"We engaged Bill to help us create strategic marketing and sales assets targeted at senior technical and business leaders. Over the course of the project, he delivered exceptional content and insightful competitive analysis that directly influenced how we position Zuplo on our website and in the field. I look forward to working with him again and would recommend him without hesitation."

"I'm pleased to recommend Bill Doerrfeld for his exceptional technical writing and thought leadership in the API and developer portal space. Bill collaborated with us on several articles for our organizations that demonstrated deep expertise in API strategy, developer experience, and emerging technologies.

His work consistently showcased a rare combination of technical depth and accessibility. Bill has a keen ability to distill complex topics—from API developer portal best practices to AI-first company transformations and multicloud enterprise strategies—into clear, actionable insights that resonate with both technical and business audiences.

What impressed me most was Bill's understanding of the broader ecosystem. He doesn't just write about APIs in isolation; he connects them to real business challenges like digital transformation, AI agent integration, and enterprise architecture decisions. His articles provided genuine value to our readers and helped position our brand as a thought leader in the space.

Bill is reliable, professional, and delivers high-quality content that requires minimal editing. I would highly recommend him to any organization looking for a writer who truly understands developer tools, API ecosystems, and the intersection of technology and business strategy."

"Bill wrote a strategic piece for us targeted at senior IT decision makers. Without a lot of coaching, he was able to dive into very technical topics and surface insights that speak to the right audience. Bill is the person to call when you want a piece with vision and the data to back it up."

"I engaged Bill Doerrfeld to perform a technology sprint in the area of emotion recognition. Bill was very thorough in his approach, asking the right kinds of questions to fully understand my needs and expectations. I was very impressed with how Bill was able to gain access and speak to many different leaders in the industry, translate his findings for easy explanations and offer unique perspectives tailored to my wants. He kept me updated on his progress in a timely manner and his output was well written and organized. On top of his work, he was very personable, friendly and a pleasure to work with. I enjoyed working with Bill and learned a lot from him. I hope to have the fortune of working together in the future.!"

"I engaged Bill to develop content for one of my largest and most challenging projects in the IoT (Internet of Things) space. He was never daunted by the challenge, working with little direction, and always willing to edit until the content was perfect. I thought his writing was fresh, engaging, and audience specific. One of his outlines for an eBook was so impressive our company now uses it as the “gold standard” for future outlines. I would highly recommend Bill as a tech writer and journalist."

"My crowing achievement is you and the team. You're all amazing and I stand in admiration of what you've done!"

"I worked as a writer for Nordic APIs where Bill is the editor in chief. It was a real pleasure working with him. He is an experienced writer and editor with deep knowledge of the API space and a knack for helping authors deliver great content on a regular basis. I can only hope to work with him again in the future!"