We build software that
Expertstack crafts secure, scalable software products and services that help modern businesses move faster from enterprise platforms to developer tooling.
Trusted by leading organisations
For over half a decade, Vonage has been the communications backbone behind every product we ship, covering programmable voice, PSTN calling, real-time messaging and verification APIs. Our depth across their full CPaaS ecosystem earned us recognition as Vonage's Best Development Partner in 2025, placing us among the most trusted engineering teams in their global network. From Secured Calls to enterprise omnichannel platforms, we have turned Vonage's powerful API stack into real business outcomes for clients across 12 countries.
Partner
Products we've built
Real software solving real problems, deployed at scale, trusted by enterprises.
Secured Calls
We help businesses showcase their brand with secured, trusted & verified calls — displaying your logo and name to every recipient, eliminating unknown caller anxiety and dramatically boosting answer rates.
Unknown numbers create anxiety — 73% of calls go unanswered
Up and Running in 4 Steps
From zero to live branded calls, faster than you'd expect.
Register
Create your business account and verify your identity in minutes.
Integrate
Embed our lightweight SDK into your iOS or Android application.
Brand
Upload your logo, set call intent messages and configure your numbers.
Launch
Go live with verified, trusted branded calls, instantly.
Services built for the
modern stack
From zero to production, we cover every layer of your software stack with precision engineering, design, and AI built into every layer.
AI-First product engineering
We embed AI deeply into every product we build, not as a feature, but as a foundation. From LLM-powered workflows and RAG pipelines to autonomous agents and intelligent UIs, we help businesses harness AI to deliver exceptional quality, speed, and personalisation at scale.
Product Engineering
End-to-end software product development, from architecture to production. We move fast without breaking things.
Mobile Development
Native iOS & Android and cross-platform apps built to perform at scale with polished, accessible UIs.
Security & Privacy
Privacy-first architecture and security audits. We build systems that earn user trust by default.
Cloud Infrastructure
Scalable, resilient cloud architectures on AWS, GCP, and Azure with 99.9% SLAs.
API & SDK Development
Developer-grade APIs and SDKs that are a joy to integrate. Clean docs. Reliable SDKs.
Design Systems
Cohesive component libraries and design tokens that keep your product consistent at any scale.
Technical Consulting
Architecture reviews, due diligence, and strategy sessions with engineers who've shipped at scale.
We build software that lasts
Expertstack is a software company founded by engineers who got tired of mediocre tooling. We partner with ambitious teams to craft secure, elegant software, from MVPs to enterprise platforms.
Our flagship product, Secured Calls, is proof: a complex communications infrastructure problem, solved with precision, shipped globally, and trusted by enterprises and telcos like Orange and Vonage.
Trusted by teams who ship
"ExpertStack has been an outstanding partner for Vonage across ANZ. As our preferred DevOps partner in the region, they consistently deliver high-quality, scalable solutions built on Vonage APIs. Together, we've powered over a dozen critical communication projects, helping enterprises transform customer engagement, strengthen KYC processes, and in some cases, support applications where timely communication can genuinely save lives. Their technical depth, execution speed, and dedication to customers make them a truly invaluable partner."
Let's build something remarkable together
Whether you're launching a product, scaling infrastructure, or integrating branded communications, we're the team that ships.
Talk to our
engineering team
No sales pitch. Just an honest conversation about your project, your challenges, and how we can help you ship faster.