Applied AI Engineer

Role Summary

At Moss, we give finance professionals the power to automate their day-to-day and make forward-thinking decisions.

Our team and culture make us unique — we’re driven by impact and growth, where every one of us strives to learn and excel. Recognised by Sifted’s Rising 100 and LinkedIn's Top Startups , we’re here to help propel your career and together, make Moss a lasting success.

We are hiring an Applied AI Engineer to design, build, and deploy AI-powered products that transform how finance teams work. You will work with frontier language models to create intelligent services, agents, and workflows that deliver real customer value.

Responsibilities

Build AI-Powered Products

• Design, develop, and deploy AI-enabled applications and services using state-of-the-art language models.
• Build intelligent agents and workflows that automate complex finance processes.
• Experiment with new AI capabilities and rapidly turn prototypes into production-ready features.

Evaluate and Improve AI Systems

• Develop robust evaluation frameworks to measure quality, reliability, and business impact.
• Improve model performance through prompt engineering, retrieval-augmented generation (RAG), and other applied AI techniques.
• Ensure AI systems are accurate, trustworthy, and deliver a high-quality user experience.

Design for Trust and Control

• Build AI systems that are transparent, auditable, and allow users to review and intervene when needed.
• Incorporate customer data into AI workflows while maintaining security and privacy standards.

Collaborate Across Functions

• Partner closely with product managers, designers, engineers, and finance experts to deliver customer-facing AI solutions.
• Help shape Moss's AI product strategy and engineering best practices.

About You

• Degree in Computer Science, Mathematics, Engineering, or a related field.
• Minimum 4 years of professional engineering experience building and shipping production applications.
• Proven experience working with modern LLMs and AI application development.
• Strong programming skills in both Python and Java.
• Experience building backend services and APIs.
• Hands-on experience with AI agents, RAG systems, prompt engineering, or related applied AI techniques.
• Ability to balance rapid experimentation with production-quality engineering.
• Excellent problem-solving and communication skills.

Relevant Technologies

Candidates should have experience with a subset of the following technologies and be eager to learn others.

• AI & Machine Learning
• Frontier LLMs: OpenAI, Anthropic, Gemini, Llama, Mistral, or similar
• Agent and orchestration frameworks: LangChain, LlamaIndex, Haystack, or similar
• Retrieval-Augmented Generation (RAG)
• Prompt engineering and evaluation methodologies
• Fine-tuning and model adaptation techniques
• Software Engineering
• Python and Java
• REST APIs and backend application development
• SQL and modern data storage technologies
• Distributed systems and scalable application design

Requirements

Nice to Have

• Experience building customer-facing AI products
• Experience in fintech, finance, or enterprise software
• Experience with cloud-based AI platforms such as Vertex AI, OpenAI, or Anthropic APIs
• About Moss

Moss is a SaaS scale-up founded in Berlin, with a team of 300+ people from 50+ nationalities in 5 offices across Europe.

Our ambition is bold: to power every SMB’s spend across Europe - fully digital, AI-driven, and seamlessly integrated for complete control. To date, over 5000 businesses in Germany, Netherlands and the UK use Moss’ leading spend management product, with modules such as corporate cards , accounts payables , employee cash reimbursements and procurement .

Moss has raised a total of €180 million in funding and is backed by the most renowned tech investors including Valar Ventures, Tiger Global, Global Founders Capital, Cherry Ventures and A-Star.

Be part of a culture that thrives on impact and speed, where you can take bold moves, learn fast and accomplish more. We’re a place where you can fast track your career - here's what else to expect:

• Top-of-market compensation package, including equity.
• Our vibrant offices are at the heart of our culture, where in-person time fuels collaboration and connection over weekly breakfasts and Friday demos.
• Additional benefits include: 20 days “work from abroad”, 600EUR/GBP Learning & Development Budget, and other local benefits.
• Unless stated otherwise, benefits apply to full-time positions (interns and working students receive a tailored package).
• By applying for the above position, you will confirm that you have reviewed and agreed to our Data Privacy Policy .
• Find more English Speaking Jobs in Germany on Arbeitnow

About the Company

Moss is a national privately held construction firm providing innovative solutions resulting in award-winning projects. With regional offices across the United States, Moss focuses on construction management, solar EPC, and design-build. The company’s diverse portfolio encompasses a wide range of sectors, including luxury high-rise residential, landmark mixed-use developments, hospitality, K-12 and higher education, justice, solar energy and battery storage, and sports. Moss is ranked by Engineering News-Record as the nation’s top solar contractor and one of the top 50 general contractors. Moss prides itself on a strong entrepreneurial culture that honors safety, quality, client engagement, and employee development. Its employees consistently rank Moss as one of the best places to work.