Jasper Quill – Author and Python error archeologist

Jasper Quill grew up in a small northern English town where, as a schoolboy, he first became fascinated with computers in an old lab filled with a handful of Pentium III machines. After graduating from the University of Manchester (BSc Computer Science, 2014), he immediately joined a London-based fintech company as a junior Python developer, spending his first two years wrestling with legacy code written in Python 2.5–2.7. That early experience taught him that most bugs are not random — they have history, patterns, and a lineage that can be traced back years.

Over the next 12 years of professional work, Jasper contributed to four different companies: from a payments startup to a large-scale health-tech data platform. He took part in Python 2-to-3 migrations, optimized critical services handling millions of requests daily, and introduced typing and pytest into teams that previously relied on “it just works”. During this time he personally documented and dissected over 800 real production bugs — from classic mutable default arguments to subtle asyncio race conditions. Those notes eventually became his private “bug archive”, which he began using to train colleagues internally.

In 2023 Jasper started a small private channel where, once a week, he would break down one old bug from a real project — no hype, just facts, stack traces, root causes, and how to prevent recurrence. The channel quickly grew to 900 members, most of them mid-level developers facing the same recurring issues. The feedback and stories shared there convinced him to build a full course. In December 2025 the first Pythonicir module was released, focused entirely on “error archaeology” — a systematic exploration of the most common Python pitfalls that have haunted projects for over 15 years.

Jasper does not present himself as a guru or a 20-year veteran trainer. He is simply a developer who still writes code every day and believes the best way to learn is not to be shown how to write correctly from the start, but to understand exactly why and how code breaks — even when it follows “the book”. His approach combines history, technique, and hands-on practice: every bug in the course has a real date, a real (anonymized) project, and a step-by-step dissection.

Achievements & background

• 12 years of commercial Python experience (2014–2026)
• Participated in 4 large-scale Python 2 → 3 migrations (over 1.2 million lines of code combined)
• Optimized critical services, reducing latency by 40–70% in multiple projects
• Introduced typing and static analysis into teams of 8 to 35 developers
• Personally documented and analyzed over 800 production bugs with root-cause breakdowns
• Delivered internal training to more than 120 colleagues across companies (2020–2025)
• Creator of a private bug-dissection channel (900+ members as of 2025)

Jasper has never spoken at major conferences and does not have tens of thousands of followers — he believes real impact is measured not by views, but by how many people start finding and fixing bugs faster in their own code after his materials. That is exactly why Pythonicir was created — as a tool for developers who already write code but want far fewer surprises.

In his free time Jasper lives in Yorkshire, restoring an old 19th-century house together with his wife. He still believes the best way to truly understand Python is to break something, figure out exactly why, and make sure it never happens again.