Hallen Cj.

An inspection and engineering services firm was running an aging WordPress site that was slow to maintain. It was rebuilt from the ground up, migrated off WordPress to a Vue.js front-end, keeping services, project involvements, and global partners easy to update while making the site faster and cleaner to extend.

Hospitals and HMOs coordinate member eligibility, approvals, and claims across disconnected systems and paper trails. eCare pulls enrollment, coverage checks, and claims processing into one web platform, so hospital staff and HMO administrators can verify benefits and settle claims without the phone-and-fax back-and-forth.

During the pandemic, establishments had to log everyone entering for contact tracing, and clipboards and manual sign-in sheets were slow and error-prone. This iOS app lets staff scan each customer’s QR code at the door, capturing entries instantly and syncing them to a central system for health reporting.

A local bakeshop needed an online presence beyond social media, somewhere customers could browse cakes and pastries and place pickup or delivery orders. The site gives the shop a clean storefront with a menu, featured items, and a simple order flow.

Running a live betting platform means staff need to manage players, balances, bonuses, and promotions in real time, without touching production code. This console puts player accounts, transactions, and campaign controls behind a role-gated dashboard that drives the player portal it sits in front of.

A white-label casino has to ship an entire player-facing front-end (lobby, sportsbook, live casino, promotions, and deposits) fast, and reskinned per operator. The portal is built around a CMS so the marketing team can run sign-up bonuses, deposit notices, and event campaigns without waiting on a deploy.

Korean sports fans were stitching predictions together from scattered stat sites and gut feel. Coverspick fronts an ML prediction engine on one live surface across six sports (soccer, basketball, baseball, volleyball, ice hockey, and MMA), pairing AI confidence scores with schedule, home-advantage, and recent-form analysis, plus a community agree/disagree vote on every pick.

Sales and onboarding kept rebuilding the same casino and sportsbook front-ends for every prospect. Winka Templates turns the catalogue into a self-serve gallery: pick a template, open a live demo, and recolor the whole theme to a brand palette on the spot, so a client can see their own skin before a line of bespoke code is written.

Running multiple white-label operators means each client needs its own controlled workspace, while the platform team needs oversight across all of them. Operator’s Playbook splits into an operator portal where clients manage their own books and an admin side that provisions operators, sets limits, and monitors activity across the whole network.

Operators run on numbers like player value, game margins, and campaign ROI, but those usually live scattered across tools. Billion Club gives each operator a client-side intelligence dashboard over their own data, plus an admin side where the platform team onboards operators, controls access, and curates the metrics each one sees.

Most to-do apps treat productivity as a solo grind. TaskBuddy pairs a daily task and calendar view with a community feed, so people can share progress and celebrate achievements together, turning task management into something social and motivating.

Introducing who am I and what I build at a glance. My first personal portfolio is a single-page site with a low-poly hero that opens with “Hello, I’m Hallen, a web developer,” leading into the sections that frame my work, built and shipped on GitHub Pages.

Adding weather ambience to a web app usually means heavy assets, video loops, or libraries that fight the layout beneath them. Weather Maker is a scoped, dependency-free overlay that paints rain, storm, and snow with pure CSS (parallax, wind gusts, lightning, ground mist) and synthesizes rain and thunder through the Web Audio API with no sound files.

Mapping how users move through a product usually means scattered notes or heavyweight diagramming tools that were never built for flows. Flowboard is a focused, canvas-based editor for sketching and structuring user flows: drop screens, decisions, and connectors onto an infinite grid, kick off from templates like onboarding, checkout, or sign-up, and export the result.