Custom Systems & Web Applications
For unique business challenges, off-the-shelf software isn't enough. We architect and build secure, scalable systems on Angular / Next.js / React with Node.js (Express) and MongoDB or PostgreSQL. From CRM, CMS and warehouse systems to SaaS platforms — with the integrations that matter in Poland (KSeF, ERP, payments). You keep full IP ownership and a system built to scale from MVP to enterprise without technical debt.
OverviewService Overview: Bespoke Software Engineering
Off-the-shelf software (SaaS) is great for standard problems, but unique businesses require unique solutions. At OKSoftware, we specialize in building Custom Web Applications that serve as the proprietary engine of your company. Whether you are a startup building an MVP to raise capital, or an established enterprise needing a dedicated customer portal, we deliver "Surgical Precision" in code.
We don't just "write scripts." We architect systems. By leveraging a modern, type-safe stack (Next.js, Angular, Node.js), we ensure your application is stable, secure, and ready to handle millions of requests. Most importantly, unlike renting a SaaS, you own the code, making it a valuable asset on your balance sheet.
What's includedWhat's Included in Custom Engineering:
Scalable Backend Architecture
The brain of your application. We build robust APIs and microservices that handle your business logic without failing.
- Node.js & Express: We build high-performance, event-driven backends capable of handling real-time data and heavy traffic loads.
- Database Integrity (PostgreSQL): For critical business data (financials, user accounts), we use relational databases with strict ACID compliance to ensure data never gets corrupted.
- MongoDB: For flexible data structures like logs or rapidly changing content schemas.
Interactive Frontend (React, Next.js, Angular)
We build interfaces that feel like native apps, choosing the right framework for your scale.
- React & Next.js (For SaaS & Startups): The industry standard for high-performance dashboards and public-facing apps. We use Next.js for server-side rendering (SSR), ensuring your app is fast and SEO-friendly.
- Angular (For Enterprise): When stability and strict structure are paramount. We deploy Angular for massive, data-heavy corporate portals and internal banking-grade systems where standardization is key.
- Type Safety: We use TypeScript across all frameworks to catch errors before they reach production, drastically reducing bugs and maintenance costs.
Cloud Infrastructure & DevOps
A great app needs a great home. We set up your infrastructure to be secure and auto-scalable.
- Docker & Containerization: We wrap your application in containers, ensuring it runs identically on every server, eliminating "it works on my machine" issues.
- CI/CD Pipelines: Automated testing and deployment. When we push code, it's automatically tested and deployed, allowing for rapid feature updates.
- Scalable Hosting: Architecture ready for AWS, DigitalOcean, or Google Cloud.
Security & IP Ownership
We take security as seriously as a bank.
- Full IP Ownership: You own every line of code. No vendor lock-in. You can take the codebase to your internal team at any time.
- Data Protection: Implementation of encryption at rest and in transit, ensuring GDPR compliance.
- Role-Based Access Control (RBAC): Granular permission systems ensuring users only see what they are supposed to see.
IntegrationsIntegrations that matter
Your system doesn't live in a vacuum. We connect it to what you already use — with a focus on what's actually required in Poland.
KSeF & invoicing
Structured e-invoices straight from your system — ready for the mandatory KSeF.
- KSeF: Issue and receive structured invoices directly from the app.
- Invoicing: Automated documents, numbering and archiving.
Payments & billing
Online payments, subscriptions and settlements — the gateways your customers expect.
- Gateways: Stripe, Przelewy24, PayU, BLIK — one-off and recurring.
- Subscriptions: Recurring billing, plans and multi-currency.
ERP, accounting & logistics
One consistent flow across the tools you run your business on.
- ERP & accounting: Sync documents, contractors and stock — no double entry.
- Couriers & shipping: Labels, tracking and shipment automation.
APIs, data & automation
Two-way integrations with anything that speaks an API — plus clean migrations.
- REST APIs & webhooks: Real-time, two-way data exchange.
- Legacy & migrations: Connect to or move off older systems safely.
Tech stackOur Engineering Stack
We use a "Boring but Proven" stack. We avoid experimental hype in favor of stability and long-term support.
Frontend Frameworks
- React.js: The most popular library for building dynamic user interfaces. Perfect for agile startups and interactive products.
- Next.js: The production framework for React. Essential for performance, SEO, and scalability.
- Angular: Google's framework for enterprise-scale applications. Our choice for strict, large-scale corporate environments.
Backend & Data
- Node.js: Fast, scalable network applications. Perfect for real-time services and APIs.
- PostgreSQL: The world's most advanced open-source relational database. Our default choice for data integrity.
- TypeScript: A superset of JavaScript that adds static types. It is our insurance policy against bugs in large codebases.