Senior Prompt Engineer

About the Position

We are seeking an expert Senior Prompt Engineer 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.

Responsibilities

• 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.

Requirements

• 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.
• Fluent English (C1): Strong written and verbal communication skills are a must, as you will work in a global environment.
• Collaborating with global teams, requiring periodic availability in the 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: LangChain, LlamaIndex, LangSmith, PromptLayer, or equivalents.
• Contributions to open-source prompt design projects or published writing on the topic.

We Offer

Health Benefits

• 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)

Learning Opportunities

• Udemy Business access

Additional Benefits

• 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

Salary & Eligibility

Pay Range

16 000 - 18 000 PLN gross, Employment Agreement (Umowa o Pracę)

Location

This position is 100% remote, work from home. You must live in Poland or be willing to relocate to Poland to be considered for this role.

Language

CVs must be submitted in English. We cannot consider applications submitted in any other language.

About the Company

We Transform Work Lives

As an established global organization, BOLD helps people find jobs. Our story is one of growth, success, and professional fulfillment. We create digital products that have empowered millions of people in 180 countries to build stronger resumes, cover letters, and CVs. The result of our work helps people interview confidently, finding the right job in less time. Our employees are experts, learners, contributors, and creatives.

We Celebrate and Promote Diversity and Inclusion

We value our position as an Equal Opportunity Employer. We hire based on qualifications, merit, and our business needs. We don't discriminate regarding race, color, religion, gender, pregnancy, national origin or citizenship, ancestry, age, physical or mental disability, veteran status, sexual orientation, gender identity or expression, marital status, genetic information, or any other applicable characteristic protected by law.