Senior Python Engineer

We are seeking an experienced and talented Senior Software Engineer with expertise in Python to support the AI platform team.

Our team is composed of data scientists, software engineers, and business analysts. We handle large-scale data for diverse use cases, utilizing both classical machine learning models and modern generative AI. We are expanding rapidly in areas like chatbots and agents, leveraging advanced technology in a cloud-native environment.

This position operates in a hybrid mode, requiring three days per week at our Krakow office.

Responsibilities

• Design advanced prompts tailored for document understanding and data extraction use cases

• Collaborate with business stakeholders to interpret document structures, semantics, and key-value relationships

• Conduct PoCs (Proofs of Concept) using Python to test prompt effectiveness and adapt as needed

• Build and maintain a prompt library with a focus on quality, reusability, and adherence to security and privacy guidelines

• Validate prompts, stress test scenarios, and model failover strategies for different LLMs

• Evaluate LLM output quality, refine prompts, and develop model-specific strategies

• Coordinate with ML engineers on fine-tuning initiatives for improved accuracy in specific document domains

• Document best practices, strategies, and experimental outcomes in a clear and organized format

• Address risks related to prompt injection, hallucination, or other LLM vulnerabilities

Requirements

• Proven experience (2+ LLM production projects) designing and deploying prompts in practical applications

• Excellent understanding of prompt structures and contexts

• Proficiency in Python, including work with LLM APIs, prompt engineering frameworks, and data manipulation tools like Pandas

• Experience with at least one fine-tuning or RAG pipeline implementation

• Familiarity with prompt evaluation tools, metrics like BLEU, ROUGE, semantic similarity, and human-in-the-loop validation

• Understanding of LLM-related security issues such as prompt injection, output filtering, and API constraints

• Strong communication skills and ability to convert complex document requirements into actionable prompt logic

• Analytical mindset with attention to both high-level design and output precision

Nice to have

• Understanding of vector databases and retrieval-augmented generation

• Familiarity with tools like LangChain, LlamaIndex, or comparable platforms

• Background in OCR, NLP, or intelligent document processing pipelines

We offer

• We gather like-minded people:

  • Engineering community of industry professionals

  • Friendly team and enjoyable working environment

  • Flexible schedule and opportunity to work remotely within Poland

  • Chance to work abroad for up to 60 days annually

  • Business-driven relocation opportunities

• We provide growth opportunities:

  • Outstanding career roadmap

  • Leadership development, career advising, soft skills, and well-being programs

  • Certification (GCP, Azure, AWS)

  • Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru

  • English classes

• We cover it all:

  • Stable income (Employment Contract or B2B)

  • Participation in the Employee Stock Purchase Plan

  • Benefits package (health insurance, multisport, shopping vouchers)

  • Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more

  • Referral bonuses

  • Corporate, social and well-being events

• Please, note:

  • The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview

  • We will reach out to selected candidates exclusively

EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.