Own products in productionSoftware & AI engineering

Custom software, with AI that survives production.

We design and build web applications, APIs and products — for companies and for consumers — including the language-model features, retrieval and agents inside them. And when AI is the wrong answer, we say so before you pay for it.

Light-filled modern office with workstations and tall windows

What we build ourselves.

  • 03Own products in production
  • HaljasVaadeGarden design from a photo, iOS and Android
  • HindaAIProperty snapshot for an Estonian address
  • CmdBriefNative macOS workspace for coding agents

Why JLDev

Most AI features die somewhere between the demo and the second week of real users. We build the unglamorous parts — evaluation, fallbacks, cost ceilings, observability — so yours does not.

We ship the AI part

Evaluation, fallbacks and cost control designed in from the first sprint — not bolted on after the demo lands.

Model-agnostic by default

Built so you can change model or vendor without rewriting the product that was wrapped around it.

One team, architecture to production

The engineers who design your system are the ones who operate it. No account layer, no handoff.

Technology

Boring infrastructure, chosen on purpose.

Type-safe where it matters and deliberately unexciting everywhere else. We pick tools your team can still hire for in 2032 — and we do not build your product around one vendor’s API.

  • TypeScript
  • Python
  • Rust
  • Go
  • React 19
  • pgvector
  • PostgreSQL
  • Kubernetes
  • Terraform
FAQ

Answered before you ask.

Marked up as FAQ structured data, so these answers can surface directly in search results.

We start from the workflow, not the model. If a deterministic system solves the problem more cheaply and more reliably, we will say so and build that instead — the assessment is the same price either way.

Contact

Tell us what you are trying to build.

Two sentences about the product and the constraint is enough to start. We reply within one working day — with a plan, or an honest referral if it is not our work.

info [at] jldev.euEstonia · European Union

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