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The Prompt Engineering Role

At Nabla, we think about AI systems as products — and prompts as first-class infrastructure.

Modern LLM-powered systems don’t fail because of missing models, but because of vague instructions, leaky evaluation, and poorly specified success criteria. Prompt engineering is the discipline that makes these systems reliable, debuggable, and safe — especially in clinical contexts.

We are looking for our first Prompt Engineer to own the quality layer of our LLM systems. You will work closely with Product, ML, and Clinical teams to design, iterate, and rigorously evaluate prompts that power our clinical note generation and our internal “judge AI” used to assess output quality (hallucinations, recall, style, clinical correctness).

This role is ideal for someone who genuinely enjoys the craft of prompt design, evaluation, and iteration — and who brings rigor, patience, and taste to work that others often find tedious but mission-critical.

This role will likely start as freelance , with the possibility to expand over time.

Product at Nabla

The product team is a tight-knit group of builders, designers, and strategists. Together with engineering, we define and deliver high-impact tools that delight clinicians and solve their most pressing problems.

Our AI systems are at the core of the product experience. Ensuring they are accurate, reliable, and clinically safe is not optional — it is foundational to trust and adoption.

Responsibilities Prompt design & iteration

• Design, write, and maintain high-quality prompts for:

• Clinical note generation

• Evaluation / “judge” models assessing hallucinations, recall, structure, tone, and adherence to clinical standards

• Systematically iterate on prompts based on failure modes, edge cases, and real-world usage.

LLM evaluation & quality

• Define clear, measurable quality criteria for each type of output, including accuracy, completeness, style, and clinical relevance.
• Build and maintain prompt-based evaluation frameworks to consistently score and compare outputs across models and prompt versions.
• Identify blind spots, regressions, and trade-offs in model behavior.

Reliability & rigor

• Treat prompts as production artifacts:

• Versioned

• Documented

• Tested against known failure cases

• Create reusable prompt patterns and guidelines to ensure consistency and maintainability.

Cross-functional collaboration

• Work closely with ML engineers to surface model limitations and propose prompt-level mitigations.
• Partner with Product and Clinical teams to translate qualitative expectations into explicit, testable instructions.
• Act as a bridge between “what clinicians expect” and “what LLMs actually do.”

Your DNA

• Prior hands-on experience with prompt engineering for production LLM systems (not just experimentation or demos).

• Strong written communication skills and an exceptional attention to detail.

• A rigorous mindset: you enjoy defining criteria, edge cases, and evaluation frameworks.

• Comfort working with:

• LLM APIs (OpenAI, Anthropic, Gemini, etc.)

• Structured prompt formats (system / developer / user messages)

• Basic scripting or tooling to run prompt tests (Python, notebooks, or similar)

• High tolerance — and even enjoyment — for iterative, detail-oriented work that requires patience and taste.

• Ability to reason about hallucinations, recall failures, ambiguity, and instruction-following limitations.

• Interest in healthcare, clinical workflows, or safety-critical AI systems is a strong plus.

• Autonomous and self-directed; comfortable operating with minimal process in a fast-moving startup environment.

Where We are based Our offices are based in Paris 3e (Arts & Métiers).

Remote policy: 1 day a week (with some flexibility). Possibility of working remotely 1-2 weeks once a year.

Benefits Just like we’re dedicated to supporting doctors’ well-being, ensuring yours is a top priority. We firmly believe that by prioritizing your well-being, we support you to excel in your work.

• Public transportation costs covered at 50%
• Exercise class during the workday: Yoga, running, pilates, HIIT
• Culture of trust & accountability — your output matters more than your clock-in time

Life at Nabla When you become a part of our company, you join a team of excellence-driven, curious, and genuinely kind individuals. Together, we're committed to making clinicians' lives easier and improving healthcare experiences for everyone. We believe in a world where clinicians can focus on what they were trained to do - caring for their patients, and where no patient feels their visit was rushed.

We come to work excited to leverage AI to do more for clinicians. We’re obsessed with our users’ satisfaction and we actively seek out opportunities to engage one-on-one with clinicians to understand how Nabla can better help. We consistently look for ways to improve and do not shy away from doing the work to excel. Whether it’s a feature our users asked for, or a new article for our blog, we prioritize collaboration to deliver exceptional outcomes.

We love having fun as much as we love work. Our #nablabla channel is as active as our #feature-show-off channel, we exercise during the work day at least 3 times a week (yoga, running, pilates, or HIIT, your choice!), enjoy regular off-sites to gather the team, and travel to see each other in places like NY, Paris, San Francisco, and many other vibrant cities. Oh, and we’re constantly snacking on chocolate or nuts!

If this sounds like an environment you’ll thrive in, we look forward to reading your application!

Our Values at Nabla Joining Nabla means being part of a team that shares a commitment to excellence, humility, growth, and inclusion.

Every day is a new chance to excel We aim for nothing less than the best and are willing to put in the effort and dedication required to exceed standards. We learn from yesterday’s failures and do better every day.

Stay humble There’s no place for ego in our team. Our collective success is more important than individual achievements. We see humility as wisdom — keeping focus on the bigger picture.

Feedback is a gift We embrace feedback and foster a culture of trust and respect that helps everyone grow. We communicate openly about both achievements and challenges, and we actively involve each other in finding solutions.

Committed to diversity We recognize the ongoing challenge of diversity in tech. Our responsibility starts with fostering an inclusive environment where everyone feels empowered to be their authentic selves and do their best work.

Diversity & Inclusion Diversity and inclusivity are fundamental values at Nabla. We embrace individuals from various backgrounds, including race, gender, educational history, sexual orientation, and beyond.

As an equal opportunity employer, we actively seek out and welcome applicants from diverse backgrounds, believing that a wide range of perspectives enriches our team and enhances our ability to innovate and thrive.

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