Custom web software development for AI-ready products

Nexterse builds web products that support today's modern workflows and are ready for AI features. We design and develop secure custom web software and modernize legacy apps by preparing the backend with data flows and APIs needed for copilots, retrieval, automation, and model-driven features.

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Why make custom web apps with Nexterse?

Our team builds custom web applications for companies across industries and regions. We choose the technology stack based on business logic, scale, integration constraints, and long-term support requirements.
We use our ADLC alongside the standard web development process. We define the use case, prepare the data and retrieval layer, set evaluation criteria, and add monitoring. This helps reduce rework and makes it easier to move AI features from PoC to production.

less time to market

30% less time to market
with custom web development

reduction in project overhead

25% reduction in project overhead
through web consulting

success in reviving stalled projects

90% success in reviving stalled projects
through rescue missions

Custom web application development services

R&D & Analysis

Our R&D and business analysis team evaluates your business and ideas before launching development. We define the product scope, reduce market and technical risk, and prepare the system for future growth. If AI is part of the plan, we use ADLC from the start. We define where AI fits in the product, what data it can use, how results will be checked, and what controls the system needs before release.

  • Validate the business case and product scope
  • Choose the technology stack and integration approach
  • Estimate cost, effort, and delivery stages
  • Define the solution vision and release plan
  • Map AI use cases, data flows, and guardrails through ADLC
  • Reduce avoidable costs and late rework
Business analysis โ†’
R&D & Analysis

UX/UI design

We follow a thorough web design approach focused on how people interact with websites, ensuring interfaces are not only user-friendly but also designed for targeted action. For AI features, we account for response states, approval steps, citation patterns, and user control.

  • Research users, roles, workflows, and decision points
  • Build information architecture, navigation logic, screen structure, and content hierarchy
  • Create wireframes, prototypes, interface concepts, and design systems
  • Design for desktop, tablet, mobile, and mixed-device use
  • Shape AI interactions, review flows, fallback states, and user feedback patterns
  • Refine usability through testing, iteration, observation, and product input
UI/UX design โ†’
UX/UI design

Frontend & Backend development

Our frontend and backend engineers build custom web applications for products ranging in complexity. We focus on stable architecture and maintainable code. When AI is required, we add model-facing services, retrieval flows, orchestration logic, and monitoring via an ADLC-based process.

  • Integrate with third-party systems and internal platforms
  • Process, store, analyze, and expose large volumes of data
  • Enforce security across users, workflows, access rules, and data handling
  • Keep interfaces accurate, responsive, stable, and fast
  • Build scalable architecture for core logic, background jobs, AI services, and future growth
  • Support modernization, refactoring, extension, and phased replacement of legacy parts
Back-end development services โ†’
Frontend & Backend development

QA & Testing

Our QA team joins the project from day one. This lets us test the product as it is built and not after the main work is done. We cover functional quality, performance, security, and cross-device behavior. For AI-enabled features, we also test output quality, grounding, fallback behavior, and ADLC-defined monitoring rules.

  • Improve product quality throughout development
  • Keep the delivery progress visible and documented
  • Automate repeatable test flows, regression checks, smoke tests, and release checks
  • Reduce the risk of missed requirements, unstable releases, and hidden defects
  • Test AI behavior against defined evaluation criteria and fallback paths
  • Shorten release cycles through earlier defect detection and tighter feedback loops
Quality assurance โ†’
QA & Testing

Web applications we develop

We develop web applications tailored to specific business needs. We consider workflows, data structure, access rights, and integrations. If a project requires AI, we build it into the architecture from the start: we define scenarios, restrict data access, and establish quality criteria and control rules.

Enterprise web apps

We develop corporate web applications for internal operations and complex processes. These include ERP, CRM, HRM, billing systems, approval systems, and other tools that underpin a company's daily operations. We also add AI features when needed: internal assistants, corporate content search, document management, and automation of routine tasks based on roles and access rights.

Enterprise software development

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AI services integration

AI services integration

We integrate language models, retrieval, classifiers, and automation flows into web products where they support a defined business task.

AI integration into web apps
Zero-leakage security (RBAC)

Zero-leakage security (RBAC)

We enforce role-based access control and strict data boundaries so users, services, and AI features only access what they are allowed to use.

LLM-ready microservices

LLM-ready microservices

We structure backend services so that AI components can be added or updated without disrupting the core application.

Web development process

We run SDLC and ADLC as one process, so the web app and its AI layer are scoped, designed, built, tested, and released together.

1

Research

  • Interview stakeholders and review workflows
  • Define goals, users, constraints, and AI scope
2

Discovery

  • Set requirements, scope, milestones, and success criteria
  • Outline architecture, data flows, ADLC checks, and release logic
3

Design

  • Map key journeys and admin flows
  • Design screens, response states, citations, and approvals
4

Programming

  • Build frontend, backend, APIs, and integrations
  • Add retrieval, model routing, monitoring, and controls
5

QA and evaluation

  • Test logic, performance, security, and permissions
  • Review output quality, grounding, fallback paths, and logs
6

Launch

  • Prepare release, handover, monitoring, and support
  • Deploy the product and track system health
7

Improvement

  • Refine workflows and expand features
  • Update prompts, retrieval rules, metrics, and guardrails
โ€œโ€œ
A well-structured development process is the foundation of successful software projects. By combining clear planning, an agile approach, and continuous early feedback from the Client, we ensure that every product we build perfectly aligns with business goals. Our approach minimizes risks, optimizes resources, and delivers high-quality applications on time and within budget.
Irina BaryshnayaIrina BaryshnayaUnit Coordinator / Head of PM

Our recent works

Real Estate Platform
Real Estate Platform

Real estate platform maintenance and enhancement

A 5-year enhancement of a franchise property platform that brought ~30% more property enquiries through a website redesign and CoreLogic data integration โ€“ without rebuilding the platform from the ground up.

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  • Enterprise
Dexai Robotics
Dexai Robotics

Graphical user interface for robot operation

A GUI that freed Dexai Robotics' restaurant staff from engineer dependency โ€“ cutting robot setup time per shift by ~65% and reducing interaction errors by ~50% through real-time visual state monitoring and offline operation.

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  • IoT
  • Startups
Toyota ERP/CRM
Toyota ERP/CRM

Toyota custom ERP/CRM system

A custom ERP/CRM for Business Car Group โ€“ Russia's largest Toyota and Lexus dealer network โ€“ that replaced decade-old disjointed tools with a unified platform, cutting sales cycles by 30% across 20 dealer centers.

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  • Enterprise
AI Knowledge Base
AI Knowledge Base

AI-powered knowledge base for a global rights nonprofit

A Middle Eastern nonprofit working in cultural preservation needed a single searchable repository for fragmented research on ethnic minorities. We built a multilingual AI platform that now indexes 12,000+ artifacts across 18 countries.

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  • AI inside
  • Enterprise

Dave Alce

COO

From the early stages of the project, Nexterse LLC demonstrated a proactive attitude, actively seeking opportunities to enhance the solution and anticipate our needs. They consistently took the initiative to address any potential issues, provide timely updates, and offer solutions to challenges that arose during development. This proactiveness greatly contributed to the project's success and exceeded our expectations.

Alexander McCaig

Alexander McCaig

Co-Founder & CEO, Tartle

The system has produced a significant competitive advantage in the industry thanks to Nexterse LLC's well-thought opinions. They shouldered the burden of constantly updating a project management tool with a high level of detail and were committed to producing the best possible solution.

Andrey Kubka

Andrey Kubka

Product Technology Manager, Mediatron

Nectarin LLC aimed to develop a complex Ruby on Rails-based platform, which would be closely integrated with such systems as Google AdWords, Yandex Direct and Google Analytics.

Benjamin Dorsinvil

Benjamin Dorsinvil

Founder, SellBig

I was impressed by Nexterse LLC's prices, especially for the project I wanted to do and in comparison to the quotes I received from a lot of other companies. Also, their communication skills were great; it never felt like a long-distance project. It felt like Nexterse LLC was working next door because their project manager was always keeping me updated.

Damian Gevertz

Damian Gevertz

Founder & CEO, Widgety

We tried another company that one of our partners had used but they didn't work out. I feel that Nexterse LLC does a better investigation of what we're asking for. They tell us how they plan to do a task and ask if that works for us. We chose them because their method worked with us.

Domien Van Eynde

Domien Van Eynde

Team Lead, Daiokan.com

Nexterse LLC is the firm to work with if you want to keep up to high standards. The professional workflows they stick to result in exceptional quality. Importantly, they help you think with the business logic of your application and they don't blindly follow what you are saying. Which is super important. Overall, great skills, good communication, and happy with the results so far.

Katerina Bromberg

Katerina Bromberg

Co-Founder, MyMediAds.com

Together with the team, we have turned the MVP version of the service into a modern full-featured platform for online marketers. We are very satisfied with the work the Nexterse LLC team has performed, and we would like to highlight the high level of technical expertise, coherence and efficiency of communication and flexibility in work. We can confidently say that Nexterse LLC has put all our ideas into practice.

Maria Duyunova

Maria Duyunova

Director, Simplimagine LLC

We are absolutely convinced that cooperation between companies is only successful when based on effective teamwork. But the teams may vary on the degree of their cohesion.

Michael Karbushev

Michael Karbushev

Senior Director of Engineering, Evolv

They are very sharp and have a high-quality team. I expect quality from people, and they have the kind of team I can work with. They were upfront about everything that needed to be done. I appreciated that the cost of the project turned out to be smaller than what we expected because they made some very good suggestions. They are very pleasant to work with.

Paul S. Chun

Paul S. Chun

CTO, Rivalfox GmbH

Rivalfox had the pleasure to work with Nexterse LLC in building out core portions of our product, and the results really couldn't have been better. Nexterse LLC provided us with engineering expertise, enthusiasm and great people that were focused on creating quality features quickly.

Pratasevich Ivan

Chief Executive Officer, Ivanco-Media LLC

We'd like to thank Nexterse LLC for the exceptional technical services provided for our business. It should be noted that we started our project's development with another team, but the communication and the development process in general were not transparent and on schedule. It resulted in a low-quality final product.

Yevgeniy Rozenblat

Yevgeniy Rozenblat

Program Manager, TL Nika

Nexterse LLC succeeded in building a more manageable solution that is much easier to maintain.

Yuriy Semenchuk

Yuriy Semenchuk

General Director, Business Car

When looking for a strategic IT-partner for the development of a corporate ERP solution, we chose Nexterse LLC. The company proved itself a reliable provider of IT services.

Yury Haverman

Founder, BoxForward

Thanks to Nexterse LLC's can-do attitude, amazing work ethic, and willingness to tackle clients' problems as their own, they've become an integral part of our team. We've been truly impressed with their professionalism and performance and continue to work with the team on developing new applications. We are completely satisfied with the results of our cooperation and will be happy to recommend Nexterse LLC as a reliable and competent partner for development of web-based solutions.

Alex Phelps

Alex Phelps

CEO

We've been working with Nexterse LLC for a few years, starting from the initial monitoring system, so they already understood our environment quite well. At the same time, they still managed to surprise us with their professionalism.

Dillon Christensen

Dillon Christensen

CEO

We'd like to sincerely thank Nexterse LLC for the work they've done on our maintenance system. At one point, our maintenance efforts became inefficient โ€“ long downtimes and rising repair costs became the norm.

Erica Lindsay

Erica Lindsay

Manager

We had already invested in AI, but the output was unclear. There were multiple initiatives across the company, each showing some promise, but no clear way to evaluate them or connect them to business outcomes.

Paul Fardoe

Paul Fardoe

Director

Nexterse LLC is flexible, efficient, and extremely good at planning and being proactive. They have also been very proactive in their approach throughout the project, seeking to understand the needs and the reasons behind them before launching into development, which has been helpful for maintaining direction and consistency.

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Comprehensive multi-layer web security measures

Client security

Client security

  • Signing NDA and SLA from the start
  • Clear policies that secure your intellectual property
  • Secure authentication and access control for internal systems
Data security

Data security

  • Adherence to GDPR, HIPAA, SOC 2, ISO 27001
  • AES-256 encryption at rest and TLS 1.2+ in transit
  • Zero trust security model
  • Automatic data backups and disaster recovery
Application security

Application security

  • Automated continuous scanning for vulnerabilities
  • Real-time DDoS & bot protection
  • Compliance with OWASP's Top 10 guidelines
  • Regular security patches and updates
Network security

Network security

  • Firewalls & intrusion detection systems (IDS)
  • Network segmentation for breach isolation
  • Encrypted tunnels for secure remote access
  • OAuth 2.0, JWT tokens, and API gateways
DevSecOps

DevSecOps

  • Automated security checks in CI/CD pipelines
  • Best security practices and regular code reviews
  • Safeguarding containerized apps against misconfigurations
  • Logging & real-time security monitoring

Core tech stack we use

Backend development
Java.NETNode.jsPythonPostgreSQLMongoDB
Frontend development
ReactAngularVue.jsNext.jsTypeScriptReduxGraphQL
AI development
LangChainLlamaIndexOpenAIHuggingFacePyTorch
Web architecture for AI-powered solutions

Web development engagement models

Depending on your business needs, project scope, and team structure, we offer three flexible cooperation models for our custom web application development services.

Engagement models

Outsourcing

This is a classic approach in which we take complete responsibility for the entire development process. Our project management team organizes the work for our designers, developers, QA specialists, and other team members. You act as a stakeholder who focuses on strategic goals, communicating with our business analysts on project and business requirements and with our project managers on the project status.

Industry-specific web development

We specialize in developing multi-integrated, easily customizable, and fully controllable custom web software. Where the use case supports it, we add AI for search, classification, and forecasting.

Our web development approach

We run custom web application development through a structured process that covers scope, team setup, cost control, and post-launch support. When AI is part of the product, we extend SDLC with ADLC, so use case design, data preparation, evaluation, and rollout are handled inside the same process.

Project scoping

We define product goals, business requirements, AI scope, and delivery boundaries before development starts.

  • Run stakeholder interviews and workshops
  • Document user flows, business rules, integration points, and success metrics
  • Define where AI fits in the product and where deterministic logic should stay in control
  • Prepare a roadmap with milestones, release scope, dependencies, and priorities

Awards& Recognitions

Clutch 2026 โ€” Top Python and Django Developers in Boston
GoodFirms โ€” Top Software Development Company
Clutch 2026 โ€” Top Artificial Intelligence Company in Boston
techreviewer.co 2026 โ€” Top Software Development Companies
GoodFirms โ€” Top AI Development Company
Clutch 2026 โ€” Top .NET Developers in Boston
techreviewer.co 2026 โ€” Top AI Integration Companies
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Responsive Design Development 2025
Mobile Software Development 2025
IoT Services 2025

Frequently asked questions

Most teams can build a web interface and connect it to an API. The harder part is designing the backend, data flow, permissions, monitoring, and rollout model so AI features strengthen the product. We handle the web platform and the AI layer together.

Let's start

What's next
1. Tell us your vision
2. Expert discovery session
3. Receive your custom roadmap
4. Launch your project
If you have any questions, email us info@nexterse.com

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Account manager
Alex Morgan
Account Manager
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