Liyona Johny | BlogPractical guides on API design, security, performance, testing, and client work, from a full-stack engineer.https://liyonajohny.comen-usThe PyTest fixtures worth writing on day onehttps://liyonajohny.com/blog/pytest-fixtures-worth-writinghttps://liyonajohny.com/blog/pytest-fixtures-worth-writingFour fixtures that make an API test suite fast, isolated, and pleasant to add to, with the database rollback pattern in full.Mon, 14 Sep 2026 00:00:00 GMTTestingPyTestFastAPIPythonLiyona JohnySingle sign-on between a custom app and a WordPress LMShttps://liyonajohny.com/blog/single-sign-on-into-wordpress-lmshttps://liyonajohny.com/blog/single-sign-on-into-wordpress-lmsHow to let one login carry a user into LearnDash without making WordPress the source of truth, and the mistakes to avoid on the way.Thu, 10 Sep 2026 00:00:00 GMTSingle sign-onWordPressSecurityFastAPILiyona JohnyDesigning a REST API other people can actually usehttps://liyonajohny.com/blog/rest-api-people-can-usehttps://liyonajohny.com/blog/rest-api-people-can-useNaming, status codes, errors, pagination, and versioning decisions that save your consumers from guessing.Wed, 02 Sep 2026 00:00:00 GMTAPI designFastAPIOpenAPILiyona JohnyTurning a vague client conversation into a data modelhttps://liyonajohny.com/blog/vague-conversation-to-data-modelhttps://liyonajohny.com/blog/vague-conversation-to-data-modelThe questions I ask before writing any code, and why the schema is the decision that costs the most to get wrong.Sat, 22 Aug 2026 00:00:00 GMTPracticeData modellingClient workLiyona JohnyHow to speed up a slow SQL query, in orderhttps://liyonajohny.com/blog/speeding-up-a-slow-sql-queryhttps://liyonajohny.com/blog/speeding-up-a-slow-sql-queryA repeatable checklist for query tuning that starts with measurement and ends with the changes most people try first.Tue, 04 Aug 2026 00:00:00 GMTSQLPostgreSQLPerformanceDatabasesLiyona JohnyHow I review AI-written code before it goes near mainhttps://liyonajohny.com/blog/reviewing-ai-written-codehttps://liyonajohny.com/blog/reviewing-ai-written-codeA working checklist for using AI coding tools without lowering your standards, from someone who uses them every day.Wed, 15 Jul 2026 00:00:00 GMTAI toolingCode reviewPracticeLiyona JohnyA Core Web Vitals checklist that actually moves the numbershttps://liyonajohny.com/blog/core-web-vitals-checklisthttps://liyonajohny.com/blog/core-web-vitals-checklistThe handful of changes that produce most of the improvement on a content site, in the order worth doing them.Wed, 03 Jun 2026 00:00:00 GMTPerformanceCore Web VitalsSEOAstroLiyona JohnyJWT and role-based access in FastAPI and Reacthttps://liyonajohny.com/blog/jwt-and-rbac-across-api-and-uihttps://liyonajohny.com/blog/jwt-and-rbac-across-api-and-uiWhere to enforce permissions, what the UI is actually for, and the token-handling decisions that are easy to get wrong.Fri, 08 May 2026 00:00:00 GMTSecurityFastAPIReact.jsJWTLiyona JohnyValidate API input before it reaches your databasehttps://liyonajohny.com/blog/validate-api-input-with-pydantichttps://liyonajohny.com/blog/validate-api-input-with-pydanticA practical pattern for Pydantic models at the API boundary, and why coercing bad data is worse than rejecting it.Sun, 12 Apr 2026 00:00:00 GMTFastAPIPythonPydanticAPI designLiyona Johny