Ships end-to-end
I'm comfortable across the whole stack — the interface, the APIs behind it, the database, the cloud, and the deployment. I can take a feature from an idea to running in production on my own.
HANK KARPINEN · FULL-STACK ENGINEER · OPEN TO ROLES
A full-stack app,
built from scratch.
I'm a full-stack software engineer — 4+ years' experience, AWS certified. This whole website is a working app I built myself, front to back, so you can see what I do instead of just reading about it. Click Try the demo — no signup, no email, you're in within seconds.
// No account needed · Demo resets nightly · No data persists
4+
Years exp
30+
Screens built
AWS
Certified
OPEN
To roles
// WHAT I BRING
More than someone who writes code.
This site isn't a tutorial project — it's production-quality software I designed, built, and shipped on my own. Here's what that says about how I'd work on your team. (Engineers: the technical breakdown is one click away.)
Modernizes legacy systems
My day job is turning old, hard-to-maintain systems into modern, scalable ones — the kind of work that keeps a business moving instead of stalling on a rewrite that never ships.
Quality-minded by training
I started in QA, so I build with testing, reliability, and the tricky edge cases in mind from day one — not bolted on at the end.
Communicates and leads
Certified ScrumMaster. I run agile ceremonies, scope work directly with stakeholders, and keep non-technical partners in the loop the whole way through.
// EXPLORE
Real, working features — click any of them.
These aren't screenshots. Every one is a live feature you can use right now. A couple are open to everyone; the rest open instantly with the one-click demo — no signup, no email.
// MODULE_01
Weather
City search, °F/°C toggle, Leaflet map.
ASP.NET CoreOpenWeatherLeaflet
OPENOpen
// MODULE_02Convert
Length, mass, temp, volume, speed, area, data.
ASP.NET CoreDDDReact Query
OPENOpen
// MODULE_03Household
Shared ledger, splits, calendar, chores.
ASP.NET CoreEF CorePostgresMassTransit
LOGINSign in
// MODULE_04Forum
Threaded discussions, votes, mod queues.
ASP.NET CoreSSEJWTMassTransit
LOGINSign in
// MODULE_05Finance
Personal expenses & income tracking.
ASP.NET CoreRabbitMQPostgresReact Query
LOGINSign in
// ABOUT ME
Hi, I'm Hank Karpinen.
Full-stack software engineer based in Pullman, WA. I started in QA, moved into building software, and now modernize older systems into modern, scalable apps. AWS Certified Solutions Architect and ScrumMaster, 4+ years' experience. Open to senior & staff roles.
Languages & Frameworks
C#.NETASP.NETTypeScriptJavaScriptReactNext.jsNode.jsPythonGroovy
Architecture
MicroservicesDomain-Driven DesignRESTful APIsEvent-Driven (RabbitMQ)Legacy ModernizationSystem Design
Cloud & DevOps
AWSAzureDockerCI/CDGitContainerization
Data
OraclePL/SQLSQLMongoDBDynamoDBMariaDBData Pipelines
Testing & QA
Automated TestingSeleniumAPI TestingTestRailTest Design
Leadership & Agile
Certified ScrumMasterSprint PlanningRetrospectivesStakeholder Collaboration