Realtime Mobile App Development
Live data, instant updates, event-driven mobile experiences
We build mobile applications that thrive on realtime data — chat, live dashboards, collaborative tools, fleet tracking, IoT monitoring and trading platforms. Our stack handles thousands of concurrent connections with sub-100ms latency.
Sub-second mobile experiences when seconds cost revenue
Some products live or die in milliseconds — live sports betting, ride dispatch, food delivery tracking, trading platforms, collaborative tools, IoT control rooms. We build the realtime mobile and backend stack that keeps thousands of concurrent users in lockstep, with end-to-end latency below 100 ms and a graceful degradation story for the moments when the network disagrees.
We design the whole pipeline: WebSocket and MQTT fan-out, push notification orchestration, on-device merge strategies for offline writes, observability that tells you exactly which user saw which state when. The result is products that feel alive — not products that occasionally update.
Why this engineering choice matters
Sub-100ms end-to-end
Cell-aware WebSocket reconnection, snapshot + delta protocols, and prioritised push channels keep perceived latency under 100 ms for the user.
Backpressure-aware fan-out
Per-channel quotas, drop-and-replay policies and graceful degradation when one tenant generates a thundering-herd event.
Offline-first with conflict resolution
CRDTs (Yjs/Automerge) or vector-clock strategies for products where the device must keep working without a connection.
Observability for invisible problems
Per-event tracing from app to broker to storage, so you can answer 'why didn't this update arrive?' in seconds, not days.
Realtime auth that scales
Per-channel scoped tokens, short-lived JWTs, on-the-fly authorisation checks without round-trips to the auth server.
Operational realtime
Synthetic clients in every region, alerting on tail latency, weekly drill exercises and a clear runbook for the 3am incident.
Core App Capabilities
WebSocket and MQTT realtime channels
Persistent secure channels with reconnection, backpressure, snapshot + delta and per-channel auth.
Push and in-app alert orchestration
FCM, APNs, Live Activities, Dynamic Island and SMS escalation with deduplication and prioritisation.
Offline-first sync engine
CRDTs or vector clocks for conflict-free merges, MMKV/Realm storage and store-and-forward queues.
Stream processing and event sourcing
Kafka, NATS JetStream or Redpanda with Faust/Flink consumers for stateful event handling.
Realtime authorisation at scale
Per-channel scoped tokens, OPA/Rego policies and on-the-fly entitlement checks.
End-to-end observability
OpenTelemetry traces from app to broker, per-tenant SLO dashboards and tail-latency alerting.
Ideal Business Use Cases
Chat apps, live sports betting, ride-hailing, food delivery tracking, multiplayer games, trading platforms and any product where seconds matter.
Technology Stack
- Kotlin
- Java
- Swift
- React Native
- Flutter
- FastAPI
- Laravel
- Node.js
- REST APIs
- GraphQL
- WebSockets
- PostgreSQL
- MongoDB
- MySQL
- Redis
- Firebase
- Docker
- Kubernetes
- CI/CD
- Cloud Infrastructure
- Monitoring
Industries we deliver this to
How we deliver this engagement
Latency budget definition
Written end-to-end latency budget per user journey, with measurement points at app, network, broker, processor and database.
Protocol selection
WebSocket, MQTT, gRPC streams, SSE or hybrid — chosen per use case and documented with the trade-off analysis.
Resilient client implementation
Reconnect with exponential backoff, snapshot+delta resync, cell-network-aware throttling and offline queueing.
Stream-processing backend
Kafka/NATS/Redpanda with stateful processors, idempotent consumers and replayable event logs.
Realtime chaos testing
Synthetic clients in every region, network-fault injection and tail-latency regression gates in CI.
Run with realtime SLOs
Per-tenant SLO dashboards, tail-latency alerting, weekly drills and a documented incident playbook.
Security posture
- Per-channel scoped JWTs with short TTL and rotation
- mTLS between mobile and broker for sensitive workloads
- OPA/Rego authorisation policies evaluated on every event
- GDPR-compliant retention with replayable event logs
- End-to-end encryption option for high-sensitivity channels
- Audit logging of every privileged realtime command
Scalability engineering
- Horizontally scaled WebSocket gateways with sticky sessions
- Kafka / NATS JetStream for durable event sourcing
- Stateful processors with checkpointing and replay
- Read replicas and CQRS for query-heavy dashboards
- Multi-region active/active with conflict-aware merges
- Backpressure-aware fan-out with drop-and-replay
Questions we answer most often
Ready to build a mobile platform that scales?
From discovery to launch and beyond — we partner with enterprises across the EU and Balkans to deliver mobile applications that perform under load, comply with regulation and grow with your business.