Senior Prompt Engineer

BOLD PL is focused on developing consumer-facing career tools powered by large language models (LLMs) and generative AI in Warsaw. The Senior Prompt Engineer role is part of a team working on AI-driven career products, integrating natural language processing and user experience.

• 5+ years professional experience with language technologies, computational linguistics, or software product development.
• 2+ years of hands-on experience shipping LLM-backed features to production for consumer applications.
• Mastery of advanced prompt engineering techniques including few-shot, chain-of-thought, ReAct, and prompt chaining.
• Deep familiarity with LLM evaluation tools/frameworks such as RAGAS, LangSmith, TruLens, or custom heuristic testing.
• Proven ability to manage complex prompt deployment pipelines in continuous integration environments.
• Fluent English (C1) with strong written and verbal communication skills.
• Availability to collaborate with global teams, including late afternoon (up to 7:00 PM Polish time).

Nice to have:

• Experience with resume builder products, HR tech, or career content platforms.
• Familiarity with fine-tuning, RLHF, or preference data collection workflows.
• Experience with structured output validation (JSON Schema, Pydantic, or equivalent).
• Familiarity with orchestration tooling such as LangChain, LlamaIndex, LangSmith, PromptLayer.
• Contributions to open-source prompt design projects or published writing on prompt engineering.

• Design, prototype, and iterate complex system prompts, few-shot exemplars, and chain-of-thought structures for AI experiences such as Resume Adaptation, Personalization, and Real-time Feedback.
• Collaborate with LLM/Machine Learning Engineers, Product Managers, and UX Designers to translate product requirements into prompt specifications optimizing latency and API costs.
• Architect automated, heuristic, and human-in-the-loop evaluation frameworks to benchmark and guardrail LLM outputs against hallucination, bias, and tone drift.
• Develop standardized prompt frameworks, version-control workflows, and operational playbooks for distributed product teams.
• Monitor generative AI landscape including OSS models and new prompt techniques to improve product performance and model throughput.

By clicking "Apply" the candidate consents to personal data processing by Bold PL sp. z o.o. for recruitment purposes. You must live in Poland or be willing to relocate to Poland to be considered for this role.