Senior Prompt Designer

We are seeking an expert Senior Prompt Designer I to design, optimize, and operationalize the LLM architectures powering BOLD’s consumer-facing career tools. In this role, you will bridge the gap between advanced natural language processing and exceptional user experiences, ensuring our generative AI outputs are safe, hyper-personalized, contextually accurate, and highly reliable. You are a technical specialist who understands model behavioral nuances, token optimization, latency trade-offs, and system-level prompt chaining. You thrive in an environment balancing rapid prototyping with rigorous, data-driven engineering. ABOUT THIS TEAM As Senior Prompt Designer I, you will sit at the intersection of technical prompt design, rapid prototyping, and rigorous, data-driven evaluation. You will work closely with LLM/Machine Learning Engineers, Product Managers, and UX Designers, acting as the technical specialist who translates 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 evaluation frameworks - automated, heuristic, and human-in-the-loop - 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 leverage AI safely and efficiently. Monitor the evolving GenAI landscape - 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 (eval) 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. 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 (JSON Schema, Pydantic, or equivalent). Familiarity with orchestration tooling: LangChain, LlamaIndex, LangSmith, PromptLayer, or equivalents. Contributions to open-source prompt design projects or published writing on the topic. HERE’S A FEW OF OUR PERKS & BENEFITS Salary range: 16 000 - 18 000 PLN gross (Employment agreement / Umowa o Pracę) Private healthcare (Medicover, medical-only or medical with dental care individual package, 100% paid by BOLD). Mental health support and resources. Multisport Plus card (individual package, 100% paid by BOLD). Udemy Business access. 100% remote work (You must live in Poland or be willing to relocate to Poland to be considered for this role.). Flexible work hours (Each team has their own working habits and obligatory meetings.). Workation (up to 10 working days a year within EEA). Equity in Company . Optional office spaces in Warsaw, Krakow, Wroclaw, Gdansk, or Poznan. Home office reimbursement (one-time equipment purchase, internet reimbursement). Benefits cafeteria platform .