Web App Development Services

Building and scaling web apps in 2025 can be tough .

If you're integrating complex systems, adding AI/ML, or moving away from outdated tech, existing project setups or conflicting internal priorities can cause delays and only increase tech debt.

Choosing an external engineering partner without experience in these areas can lead to bad choices that compound, delays, and extra costs.

At STX Next, we excel at creating scalable and maintainable solutions, smoothly integrating into your existing setup. We design them to handle any complex needs and grow with you.

Tell us about your web app development needs

Our web developers can join your project in under 2 weeks and immediately start delivering secure, scalable solutions.

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Custom Web Applications

Our approach goes beyond basic CRUD applications to create complex, high-availability systems customized for your unique business processes. We design sophisticated data models, implement detailed business logic, and provide strong error handling for mission-critical applications.

Scalable SaaS & Multi-Tenant Platforms

We build SaaS products from the ground up to ensure exponential growth and strong security. Our expertise includes effective tenant isolation, resource management, metering and billing integrations, and creating architectures that support growing feature sets without sacrificing performance.

High-Performance eCommerce Engines

Handling more than the standard storefront, we build custom eCommerce frameworks with advanced inventory management, dynamic pricing strategies, complex promotion rules, and seamless ERP/PIM/WMS integration for retailers handling high volumes.

Legacy Web Systems Modernization

We don't just lift-and-shift; we strategically disentangle monolithic applications to migrate core functionalities to modern, microservices-based architectures on Cloud platforms. Our approach involves a deep analysis, phased rollouts, and ensuring minimal disruption, all while improving maintainability, scalability, and security.

AI/ML in Web Applications

With a solid foundation in Python and AI/Data engineering, we integrate machine learning models, such as recommendation engines and predictive analytics, into your web applications, adding intelligent features that translate to real-world benefits.

Inclusive & Accessible Web Solutions

We incorporate accessibility best practices in compliance with standards like the Web Accessibility Directive and WCAG 2.1, ensuring your applications reach a wider audience. Our commitment to inclusion helps prevent legal risks, fosters user trust, and opens your business to new opportunities by welcoming individuals of all abilities.

Complex API Ecosystems

Designing and implementing secure, well-documented API gateways and microservices is our forte. We offer smooth and reliable data exchange between systems, mobile clients, and third-party integrations, improving overall system harmony.

Tech stack for web app development

We bring deep web app development expertise to choose the right tools for your particular needs.

Languages & Frameworks

Python (Django, Flask, FastAPI), Node.js (Express.js, NestJS), .NET, React, React Native, Angular, Vue.js, TypeScript

Databases & Storage

PostgreSQL, MySQL, MongoDB, Redis, Elasticsearch, Cassandra, SQL Server, S3, Data Lakes

Cloud & Infrastructure

AWS, Azure, GCP, Docker, Kubernetes, Terraform, Serverless Architectures

AI/ML & Data

TensorFlow, PyTorch, scikit-learn, pandas, NumPy, Spark, Airflow, ML Ops platforms

APIs & Messaging

REST, GraphQL, gRPC, RabbitMQ, Kafka

DevOps & Quality

Jenkins, GitLab CI, GitHub Actions, Prometheus, Grafana, ELK Stack, Cypress, Selenium, Pytest, SonarQube

Way of Working

Scrum, Kanban, Extreme Programing(XP), custom approach (e.g. hybrid), DevOps, Test-Driven Development (TDD), Behavior-Driven Development (BDD), Product Management, Project management, Waterfall, Prince2 Agile

Why STX Next?

When complexity demands specialists, STX Next stands out among leading web development companies for your web application development services.

Engineers, Not Just Developers

Our team of over 500 specialized engineers evolved from Python pioneers to AI & Data leaders. We solve the hard technical problems generalists shy away from.

Decades of Experience

Our 20+ years of experience and focus on architecture, testing, and security best practices significantly reduce the risk of project failure, technical debt, and costly mistakes.

Specialized Expertise

Need complex AI integration, massive data handling, or intricate backend logic within your web app? That's our sweet spot. We bring niche skills you can't easily hire or find in generalist firms.

Reliable Processes

Our mature, battle-tested processes ensure transparency and minimize surprises, delivering complex projects more reliably than less experienced teams.

Strategic Technical Partnership

We provide more than code; we offer proactive technical guidance, challenge assumptions constructively, and make sure the solution aligns with your long-term business goals.

Proven Problem Solvers

A track record of successfully untangling complex legacy systems, architecting for massive scale, and delivering innovative features others deemed impossible.

Industries we serve

At STX Next, we offer you expert web solutions support. Our adaptable web app development services are tailored to meet unique challenges of various industries, no matter the complexity, data, or scale. Explore some sectors from our portfolio:

Finance

When it comes to handling money, there's no room for error. We help financial players stay sharp and secure with our tailored web solutions.

Spotting fraud before it happens

With our AI-driven analytics, financial institutions can catch fishy transactions and keep fraudsters at bay.

Building safe havens for users

Develop secure, user-friendly banking platforms that protect every click and keystroke, making customers feel at ease.

Smooth sailing between systems

Set up smooth API integrations so your systems and third-party apps talk without a hitch, making your workflow a walk in the park.

Healthcare

The way we see it, healthcare should be accessible, secure, and smart. Our web revamps aim to do just that.

Your health in your hands

Create personalized portals where patients can easily check up on their medical records and appointments, without the hassle.

Smarter diagnostics, better outcomes

Equip healthcare providers with AI tools that offer timely insights, lending a hand in patient diagnosis and care.

Breaking down barriers

Ensure telehealth platforms are user-friendly for everyone, meeting high accessibility standards and ensuring no patient is left out.

SaaS

SaaS platforms need to keep pace with growth without breaking a sweat. That’s where we step in.

Growing with you, seamlessly

Create SaaS platforms that expand effortlessly and securely as your client base grows, keeping everything neat and tidy.

Billing made simple

Integrate smart metering and billing systems so you can focus on delivering, not dollar chasing.

Backend that’s got your back

Develop strong backend systems that keep your SaaS product flowing like a well-oiled machine.

eCommerce

Click, buy, repeat. That’s the experience we aim to deliver with our innovative eCommerce solutions.

Keep your stock organized

Implement advanced inventory management so your stock levels are more accurate than ever.

Flexible pricing, happy customers

Develop adaptive pricing tools that let you adjust prices on the fly, always staying a step ahead of the market.

Retail harmony

Seamlessly connect ERP, PIM, and WMS, turning complex sales processes into a symphony of efficiency.

Manufacturing

Manufacturing moves fast, and your tech should keep up without skipping a beat.

Streamlining production

Build web apps that keep an eye on production lines, making sure everything’s running as smooth as silk.

Supplier talk made easy

Set up APIs that make data exchange a breeze so that manufacturers and suppliers are always in sync.

Real-time insights

Develop IoT-enabled monitoring systems that keep tabs on machinery, ensuring your operations are always in top gear.

Education

Learning should be engaging and accessible, no matter where or how it happens. Our solutions get straight A's.

Tailored learning journeys

Design custom LMS platforms that cater to every educational style, making learning a breeze.

Open for everyone

Create educational portals with top-notch accessibility, welcoming students of all abilities with open arms.

Academic insights at your fingertips

Use AI to provide educators with the predictive insights they need, helping to guide each student’s progress.