Web and mobile app development
Websites, booking platforms, SaaS products and mobile apps, designed around your users and engineered for speed, search and scale.
What is web and mobile app development?
Web and mobile app development is designing, building and launching the websites, web platforms and phone apps a business runs on. At Syntalix it covers the interface, the backend and APIs, hosting and performance, with search visibility and security built in from the first release.
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What we build
Web applications
Server-rendered React, Next.js and Astro applications with fast loads, accessibility and SEO built in.
SaaS platforms
Multi-tenant products with subscription billing, role-based access and usage analytics.
Mobile apps
Cross-platform React Native apps for iOS and Android, or native Swift and Kotlin when performance demands it.
APIs and backends
Node.js and Python (FastAPI, Django) services with clean REST or GraphQL APIs and well-modelled databases.
Performance and Core Web Vitals
Audits and fixes for load time, bundle size, caching and database queries on existing products.
Security
OWASP-aligned code, secrets management and data handling that respects privacy rules.
Related client work
Delivered for clients, not demos.
A booking, payments and tracking platform for a logistics company
The production website and booking platform: instant quotes, three-step booking with live payments, waybill tracking and an operations admin panel.
Astro, Node, SQLite, RazorpayLegal IndiaA consultation-booking website for a legal services firm
Design, build, SEO and an online consultation flow.
RAYS & RZILSSAn admissions website for a pharma training institute
Design, build, SEO and lead capture for admissions.
How a project runs
Discovery
Users, business rules, integrations and growth plans, captured in an architecture and a prioritised backlog.
Design
Wireframes and high-fidelity designs you approve before any build starts.
Build in sprints
Two-week sprints with demos on a preview link and a shared task board.
Test and launch
Automated tests, cross-device checks and a zero-downtime release with documentation handed over.
Tools we work with
Chosen per project; we are not tied to one provider.
Questions about web and mobile apps
How long does a website or web app take?
It depends on scope: a marketing site is far quicker than a booking platform or SaaS product. After a free scoping call you get a written plan with a timeline and a fixed quote, so you know when it ships and what it costs before any work starts.
Do you build mobile apps as well?
Yes. We build cross-platform apps with React Native, so one codebase ships to both iOS and Android. When an app needs maximum performance or deep device features, we build natively in Swift and Kotlin instead. Web and mobile can share the same backend and APIs.
Will the site be good for SEO?
Yes. SEO is built in from the start rather than added later. Pages are server-rendered, load fast and pass Core Web Vitals, with clean URLs, structured data, canonical tags and an XML sitemap. That gives Google and AI answer engines a site they can crawl and understand.
Who owns the code?
You do. When the project ends we hand over the full source code, designs, hosting and third-party accounts, and documentation for running it. There is no lock-in, so your own team or another agency can take over at any time.
Related services
LLM engineering
Retrieval-augmented assistants, fine-tuned models and guardrails that hold up in production.
Answer engine optimisation
Structure your site so ChatGPT, Perplexity and Google AI can find and cite you.
AI and ML infrastructure
Data pipelines, model serving and monitoring on AWS, GCP or Azure.
Tell us what you want to build
A free 30-minute scoping call with the engineers who would build it. You leave with a clear next step, whether or not we work together.