software products with an entrepreneurial mindset
a copenhagen software company. we consult, build for clients, and ship our own products.
what we do
a focused practice — selective about engagements, deliberate in execution.
consulting
it and software advisory for businesses — from architecture to hands-on problem solving.
web development
custom sites and applications for private and business clients, built to last.
products
we build and operate our own software for niche industries and internal use.
how we work
we work two ways: with established businesses on straightforward consultancy terms, and with early-stage startups we believe in, where we'll trade our fee for equity and build alongside the founders.
selected work
a sample of what we've built: our own products, and work delivered for clients.
jayday products
recapp
betaan ai briefing service that keeps professionals current in a narrow niche. describe your interests once and receive editorial email briefings synthesised from live sources, with every claim cited and independently fact-checked before it sends.
pokeros
a production saas that runs poker clubs end to end: membership, events, multi-flight tournaments, payments, and regulatory compliance. built solo on a dedicated-database-per-tenant architecture, and approved by the danish gambling authority.
gemmelegen
in developmenta real-world hide-and-seek game played across a city, inspired by jet lag: the game. seekers spend coins on questions that shrink the area where hiders can be, on a live map with background location tracking. all referee logic runs server-side in postgres with row-level security, so nobody can cheat.
client work
connected cars
white-label react and react native apps for a fleet and workshop platform, using feature flags and i18n to ship brand- and market-specific features safely. built a workflow app for mechanics installing hardware into thousands of semler vehicles.
zoios
a high-performance next.js platform giving leaders insight into employee well-being from continuous questionnaire data. full-stack work spanning ui, data processing, and cloud infrastructure.
gamerzclass
mobile lead for an esports coaching platform, later acquired by metafy. built the ios and android app solo in react native, plus a nuxt video-archive web app and a vue analytics dashboard for creators.
sureshot video
migrated a native ios app to a cross-platform react native app with full feature parity and an interface overhaul. started as a consultant, now an equity stakeholder on the team.
venner
a clean single-page site for venner, a copenhagen café, restaurant and bar. a light, quick build for a spot run by friends.
about
jayday technologies is a small software company based in copenhagen. we help businesses ship the software they need, and in parallel, we build products of our own.
our work spans the stack — from advising on architecture to delivering finished applications. we prefer focused engagements and long relationships.
contact
- johan.bagger@hotmail.com
- +45 22 48 58 12
- copenhagen, denmark