Senior Prompt Engineer

About This Team

As a Senior Prompt Engineer, you will work at the intersection of technical prompt design, rapid prototyping, and rigorous, data-driven evaluation. You will collaborate with LLM/Machine Learning Engineers, Product Managers, and UX Designers to translate product requirements into safe, reliable, production-ready prompt systems.

What You’ll Do

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

What You’ll Need

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

What’s Good 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, including JSON Schema, Pydantic, or equivalent tools.
• Familiarity with orchestration tooling such as LangChain, LlamaIndex, LangSmith, PromptLayer, or equivalents.
• Contributions to open-source prompt design projects or published writing on the topic.

Perks & Benefits

• Salary range: 16,000–18,000 PLN gross under an employment agreement (Umowa o Pracę).
• Private healthcare through Medicover, with medical-only or medical-and-dental individual packages fully covered.
• Mental health support and resources.
• Multisport Plus card, individual package fully covered.
• Udemy Business access.
• 100% remote work. Candidates must live in Poland or be willing to relocate to Poland.
• Flexible work hours, with team-specific working habits and required meetings.
• Workation: up to 10 working days per year within the EEA.
• Equity in the company.
• Optional office spaces in Warsaw, Krakow, Wroclaw, Gdansk, or Poznan.
• Home office reimbursement for a one-time equipment purchase and internet costs.
• Benefits cafeteria platform.