United States
Cassidy Williams, known online as Cassidoo, is a US-based software engineer and developer advocate whose online presence sits at the crossroads of technical education and self-aware tech humor.
Total Followers +0.0%
21K
Across TikTok
Primary Platform
YouTube
21K followers · 100% of audience
Engagement
6.9%
vs. 1.5% category median
Sponsorship Tier
Micro
As an ongoing GitHub Blog contributor, she published a breakdown of emerging AI terminology for developers — one of several bylined pieces she wrote for GitHub in 2026.
She appeared as a speaker at RenderATL, a prominent tech conference focused on diversity in engineering.
She recapped the experience on her blog, noting she spoke "a lot" at one of the year's biggest developer conferences.
After a gap in video publishing, she publicly announced resuming video creation across both platforms.
PocketCal lets users select dates and share them via a single URL — no sign-up required. She published a full build log detailing how AI coding assistants (GitHub Copilot + Claude) generated roughly 70% of the initial React codebase.
| Platform | Followers | 30d Growth | Engagement | Posts / wk | Last upload |
|---|---|---|---|---|---|
| TikTok | 21,000 | +0 | 6.9% | — | 2 months ago |
| Window | TikTok | Combined | ||
|---|---|---|---|---|
| Last 7 days | +0 +0.0% | +0 +0.0% | +0 +0.0% | +0 |
| Last 30 days | +0 +0.0% | +0 +0.0% | +0 +0.0% | +0 |
| Last 90 days | +0 +0.0% | +0 +0.0% | +0 +0.0% | +0 |
| Last 365 days | +0 +0.0% | +0 +0.0% | +0 +0.0% | +0 |
Daily follower snapshots from CreatorDB's longitudinal index.
Cassidy Williams, known online as Cassidoo, is a US-based software engineer and developer advocate whose online presence sits at the crossroads of technical education and self-aware tech humor. She has cultivated a reputation in developer communities through a long-running newsletter and a personality-driven approach to software that treats coding as something playful rather than intimidating. Her self-authored description — "engineer making memes and dreams... and software" — accurately telegraphs the tone: technically grounded but never dry. Her involvement in events like GitHub Universe and integrations with tools such as the GitHub Copilot CLI signal genuine standing within professional developer circles, not just peripheral tech-lifestyle content.
On TikTok, her micro-tier following delivers engagement well above the category median, reflecting a compact but attentive audience of developers and tech-adjacent early-career professionals. Her content mix leans into indie software she has built herself — including the word game app Jumblie and the productivity tool PocketCal — blending founder storytelling with developer tutorials. Her audience skews notably female and concentrates heavily in the 18–34 range, a demographic underrepresented in mainstream developer content. That combination positions her as a distinctive fit for developer tools, productivity software, and tech brands specifically trying to reach women in engineering pipelines.
Cassidoo reaches an audience concentrated in United States primarily through YouTube, and is best activated via TikTok branded content. As a tech creator they map naturally to brands targeting that space. With no brand deals logged yet, they read as an available, category-aligned partner for advertisers building early presence in the space. Engagement on YouTube runs around 6.9%, which points to an audience better suited to category-relevant, mid-funnel campaigns than to pure-reach buys. Their YouTube-first format lends itself to integrations that sit inside the creator's usual content rather than running as standalone ads. Because the audience follows tech content rather than arriving through untargeted reach, sponsorships that match the channel's subject matter tend to convert more efficiently than broad placements. A consistent, on-topic posting focus gives sponsors a predictable, brand-safe environment, lowering placement risk compared with broad, general-interest channels. Campaigns here are best measured on qualified engagement and consideration within the niche rather than on raw impression volume. For United States-focused brands in tech and related categories, Cassidoo offers a defined, creative-fit audience rather than broad, low-intent impressions.
Benchmark estimates for a creator at Cassidoo's tier (Micro, 21K combined followers, United States). Pulled from CreatorDB's category benchmarks.
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Cassidoo's real name is Cassidy Williams. She built her following under the handle cassidoo across platforms including TikTok and YouTube while maintaining an active career as a software engineer in the tech industry.
Yes, Cassidy Williams created Jumblie, a browser-based word puzzle game that sits alongside daily word games like Wordle. It's one of several apps she has shipped herself, reflecting her habit of building real software products rather than just talking about tech.
PocketCal is a free app Cassidoo built and promotes at PocketCal.com. She markets it with her signature self-deprecating humor, joking that it's so good you'll cry — which fits her "engineer making memes and dreams" content personality perfectly.
Cassidoo built and promoted an app that lets users log and track when they cry, applying software-style data habits to everyday emotional moments. It's a strong example of her content style: real, working software wrapped in absurdist humor that resonates with a developer audience.
Yes, Cassidy Williams writes a long-running weekly developer newsletter called rendezvous with cassidoo, which has become well known in the JavaScript and web development community. It typically features a programming challenge of the week and conversations with people across the tech industry.
Cassidoo has posted content demonstrating how to use the GitHub Copilot CLI to connect hardware like the Logitech MX Creative Console to tools like Elgato, showing practical developer tooling with a hardware twist. This reflects her ongoing content relationship with GitHub and her interest in bridging software workflows with physical setups.
ModRetro is a company that produces retro-style handheld gaming hardware, and it has appeared in Cassidoo's content as part of her broader interest in gaming and developer culture. Her posts about ModRetro fit naturally with her tech-and-humor personality and appeal to an audience that sits at the overlap of software engineering and classic gaming.
Cassidoo is a software engineer first — her own TikTok bio reads "Engineer making memes and dreams... and software." She actively ships her own apps like PocketCal and Jumblie rather than only making content about tech, which gives her unusual credibility in the developer community.
Cassidy Williams has held engineering and developer advocacy roles at several well-known tech companies over her career, including Netlify. More recently she has been operating as an independent contractor and freelancer, a transition she discusses openly in her content.
Cassidoo's TikTok output slowed through 2026, with a gap of a couple of months in her posting as of mid-year. Her most consistent ongoing presence has been through her developer newsletter and on YouTube rather than short-form video.
Stats (followers, engagement, audience demographics, growth) are pulled live from the CreatorDB API covering YouTube, Instagram and TikTok. Bio and FAQ content is AI-assisted; news items are sourced from cited public press at generation time. Read the full methodology →
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@cassidoo · YouTube
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