Technology

The stack we run in production

Every tool on this page is part of how ExStack delivers web and mobile products for startups and growing businesses — not a wish list, but the stack our teams use daily to build, deploy, and support software in production.

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Application Stack

Web application foundation

A modern full-stack pairing — type-safe frontends on Next.js and resilient APIs on Node.js and Python — designed for performance, SEO, and maintainable delivery.

Frontend

React

Role: Component-based UI library for interactive web interfaces
In production: Dashboards, marketing sites, and complex SPAs with reusable design systems

Next.js

Role: React framework with SSR, routing, and edge-ready deployment
In production: SEO-critical web apps, SaaS frontends, and content-driven sites

TypeScript

Role: Typed JavaScript across frontend and backend codebases
In production: All greenfield projects for safer refactors and faster onboarding

Figma

Role: Collaborative UI design and prototyping
In production: Design-to-dev handoff with component specs and responsive layouts

Web application foundation — Frontend
Technology	Role	In production
React	Component-based UI library for interactive web interfaces	Dashboards, marketing sites, and complex SPAs with reusable design systems
Next.js	React framework with SSR, routing, and edge-ready deployment	SEO-critical web apps, SaaS frontends, and content-driven sites
TypeScript	Typed JavaScript across frontend and backend codebases	All greenfield projects for safer refactors and faster onboarding
Figma	Collaborative UI design and prototyping	Design-to-dev handoff with component specs and responsive layouts

Backend

Node.js

Role: JavaScript runtime for APIs, workers, and real-time services
In production: REST and GraphQL APIs, webhooks, and background job processors

Express

Role: Minimal HTTP framework for Node.js services
In production: Lightweight APIs and microservices where flexibility matters

Python

Role: Backend services, data pipelines, and AI workloads
In production: ML inference endpoints, ETL scripts, and automation services

GraphQL

Role: Flexible query layer for typed API contracts
In production: Mobile and web clients sharing a single schema-driven API

MongoDB

Role: Document database for flexible, schema-evolving data
In production: Product catalogs, user profiles, and content-heavy applications

WebSockets

Role: Persistent bidirectional client-server connections
In production: Live dashboards, chat, notifications, and collaborative features

Web application foundation — Backend
Technology	Role	In production
Node.js	JavaScript runtime for APIs, workers, and real-time services	REST and GraphQL APIs, webhooks, and background job processors
Express	Minimal HTTP framework for Node.js services	Lightweight APIs and microservices where flexibility matters
Python	Backend services, data pipelines, and AI workloads	ML inference endpoints, ETL scripts, and automation services
GraphQL	Flexible query layer for typed API contracts	Mobile and web clients sharing a single schema-driven API
MongoDB	Document database for flexible, schema-evolving data	Product catalogs, user profiles, and content-heavy applications
WebSockets	Persistent bidirectional client-server connections	Live dashboards, chat, notifications, and collaborative features

Mobile Development

Cross-platform mobile delivery

React Native and Expo for shared iOS and Android codebases, with native tooling and store pipelines when your release process demands it.

React Native

Role: Cross-platform mobile framework with native modules
In production: iOS and Android apps from a single TypeScript codebase

Expo

Role: React Native toolchain for builds, OTA updates, and dev velocity
In production: Faster MVP cycles and streamlined store submission workflows

Android Studio

Role: Native Android IDE for builds, emulators, and debugging
In production: Release builds, native module integration, and Play Store packaging

Xcode

Role: Native iOS IDE for builds, simulators, and App Store signing
In production: iOS release pipelines, native bridges, and store compliance checks

App Store

Role: Apple distribution and release management
In production: TestFlight beta programs and production App Store submissions

Cross-platform mobile delivery
Technology	Role	In production
React Native	Cross-platform mobile framework with native modules	iOS and Android apps from a single TypeScript codebase
Expo	React Native toolchain for builds, OTA updates, and dev velocity	Faster MVP cycles and streamlined store submission workflows
Android Studio	Native Android IDE for builds, emulators, and debugging	Release builds, native module integration, and Play Store packaging
Xcode	Native iOS IDE for builds, simulators, and App Store signing	iOS release pipelines, native bridges, and store compliance checks
App Store	Apple distribution and release management	TestFlight beta programs and production App Store submissions

AI & Machine Learning

AI models and agent tooling

LLM APIs, agent frameworks, and AI-native development workflows integrated into products — with guardrails, observability, and cost control built in.

OpenAI API

Role: GPT models for text generation, embeddings, and assistants
In production: Chat features, content generation, and semantic search backends

Claude API

Role: Anthropic models for reasoning-heavy and long-context tasks
In production: Document analysis, code assistance, and multi-step agent workflows

Python

Role: Backend services, data pipelines, and AI workloads
In production: ML inference endpoints, ETL scripts, and automation services

AI Agents

Role: Autonomous task runners with tools and memory
In production: Support automation, data enrichment, and internal ops assistants

Cursor

Role: AI-assisted development environment
In production: Accelerated delivery with AI pair programming on client projects

Cloude AI

Role: Cloud-hosted AI services and model orchestration
In production: Managed inference and model routing for production AI features

AI models and agent tooling
Technology	Role	In production
OpenAI API	GPT models for text generation, embeddings, and assistants	Chat features, content generation, and semantic search backends
Claude API	Anthropic models for reasoning-heavy and long-context tasks	Document analysis, code assistance, and multi-step agent workflows
Python	Backend services, data pipelines, and AI workloads	ML inference endpoints, ETL scripts, and automation services
AI Agents	Autonomous task runners with tools and memory	Support automation, data enrichment, and internal ops assistants
Cursor	AI-assisted development environment	Accelerated delivery with AI pair programming on client projects
Cloude AI	Cloud-hosted AI services and model orchestration	Managed inference and model routing for production AI features

AI & Knowledge Layer

Knowledge systems and automation

Retrieval, integrations, and workflow automation that turn documentation and business data into actionable AI features your users can trust.

AI Integrations

Role: Embedding LLM capabilities into existing products
In production: In-app copilots, smart search, and automated content workflows

Workflow Automation

Role: Event-driven pipelines connecting tools and data sources
In production: CRM sync, invoice processing, and cross-system data flows

Vector RAG

Role: Retrieval-augmented generation over vector embeddings
In production: Knowledge-base Q&A, doc search, and context-aware AI responses

Knowledge Base

Role: Structured documentation indexed for AI retrieval
In production: Product help centers, internal wikis, and support deflection

Knowledge systems and automation
Technology	Role	In production
AI Integrations	Embedding LLM capabilities into existing products	In-app copilots, smart search, and automated content workflows
Workflow Automation	Event-driven pipelines connecting tools and data sources	CRM sync, invoice processing, and cross-system data flows
Vector RAG	Retrieval-augmented generation over vector embeddings	Knowledge-base Q&A, doc search, and context-aware AI responses
Knowledge Base	Structured documentation indexed for AI retrieval	Product help centers, internal wikis, and support deflection

Security & Compliance

Security by design

Authentication, encryption, and privacy practices embedded from architecture through deployment — so your product meets user expectations and regulatory requirements.

OAuth & JWT

Role: Authentication and authorization standards
In production: Social login, API tokens, and role-based access control

Encryption

Role: Data protection at rest and in transit
In production: TLS everywhere, encrypted storage, and secure credential handling

GDPR

Role: EU privacy compliance practices
In production: Consent flows, data export, and retention policies in user-facing products

Security by design
Technology	Role	In production
OAuth & JWT	Authentication and authorization standards	Social login, API tokens, and role-based access control
Encryption	Data protection at rest and in transit	TLS everywhere, encrypted storage, and secure credential handling
GDPR	EU privacy compliance practices	Consent flows, data export, and retention policies in user-facing products

DevOps & Delivery

Infrastructure and release pipelines

Containerized deployments, cloud platforms, and CI/CD pipelines that keep releases predictable and production environments observable.

Docker

Role: Container packaging for consistent environments
In production: Local dev parity and portable deployment artifacts

Kubernetes

Role: Container orchestration at scale
In production: Auto-scaling services and zero-downtime rolling deployments

CI/CD

Role: Automated build, test, and deploy pipelines
In production: GitHub Actions workflows with linting, tests, and staged releases

AWS

Role: Cloud infrastructure and managed services
In production: Compute, storage, queues, and serverless functions for production workloads

Google Cloud

Role: Cloud platform for compute, data, and AI services
In production: Cloud Run, BigQuery integrations, and GCP-native AI tooling

Firebase

Role: Backend-as-a-service for auth, database, and push
In production: MVPs, mobile backends, and real-time data sync

GitHub

Role: Source control, code review, and collaboration
In production: Branch protection, PR workflows, and release tagging

CDN

Role: Global edge caching for static assets and pages
In production: Sub-second load times and DDoS mitigation at the edge

Monitoring & Analytics

Role: Observability, error tracking, and product analytics
In production: Uptime alerts, performance dashboards, and user behavior insights

Infrastructure and release pipelines
Technology	Role	In production
Docker	Container packaging for consistent environments	Local dev parity and portable deployment artifacts
Kubernetes	Container orchestration at scale	Auto-scaling services and zero-downtime rolling deployments
CI/CD	Automated build, test, and deploy pipelines	GitHub Actions workflows with linting, tests, and staged releases
AWS	Cloud infrastructure and managed services	Compute, storage, queues, and serverless functions for production workloads
Google Cloud	Cloud platform for compute, data, and AI services	Cloud Run, BigQuery integrations, and GCP-native AI tooling
Firebase	Backend-as-a-service for auth, database, and push	MVPs, mobile backends, and real-time data sync
GitHub	Source control, code review, and collaboration	Branch protection, PR workflows, and release tagging
CDN	Global edge caching for static assets and pages	Sub-second load times and DDoS mitigation at the edge
Monitoring & Analytics	Observability, error tracking, and product analytics	Uptime alerts, performance dashboards, and user behavior insights

Integrations

APIs and third-party connectivity

REST, GraphQL, WebSockets, and SDK integrations that connect your product to payment providers, CRMs, analytics, and the tools your business already runs on.

Postman

Role: API design, testing, and documentation
In production: Contract validation, integration testing, and team API collections

GraphQL

Role: Flexible query layer for typed API contracts
In production: Mobile and web clients sharing a single schema-driven API

WebSockets

Role: Persistent bidirectional client-server connections
In production: Live dashboards, chat, notifications, and collaborative features

REST APIs

Role: HTTP-based resource interfaces for integrations
In production: Third-party connectors, webhooks, and public developer APIs

Third-Party SDKs

Role: Vendor libraries for payments, maps, messaging, and more
In production: Stripe, Twilio, SendGrid, and domain-specific service integrations

APIs and third-party connectivity
Technology	Role	In production
Postman	API design, testing, and documentation	Contract validation, integration testing, and team API collections
GraphQL	Flexible query layer for typed API contracts	Mobile and web clients sharing a single schema-driven API
WebSockets	Persistent bidirectional client-server connections	Live dashboards, chat, notifications, and collaborative features
REST APIs	HTTP-based resource interfaces for integrations	Third-party connectors, webhooks, and public developer APIs
Third-Party SDKs	Vendor libraries for payments, maps, messaging, and more	Stripe, Twilio, SendGrid, and domain-specific service integrations

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