Custom Software Development

Custom software: designed, built, and scaled with you

If you have the idea but not the team to ship it, or you need to move faster than hiring allows, that's where we come in — to a high standard and on time. LangOptima delivers software with our engineering partner, Instea: a team that has shipped 75+ products since 2013 for startups, scaleups, and companies with their own IT teams across Europe and the US.

We start from your business goals, not a feature list. We find the pain points, recommend the solution, platform, and architecture that fit, and build with modern technology, increasingly with AI at the core. Our work doesn't end at delivery: we maintain, support, and keep improving what we build.

What we do

AI integrations and automation

Put AI to work inside your product and your operations, from automating manual workflows to embedding models that make your software smarter. We add AI where it creates real value, not for the sake of it.

Discovery and AI adoption

A structured discovery phase that maps where you are, where you want to go, and where AI fits: solution, platform, and architecture decided before a line of code.

Team extension and custom development

Pre-vetted developers, architects, UX designers, QA engineers, and business analysts, matched to your stack and the way you work. A full build or a few senior pairs of hands: everyone is backed by the wider team, so no one gets stuck.

Legacy modernization

Modernize the systems slowing you down, without a risky big-bang rewrite. Aging platforms brought to a modern, maintainable, AI-ready standard, step by step.

MVPs and product scaling

From a first minimum viable product (MVP) to a full-scale product, built to grow. We ship a working version fast, then scale it as the product and the user base grow.

Proven with real products

Firefish — a Bitcoin lending marketplace used across 69 countries, with the MVP delivered in 2.5 months.

Scheidt & Bachmann — a legacy fare-collection platform re-architected into real-time microservices that compute fares and flag fraud in under 100 milliseconds, across cities in the US and the EU. Read the case study →

QUICK — a customer self-service logistics dashboard on a legacy backend: a 40x data-handling gain and 93% dispatcher satisfaction across multiple US locations. Read the case study →

Binarystar Systems (US) — complex, abstract concepts turned into working, scalable code, quickly and accurately.

Instea leads with certified project managers and a commitment to timeline, scope, and budget: a lead developer and project manager live within five days, a full team within four weeks. Scheidt & Bachmann's head of IT called the team "our SWAT team." See more in our case studies →

Modern stack, proven methods

Specialists in React, Node.js, Kotlin, and AWS, plus Claude for AI-native builds, balancing the newest technology with proven methods. Technology should serve the people who use it.

How we work

1) Understand

Where you are and where you want to go: solution, technology, platform, architecture. We align with your plans.

2) Build your vision

We build with care and direct, agile communication.

3) Verify

Quality, compliance, and deadlines, proven through testing.

4) Long-term partnership

We look after what comes next through active account management.

Who this tends to fit

Teams planning to speed up delivery, scaling a product or team, modernizing existing systems, or building a new digital product.

Bring us your idea. We'll bring it to life.