Prompt Engineer

Mad Devs LLC; United Kingdom; Remote; GBP 80,000 - 100,000; Full time

Job summary

A leading tech firm in the United Kingdom is seeking a Prompt Engineer to join its remote-first team. This role involves designing complex system prompts, optimizing performance, and ensuring high-quality output using LLM expertise. Candidates should have strong command over JSON and Markdown, deep analytical skills, and be fluent in Russian and English. Join us to tackle innovative projects with considerable global impact, enhancing your skills in a flexible work environment.

Benefits

Remote-first culture

Long-term projects

Professional communities

Paid conferences

Qualifications

• Expertise in LLMs, understanding token limits and context windows.
• Comfortable with JSON and Markdown; able to write Jinja2 templates.
• Ability to analyze conversation logs to find errors.

Responsibilities

• Design complex system prompts using advanced techniques.
• Engineer reliable prompts for JSON outputs.
• Control the tone and pacing of the agent's responses.
• Embed dynamic data into prompts effectively.
• Continuously A/B test prompts for optimization.

Skills

Deep LLM Expertise

Technical Proficiency

Analytical Mindset

Linguistic Precision

Fluent in Russian and English (B2+)

Tools

JSON

Markdown

Jinja2

Job description

We're seeking Prompt Engineer to join our team. This is your chance to apply your skills to a project with real-world impact.

About Us

Mad Devs is a full-stack team specializing in developing and administering large-scale IT products across diverse industries. Many of our products operate in Europe, the USA, and countries across Southeast Asia. We are passionate about tackling complex challenges and delivering innovative solutions that make a meaningful impact globally.
#LINKD

Responsibilities:

• System Prompt Architecture: Design complex, structured system prompts. Use Chain-of-Thought and Few-Shot techniques to solve complex logic tasks (e.g., "Diagnose this car issue based on the user's description")
• Structured Generation (JSON): Engineer prompts that reliably output valid JSON for API integrations. You must ensure the model follows schema constraints 100% of the time
• Voice Persona Design: Control the agent's tone and pacing. Use instructions to influence output, making the agent sound empathetic, professional, or urgent as needed
• Jinja2 Integration: Embed dynamic data into prompts. You must write prompts that are robust enough to handle empty variables or unexpected data formats ({{ user_history }})
• Optimization: Continuously A/B test prompts to reduce hallucinations and improve conversion rates (e.g., "Did the agent successfully book the meeting?")

Requirements:

• Deep LLM Expertise: You know the difference between GPT-4 and Claude 3 Opus. You understand token limits, temperature, and context windows
• Technical Proficiency: You are comfortable working with JSON and Markdown. You can write basic Jinja2 templates
• Analytical Mindset: You don't just "guess" improvements; you analyze conversation logs to find the root cause of errors
• Linguistic Precision: Excellent command of English to catch subtle nuances in interaction
• Language: Russian (Native/Fluent) and English (B2+)

At Mad Devs, you'll join a passionate team dedicated to solving complex challenges and delivering innovative solutions. Our projects span Europe, the USA and South East Asia, giving you the opportunity to make a global impact. We value flexibility, remote working and professional development, ensuring you thrive in an inspiring environment. Join us in revolutionizing the legal industry with AI!

Remote-first culture

Long-term projects

Salary in dollars

Professional communities

Onsite business trips

Paid conferences

Hi, I'm Ekaterina.

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