Now building: PulseCity — realtime city discoveryRead →

Products and platforms, engineered to scale.

ELDA is a software company from Germany. We design, build and operate mobile apps, realtime backends and cloud systems — for our own products and for selected partners.

Start a projectExplore PulseCity
NowTonightCultureFood
Speicher 7 — Rooftop
Live set · 350 m
Very busy128 here now
Product-ledWe build and run our own products.
Realtime by defaultLive data, not stale pages.
End-to-endStrategy, design, code and cloud.
Made in GermanyGDPR-first, EU hosting options.
Flagship product

PulseCity turns the city map into a live canvas.

A realtime social map that shows where life is happening right now — heatmaps, venues, events and conversations, without sponsored pins or endless feeds.

Read the case study →

Live geospatial heatmaps

Density surfaces reveal lively quarters in real time — aggregated, never exposing individual locations.

Fluid map rendering

Hardware-accelerated Mapbox GL layers with spring-physics camera motion.

60fps target

Venue rooms

Realtime chat and stories attached to places — coordinate a night out as it happens.

message.sentvenue:speicher-7
presence.join+1 online

Viewport streaming

Clients subscribe only to deltas inside their visible map area. Less bandwidth, longer battery.

await hub.SubscribeViewport(bbox, zoom);
on("venue.delta", applyPatch);

Built to scale out

Stateless ASP.NET Core services, Redis pub/sub and zone-partitioned SQL Server Spatial indexes.

zone.hamburg-nordpartition 03
zone.altonapartition 07
Architecture

Four tiers. Each one does one job well.

Rendering is decoupled from state synchronisation, so the map stays smooth even when the city gets loud.

01

Mobile client

Map rendering and offline-first local cache.

FlutterDartMapbox GL
02

Realtime gateway

Duplex WebSocket multiplexing and presence.

SignalRRedis
03

Spatial & business API

Domain logic, clustering and authentication.

ASP.NET CoreC#Firebase
04

Data & indexing

Geography queries and spatial indexes.

SQL Server SpatialAzure
Work with us

The team that builds PulseCity can build yours.

We take on a small number of partner projects where engineering quality matters.

All services →

Mobile & product

Concept to App Store, with interfaces that feel effortless.

  • Product strategy & UX
  • Flutter for iOS and Android
  • Next.js web applications

Realtime platforms

APIs, event streams and data models that stay fast under load.

  • ASP.NET Core & C#
  • SignalR / WebSockets
  • SQL Server · PostgreSQL · Redis

Cloud & operations

We ship and we stay — deployments, monitoring and iteration.

  • Azure & Vercel
  • CI/CD · Docker
  • Observability
How we work

Deliberate, from first sketch to continuous evolution.

Great software is never accidental. It comes from architectural clarity, honest prototyping and a high bar for how a product feels.

  1. 01

    Discover

    We map the problem, the constraints and the baseline before proposing anything.

  2. 02

    Define

    Data models, API contracts and key interactions are specified before production code.

  3. 03

    Design

    Interfaces with clear hierarchy, rhythm and restraint — no decoration for its own sake.

  4. 04

    Build

    Typed, tested and modular codebases on modern toolchains.

  5. 05

    Launch

    Observable, zero-downtime releases with load validation.

  6. 06

    Evolve

    Measured iteration based on real usage and telemetry.

Contact

Let’s build what’s next.

Tell us about your product. We reply within 48 hours.

Start a projectinfo@el-da.com