Senior Product Engineer (AI Agents) (m/w/d)

Location: Berlin

Department: Tech

Senior Product Engineer (AI Agents)

Permanent employee, Full-time · Berlin (hybrid) 

THE IMPACT YOU WILL MAKE

From socks and pet food to cosmetics, charles is helping countless brands reach their loyal customers every day, one conversation at a time. As a Senior Product Engineer at charles, you'll help drive our product and infrastructure forward, enabling us to revolutionize conversational AI.

You'll work closely with other Engineers, Product, and Design to build scalable, high-performing systems that solve real customer problems. Your contributions will result in reliable, data-driven solutions that support millions of users and push the boundaries of AI-driven messaging commerce.

THIS IS WHAT YOU WILL BE DOING

• Identify and solve high-impact problems using product and business judgment to prioritize what matters most
• Build and iterate on AI-powered conversational features, leveraging LLMs to create meaningful customer experiences
• Extend the Charles API to integrate messaging with CRMs, CDPs, and shop systems
• Write clear, maintainable documentation and ensure reliable, well-tested code
• Monitor systems for performance and implement data-driven improvements
• Review your peers' code and contribute to the company's growth
• Break product initiatives into small technical deliveries and estimate workload

YOU'LL FIT GREAT WITH THESE SKILLS AND VALUES

• 5+ years of experience in software engineering
• Proficiency in Node.js, TypeScript (preferred) or another high-level programming language (Java, Go, Rust, Python)
• Product and business sense: You understand customer needs and focus on solving the right problems, not just building technically interesting solutions
• Experience or strong interest in working with LLMs and AI to build products (prompt engineering, AI APIs, understanding practical limitations)
• Experience deploying and managing applications on cloud platforms, preferably GCP
• A testing-first mindset with strong monitoring skills and the ability to write reliable, scalable code
• Data-driven decision-making and creativity in problem-solving
• Strong communication skills, with the ability to effectively communicate technical concepts to both technical and non-technical stakeholders
• Mentoring skills to help the whole team grow as we scale

Nice to have:

• Familiarity with data protection regulations such as GDPR and designing compliant data architectures
• Previous experience in B2B SaaS startups
• Previous experience in AdTech / MarTech

Meeting all requirements is not necessary to apply. We encourage candidates who meet some but not all of these qualifications to submit their application.

THINGS WE OFFER

• Working on challenging and impactful projects at the forefront of one of the most innovative industries in Europe
• Collaborating with some of the leading experts in Conversational Commerce and disrupting a fast-growing industry
• Joining forces with a unique community of Tech, Product, Sales, Success, and Marketing experts committed to building the best product in Conversational Commerce.
• High autonomy and visibility across the business with the option to own and drive new initiatives
• Celebrating our major and micro-wins as well as getting to know each other better at regular team-building events
• Sharing VSOP (virtual stock options) in the ownership and success of Charles
• Working in a vibrant office in the heart of Berlin overlooking the Wall memorial
• Earning a competitive compensation package

What else we offer?

• Urban Sports Club membership
• Mental Health support through OpenUp
• Free company lunch on Thursdays
• A friendly, open, multicultural work environment
• Dog-friendly office
• Discounts on BVG tickets

About us

It’s better to have a conversation

charles is a conversational AI and CRM that attracts, converts, services, and retains customers via AI agents and marketing automations. charles helps businesses to maximize customer engagement and revenue through conversational channels such as WhatsApp. Brands can reach customers in an interactive way, collect data to expand customer understanding and guide them to targeted offers that convert. charles’ AI Agents deliver hyperpersonalized experiences at scale while ensuring enterprise-grade security and GDPR compliance.

Founded by Kapten & Son co-founder, Artjem Weissbeck, and ex-McKinsey ecommerce lead, Andreas Tussing. charles is backed by Salesforce Ventures, Accel and HV Capital and has raised over EUR 30 million to build the global leader in conversational marketing SaaS for global consumer brands.

Charles and diversity: be yourself and no-one else

Different perspectives bring innovation and richer work environments. We’re committed to building an inclusive company where you always feel like you belong, whatever your age, gender identity, ethnicity, religion, sexual orientation, disability, status or neurodiversity. These values sit at the heart of our hiring process, so we can create a welcoming workplace where everyone feels valued and heard.