Software & Signal Engineering
Systems that
don't drop
the signal.
Constavo Systems builds telecom infrastructure, SaaS platforms, embedded hardware, and mobile software — end to end, without handing your project between vendors.
- FreeSWITCH
- SIP/XML
- React
- Swift · Kotlin
- Embedded C
1void render_waveform(float freq_x, float freq_y) {2 for (int t = 0; t < SAMPLE_RATE; t++) {3 x[t] = sin(freq_x * t);4 y[t] = sin(freq_y * t + phase);5 }6}Why Constavo
Built from the parts other agencies specialize away from.
Constavo comes from constancy — the reliability a system needs when it can't afford to go down — and moving forward, continually building. That's the actual discipline behind the work: telecom platforms where a dropped call isn't acceptable, financial systems where a miscalculation has real consequences, and hardware that has to work the first time it's powered on in someone's home.
— built and maintained end to end by constavo.
Field Log
- > deployed: SaaS telecom platform on FusionPBX / FreeSWITCH
- > maintained: custom SIP routing, XML dialplans, live production
- > rewrote: real-time audio visualizer, Python → C
- > shipped: production mobile app features — iOS + Android, analytics + content modules
- > built: SaaS lending platform — automated repayment engine, recovery workflows, retailer portal
- > designed: smart home switches + custom smartwatch hardware
TELECOM.SIP
Telecom infrastructure
Sole development and ongoing maintenance of a SaaS telecom platform built on FusionPBX and FreeSWITCH, including custom modules and SIP routing logic.
IOT.EMBEDDED
Embedded & IoT hardware
Smart home devices and a real-time audio visualizer originally prototyped in Python, rewritten in C for hardware-level performance.
SAAS.FINANCE
SaaS & financial systems
A full-stack SaaS platform for consumer financing — automated repayment tracking, recovery workflows, and a retailer-facing portal.
MOBILE.iOS/ANDROID
Production mobile engineering
Feature development on live, high-traffic apps — analytics integration and new modules shipped directly into production codebases.
What we build
One team, every layer.
[WEB]
Web development & full SaaS platforms
Web applications and complete SaaS systems, from database schema to deployed frontend.
- ›React / Next.js frontends
- ›Node / Python backends
- ›Postgres, deployed infra
[SAAS]
Custom CRM & ERP
Business systems built around how your operations actually run, not a generic template.
- ›Custom entity models
- ›Role-based access control
- ›Reporting & audit trails
[DESKTOP]
Windows & macOS software
Native and cross-platform desktop applications.
- ›Native macOS / Windows
- ›Cross-platform (Electron/Qt)
- ›System-level integration
[MOBILE]
iOS & Android apps
Mobile applications built for production, not prototypes.
- ›Swift / Kotlin native
- ›Feature work in live production apps
- ›Analytics & instrumentation
[IOT]
IoT & embedded systems
Hardware, firmware, and the companion apps that talk to them.
- ›Embedded C / Python
- ›Sensor & relay circuit design
- ›Companion app pairing
[TELECOM]
VoIP & telecom systems
FreeSWITCH, FusionPBX, SIP routing, and custom dialplans.
- ›FreeSWITCH / FusionPBX
- ›SIP trunking & routing
- ›Custom XML dialplans
How we work
No hand-offs. No black boxes.
01
Discovery
Understand the actual problem, constraints, and what 'done' looks like before any code gets written.
02
Architecture
The technical plan — stack, data model, integration points — reviewed with you before build starts.
03
Build
Iterative development with real visibility into progress, not a black box until delivery day.
04
Ship
Deployed, tested, and handed over with real documentation, not just a repo link.
05
Maintain
Ongoing support and iteration after launch — the constancy this company is built on.
Case Notes
A few things that shipped.
Notes from real projects, across the systems Constavo works in.
[TELECOM]
Telecom SaaS platform
Sole development and maintenance of a telecom SaaS platform, including custom modules and SIP call routing logic.
stack: FreeSWITCH · FusionPBX · SIP · XML dialplans
[FINANCE]
Lending & repayment SaaS platform
A full-stack SaaS platform for consumer financing — automated repayment tracking, recovery workflows, and a retailer-facing portal.
stack: Full-stack SaaS · relational DB · role-based access
[MOBILE]
Production mobile app features
Feature development on a live, high-traffic Android and iOS news app, including analytics integration and new content modules.
stack: Swift · Kotlin · production codebases
[IOT]
Smart home switches
Custom smart home switch hardware and firmware, built end to end.
stack: Embedded C · circuit design · relay control
[IOT]
Custom smartwatch
A touch-based smartwatch built from the ground up — hardware, firmware, and companion software.
stack: Embedded firmware · touch UI · low-power hardware
[IOT]
Real-time audio visualizer
A Raspberry Pi–based visualizer rendering music as live X-Y waveforms on an oscilloscope, prototyped in Python and rewritten in C for real-time performance.
stack: Raspberry Pi · Python → C
Common queries
Questions, answered directly.
Response //
Telecom, financial services, and general SaaS/mobile — but the underlying discipline, systems that can't afford downtime, transfers to most serious software projects.
Response //
Both. Plenty of the work in Case Notes was extending and maintaining existing systems, not building from zero.
Response //
Both, scoped upfront rather than left ambiguous. Some projects are a clean build-and-handoff; others need long-term support.
Response //
A conversation about what you're building and where it stands today. That's exactly what the project type field below is for.
Response //
Yes, standard for any project that requires one.
Start a project