Programming languages sound like a technical topic for programmers. For a business owner, however, they represent strategic decisions with long-term consequences — supplier selection, vendor lock-in, future modification costs, scalability, and security.
This article gives a business owner the foundation to ask the right questions at any IT investment — without needing to code. For broader IT context, see the pillar IT Basics for Business Owners.
What Is a Programming Language
A programming language is a formal language in which a computer programme is written. There are hundreds of them, but in business practice 2026, 8–10 languages cover 95% of all business applications.
A programming language consists of:
- Syntax — rules for writing (keywords, structure)
- Semantics — meaning of the writing
- Libraries — pre-built functions for common tasks
- Framework — structure for building applications (e.g. React for JavaScript, Django for Python)
- Toolchain — compilers, debuggers, package managers
Language + framework + database + cloud = the technology stack of a company or product.
Mainstream Languages for Business Software in 2026
JavaScript / TypeScript
The most widely used language in the world. TypeScript is an extension of JavaScript with static types.
Use cases:
- Web frontend (React, Vue, Angular, Astro)
- Backend (Node.js, Deno, Bun)
- Desktop applications (Electron — Slack, VS Code, Discord)
- Mobile (React Native)
Developer availability in the EU: Very high. Junior and senior talent available.
For a business owner: Safe choice. Modulario runs on TypeScript (NestJS).
Python
A versatile language, dominant in data analysis, AI/ML, automation, and backend.
Use cases:
- Backend (Django, Flask, FastAPI)
- Data science and AI (Pandas, NumPy, TensorFlow, PyTorch)
- Automation scripts
- DevOps tooling
Availability: High. The most used language in the AI/ML segment.
For a business owner: Safe choice, especially for data and AI projects.
Java
A classic of the enterprise world. Runs banks, large corporations, and telecom systems.
Use cases:
- Large enterprise systems
- Backend for high load
- Android applications (partially, being replaced by Kotlin)
Availability: High, but the average age of seniors is increasing.
For a business owner: Safe, but “enterprise” pricing. For SMBs, often overkill — suitable for regulated sectors (banking, insurance).
C# / .NET
The Microsoft ecosystem — developed by Microsoft but now open-source and cross-platform.
Use cases:
- Business software in the Microsoft ecosystem
- Web (ASP.NET Core)
- Desktop (.NET MAUI)
- Game development (Unity)
Availability: High, especially in the EU.
For a business owner: Safe for Microsoft-centric companies. Strong UK, German, and broader EU talent pool.
PHP
Old, but still widely used for web.
Use cases:
- WordPress (60% of all websites)
- E-commerce (WooCommerce, Magento)
- Legacy business applications
- Laravel, Symfony frameworks for modern projects
Availability: High, but declining prestige in the senior segment.
For a business owner: Safe for web and e-commerce; for new projects, prefer more modern alternatives.
Go
A younger language from Google, dominant in cloud-native, microservices, and DevOps.
Use cases:
- Cloud infrastructure (Kubernetes, Docker, Terraform are written in Go)
- Backend microservices
- CLI tools
Availability: Medium, but growing.
For a business owner: Good for specific use cases. For standard business software, often over-engineered.
Rust
Performance-critical code, alternative to C++.
Use cases:
- Systems software
- Embedded
- Performance-critical parts (databases, compilers)
Availability: Low, but growing.
For a business owner: Not needed for 99% of SMB use cases. If a vendor proposes Rust for standard business software, ask why.
Exotic Languages: Red Flag for SMBs
In 2026, bespoke development offers occasionally appear in exotic languages:
- Erlang / Elixir — excellent for real-time systems, but narrow community
- Clojure — functional Lisp, intellectually elegant, but few developers
- F# — functional .NET, practically non-existent in most EU talent markets
- Haskell — academic choice, almost no commercial market
For an SMB, this means:
- Vendor lock-in — nobody else will understand the code
- If the developer leaves, a major problem arises
- During acquisition or due diligence, this creates complications
If a vendor proposes an exotic language, ask: why? What does your company gain from this?
How to Ask the Right Questions of Suppliers
In bespoke development or SaaS selection:
1. What Is the Primary Language and Framework?
The answer should be specific (“Python with Django framework”, “TypeScript with NestJS”). Vague answers (“we use modern technologies”) are a red flag.
2. What Is Developer Availability in the EU?
For mainstream languages (JS, Python, Java, C#, PHP), this is fine. For exotic choices, ask for specific numbers — how many people in the EU know this?
3. Who Owns the Source Code?
In bespoke development — always the client. No excuses. Code escrow as insurance.
4. What Are the Dependencies?
Open-source components with active communities are fine. “Custom proprietary library from a single author” = vendor lock-in.
5. What Is the Documentation?
Without documentation, the code is a black box. Request:
- Architecture diagram
- API documentation
- Setup / deployment manual
- Onboarding guide for a new developer
6. What Is the Team?
A junior-only team = higher risk of poor-quality code. At least one senior with 5+ years in the language/framework.
7. What Happens When a Developer Leaves?
Bus factor 1 (one person knows the entire codebase) is dangerous. Require a minimum of 2 people familiar with the project.
Modulario Technology Stack
Modulario is transparent about its technology — this reduces perceived vendor lock-in:
- Backend: NestJS (TypeScript) — mainstream, available developers across the EU
- Frontend: Astro (static sites) + Preact / React components
- Database: PostgreSQL — open-source, the most popular relational DB in the EU
- Infrastructure: Kubernetes (Kamal), CI/CD via GitHub Actions
- Hosting: EU data centres (Frankfurt, Prague)
- Authentication: Better Auth, OpenFGA for permissions
- Components: shadcn/ui (Radix + Tailwind), dhtmlx for Kanban/Gantt/Calendar
Clients purchase SaaS, but standard technologies mean that any migration or audit is technically feasible. No proprietary “secret sauce” technologies unique to one vendor.
Vendor Lock-in: How to Avoid It
Vendor lock-in is not only about the language, but about the overall architecture:
- Standard protocols (REST, GraphQL) instead of proprietary ones
- Open data formats (JSON, XML) instead of custom binary formats
- Export functionality — ability to extract data in a structured format
- API access — external systems can communicate with your data
- Open standards instead of custom (OAuth, SAML, OpenID Connect, OpenAPI)
Modulario provides full API access, standard formats (CSV, JSON exports), and SAML 2.0 / OIDC for SSO. Migration from Modulario (if it were to happen) is technically feasible.
Frequently Asked Questions
What programming languages exist and which is best? In 2026, the dominant languages in a business environment are: JavaScript/TypeScript (web), Python (backend, AI, data), Java (large enterprise systems), C#/.NET (Microsoft ecosystem), PHP (web, e-commerce), Go (cloud-native). None is universally ‘best’ — the choice depends on the type of project, developer availability, and integration with existing infrastructure. For EU SMBs, JavaScript, Python, Java, and C# are the safest choices in terms of talent availability.
Should I ask my software vendor what language they develop in? Yes, always. Reasons: (1) developer availability in the EU affects the cost of future modifications, (2) exotic languages mean vendor lock-in — nobody else can fix the code, (3) some languages have better security track records, (4) integration with existing infrastructure. Questions to ask: what is the primary language, what framework, who owns the source code, what is the development team structure.
What is a technology stack and why does it matter? A technology stack is the combination of language, framework, database, and infrastructure. Example: Modulario runs on NestJS (Node.js/TypeScript backend) + PostgreSQL + EU cloud. The stack determines future costs, performance, scalability, and vendor lock-in. A mainstream stack always has alternative suppliers. An exotic stack is a risk.