Full-stack build, front to back. Interface, API, database, authentication, and deployment. I run multi-tenant SaaS in production, so I build the parts that break at 2am: authentication, tenant isolation, subscription webhooks, and the database rules that stop one client from reading another client's data. Authorization is enforced in the database, not just the interface, which means a user cannot reach data that is not theirs by editing a request. Stack: TypeScript, React, Node, Python, PostgreSQL, Supabase, Stripe, Netlify. For this service I will build one working feature end to end: the interface, the API behind it, and the database schema and access rules underneath it. You own the code and it is hosted on your infrastructure. Portfolio and public source at xkaii.studio. Tell me what you are building and I will map the schema before you order.

Hand-written WebGL and GLSL. No page builder, no template, no bought Three.js scene that a hundred other sites are also running. For this service I will build one custom 3D section for your site: an animated hero, a product showcase, or an interactive background. It can move on its own, react to the cursor, or be driven by scroll position. Mobile-first and performance-tested on real devices, because a 3D site that tanks on a phone is a liability, not a differentiator. Fallbacks included for hardware that cannot run the effect. You get the source, integrated into your existing site or delivered as a standalone component. My portfolio site is itself the demo. Every effect on it is hand-written shader work: xkaii.studio Send me a reference and I will tell you what is achievable in the browser before you order.

You have an app that works but you are not sure what is fragile, what is insecure, or what will break when you grow. I will review your codebase, database and deployment, then give you a written priority list: what is actually dangerous, what is merely untidy, and what to fix in what order. What I look at: authentication and access control, database schema and row level security, error handling, deployment configuration, dependency risk, and the places where a user can reach data that is not theirs. I am a backend engineer specializing in multi-tenant SaaS. I have found and reported two real SSRF vulnerabilities in production software, both confirmed fixed. My tenant isolation work is public and runnable on GitHub. You get a written report, not a scanner dump. Every finding includes the specific reason it matters for your app. Send me your stack and I will tell you what I would look at first.

Most AI automation dies because it was built as a demo, not as something that runs unattended on a Tuesday when an API times out. I build agents and workflows that handle the boring parts: reading and routing data, calling your tools, writing to your systems, and failing safely when something upstream breaks. For this service I will build one working automation connected to one of your tools, with error handling and retries, plus plain documentation so you are not dependent on me to change it later. Common builds: lead intake and routing, document processing, data enrichment, customer support triage, internal reporting. I am a full-stack engineer running multi-tenant SaaS in production. Portfolio and source code at xkaii.studio. Message me with the process you want automated and I will tell you if it is worth automating before you order.