and LLM-powered workflows
Training, fine-tuning, and maintenance of NLP models for tasks such as classification, entity extraction, intent detection, and embeddings
Evaluation and improvement of LLM and NLP models, including automated evaluation, regression testing, and LLM-as-a-judge approaches
Development and maintenance of Python services within a large system of LLM-powered microservices
Design of reliable production LLM workflows with model routing, fallbacks, retries, caching, and rate-limit handling
Design and development of RESTful APIs consumed by internal services, frontends, and partners
Deployment, monitoring, and operation of AI models and services in production
Working with AWS infrastructure, including EKS, Lambda, S3, SageMaker, and GPU instances
Designing and improving AI/ML pipelines and production systems while optimizing quality, latency, and cost
Collaboration with product managers, backend engineers, DevOps, and financial domain experts
Staying up to date with LLM and NLP research and adapting relevant methods and algorithms to real-world problems

Requirements

5+ years of commercial experience in Data Science, Machine Learning, or AI Engineering
Strong Python skills, OOP, and software engineering fundamentals
3+ years of hands-on experience with LLMs and NLP
Strong proficiency in prompt engineering
Practical experience with LLM evaluation and quality metrics
Good understanding of modern Deep Learning architectures
Hands-on experience with at least one Deep Learning framework (PyTorch, TensorFlow)
Experience working with SQL and NoSQL databases
Practical experience with Docker and containerized applications
Experience deploying and operating services on Kubernetes
Practical experience with AI coding agents and development tools (e.g. Claude Code, Cursor)
At least an Upper-Intermediate level of English (spoken and written)

Nice to Have

Hands-on experience with RAG, vector databases, and semantic search
Experience with fine-tuning or training LLMs
Experience with Cloud Computing Platforms (AWS, GCP, Azure)
Experience with LLM/AI frameworks such as LangChain, LangGraph, LlamaIndex, or similar
Familiarity with observability tooling such as Grafana, Prometheus, and LLM tracing tools (e.g. Langfuse, LangSmith)
Domain knowledge in financial markets, fintech, or trading platforms
Familiarity with mathematical optimization (LP/MILP, constraint programming)
Participation in Kaggle competitions

We Offer

Delivering high-end software projects that address real-world problems
Surrounding experts who are ready to move forward professionally
Professional growth plan and team leader support
Taking ownership of R&D and socially significant projects
Participation in worldwide tech conferences and competitions
Taking part in regular educational activities
Being a part of a multicultural company with a fun and lighthearted atmosphere
Working from anywhere with flexible working hours
Paid vacation and sick leave days

About the Company

Quantum is a global technology partner delivering high-end software products that address real-world problems. We advance emerging technologies for outside-the-box solutions. We focus on Machine Learning, Computer Vision, Deep Learning, GIS, MLOps, Blockchain, and more.

Here at Quantum, we are dedicated to creating state-of-the-art solutions that effectively address the pressing issues faced by businesses and the world. To date, our team of exceptional people has already helped many organizations globally attain technological leadership.

We constantly discover new ways to solve never-ending business challenges by adopting new technologies, even when there isn’t yet a best practice. If you share our passion for problem-solving and making an impact, join us and enjoy getting to know our wealth of experience!

Join Our Team

Take a step towards your data-driven future with Quantum.

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Data Science Engineer

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