Custom web applications, production APIs, SaaS products, and enterprise systems — engineered end-to-end by a team that writes clean, documented, maintainable code. We build the digital infrastructure your business runs on.
We work with the technologies that the best engineering teams in the world rely on — not what we were comfortable with five years ago.
From single-feature web apps to full enterprise platforms — we scope, architect, build, and deploy. Every project comes with documentation, tests, and code you can actually hand off.
Full-stack web applications built to spec — not adapted from templates. We design and develop applications that handle your specific business logic, user flows, and data models.
Whether it's an internal operations tool, a customer-facing platform, a marketplace, or a workflow automation system — we build the right architecture for the use case and scale requirements.
Clean, well-documented APIs that integrate with anything. We build APIs that follow best practices: proper versioning, authentication, rate limiting, error handling, and comprehensive OpenAPI documentation so any developer can integrate immediately.
This includes internal APIs that connect your systems, external APIs for third-party integrations, and webhook systems for event-driven architectures.
Building a SaaS product means far more than building a web app. It requires multi-tenancy architecture, subscription billing, usage metering, onboarding flows, feature flags, and infrastructure that scales cost-effectively from 10 to 10,000 users.
We've built SaaS products end-to-end. We know the patterns that work and the shortcuts that cause pain later. We build for long-term maintainability.
Most businesses run on 5–15 separate software systems that don't talk to each other. We build the integration layer: syncing CRM data to your data warehouse, connecting your e-commerce platform to your fulfilment system, automating data flows between tools your team actually uses.
This includes custom ETL pipelines, event-driven integration middleware, and real-time data synchronisation systems.
A poor database schema is technical debt that compounds — slow queries, complex migrations, data integrity issues. We design schemas that are correct from the start: properly normalised, well-indexed, and designed for the query patterns your application actually needs.
This includes greenfield database design, existing schema reviews and optimisation, and migration planning for legacy systems.
Your software is only as reliable as its infrastructure. We set up CI/CD pipelines that make deployments safe and fast, containerise applications for consistency across environments, and provision cloud infrastructure with proper monitoring, alerting, and security configurations.
Most companies choose: hire a software dev team, or hire an AI team. With N3XUS you get both — with direct integration between them. We don't bolt AI onto finished software as an afterthought. We architect AI capabilities into the system from day one, using the right models and integration patterns for each use case.
This means your web application can have genuine AI search, your API can call LLMs with properly managed context, and your SaaS product can have AI features that are actually reliable in production.
We understand your problem, your users, your data, and your constraints. Output: a detailed technical scoping document with architecture options, timeline, and a fixed-price quote.
Database schema, API design, component architecture, and UI wireframes agreed before a line of code is written. No expensive surprises mid-build.
Two-week sprints with working software at the end of every sprint. You see real progress, not slide decks. Feedback incorporated continuously, not saved for the end.
Production deployment with monitoring, documentation handoff, and a support period. We make sure your team can operate and extend the system independently.
Fixed-price projects with detailed scoping upfront. No surprise invoices. All prices in USD.
Ongoing maintenance retainers available from $750/mo. Monthly capacity blocks available for product teams needing continuous development.
Frontend: React, Next.js, TypeScript, Tailwind CSS. Backend: Node.js (Express), Python (FastAPI). Databases: PostgreSQL (primary), MongoDB, Redis. Infrastructure: Docker, AWS/GCP, GitHub Actions CI/CD. We choose the right tools for each project — but these are our defaults because they're proven, well-supported, and easy for your team to maintain and extend.
We maintain structured overlap with your business hours regardless of your time zone. Daily async updates via Slack, bi-weekly video calls for sprint reviews, and a project management board (Linear or Notion) you have full visibility into at all times. Most clients say the time difference is a net positive — you send feedback at end of day and wake up to completed work.
Yes — this is one of our core strengths. We integrate AI (LLM APIs, RAG systems, ML models) directly into custom software. Whether you want an AI-powered search in your web app, a content generation feature in your SaaS product, or a prediction engine in your dashboard — we handle both the software layer and the AI layer. No need to hire two separate teams. See our AI Development page for more details on AI capabilities.
Every project includes a support period (30–90 days depending on tier) where we fix any bugs and help your team understand the codebase. We provide full documentation, an architecture diagram, and a deployment runbook. After the support period, you can continue with a monthly retainer for ongoing development, or take the code fully in-house. The code is yours — clean, documented, and maintainable by any competent developer.
We start every project with a scoping engagement (1–3 days, often free for qualified projects). This produces a detailed technical specification, architecture design, and a fixed-price quote with a defined timeline. We quote fixed-price because it aligns our incentive with yours — we want to build it right the first time, not bill for every hour of rework. Scope changes after the contract are handled via a formal change request process with transparent impact on price and timeline.
Book a free discovery call. We'll listen to what you need, ask the right questions, and send you a detailed scoping document with architecture options and a fixed-price quote — no obligation.
