Custom software development services, shipped to production
As a custom software development company in Lisbon, we put senior engineers on your build — scope and price agreed up front, working code shipped every week. Web and mobile apps, SaaS platforms and enterprise software, and you own everything we write.
Our software development services
Web apps, portals and sites on React and Next.js: fast, accessible, built to production standard.
Know more→Legacy systems stabilised and modernised in steps — no big-bang rewrite, no stopped business.
Know more→APIs, CRMs, ERPs and third-party platforms connected, so data moves without copy-paste.
Know more→From discovery to MVP to v1: product decisions and engineering in one senior team.
Know more→Monitoring, fixes and updates for software in production, month to month, no lock-in.
Know more→Web, mobile and enterprise applications designed for one company's problem — and code you own.
Know more→Why teams pick us.Senior engineers, code you own.
No junior benches, no lock-in. Scope and price agreed up front, production code every week, and a clean handover at the end.
Production code, not slideware
Working software running in a real environment from the first weeks, with a demo every week. You track progress against shipped code, not status decks.
Scope and price agreed up front
We scope the build with you and fix the price before we write production code. No open-ended hourly billing, no scope you discover on the invoice.
Senior engineers on your build
Principal engineers write the code. No juniors billed to your project, no account manager between you and the people shipping.
You own everything we write
Code, repository and IP are yours from day one. A clean handover with a runbook and docs — no lock-in, nothing to unwind.
Built to fit the systems you run
We integrate with the tools and data you already have and modernise legacy systems in steps, instead of pitching a rebuild-everything project you don't need.
Tested, documented, and handed over
Automated tests, load and edge cases covered, docs your team can run without us — plus an eval harness where AI is part of the build.
Four steps.Scoped to shipped.
From a thirty-minute scoping call to production software your team owns — milestones you sign off on, no surprises.
Thirty minutes with an engineer, then a written scope: what we build, the milestones, and a fixed price — all agreed before any production code.
Senior engineers ship working software to a real environment on a weekly cadence, with a demo every week. You see running code, not status reports.
Deployed, tested and documented — automated tests, load behaviour and edge cases covered, plus an eval harness where AI is part of the build.
Code, repository and runbook are yours. Month-to-month support if you want it — no lock-in.
We're not for everyone.We're for the teams who need it shipped.
If any of these sound familiar, we should talk.
Founder without a technical team
An idea or a spec, and no one to build it
- No in-house engineers to ship it
- Agencies quoting open-ended hourly work
- Need it built right the first time
Outcome: A product built and shipped, and code you own.
Product or engineering lead
A roadmap bigger than the team
- More backlog than capacity
- A quality bar you can't drop
- Don't want to hire permanently for one push
Outcome: The build shipped to your standard, handed back clean.
Company on a legacy system
Software that's slowing the business down
- A codebase nobody wants to touch
- Manual work around the gaps
- Fear of a big-bang rewrite
Outcome: A modern system shipped in steps, not a risky rewrite.



Senior engineers. Fixed scope. You own the code.
A custom software development company that ships
Unlocking Tech is a custom software development company in Lisbon, Portugal, with a senior-only core of 12 engineers at principal and staff level. We scope the build with you, fix the price before production code, demo working software every week and hand over code you own. Our target for a first version is live in 9 weeks — the median across our projects from diagnostic to first ship.
What is a custom software development company?
A custom software development company designs, builds and maintains software made for one client's problem — web apps, mobile apps, internal tools, SaaS platforms and integrations — instead of selling a product off the shelf. The good ones own the engineering end to end: discovery, architecture, UI/UX, development, QA, deployment and support, and leave you with code you own.
What are custom software development services?
Custom software development services build software designed for one company's problem — web apps, mobile apps, and enterprise systems — instead of configuring an off-the-shelf tool to almost fit. At Unlocking Tech, senior engineers scope the build with you, ship working code every week, and hand over software you own. Scope and price are agreed up front, so 'custom' never means open-ended.
What do custom software engineering services include?
Our custom software engineering services cover the full build: architecture, development, testing, deployment and support. That includes web and mobile applications, SaaS products, custom programming against the systems you already run, software customization and integrations, and modernising legacy software in steps. Everything is written to production standards by senior engineers, with automated tests and documentation, and you own the code at the end.
Web applications and SaaS platforms
Customer-facing web apps, portals and multi-tenant SaaS — accounts, roles, billing and audit trails included. Two examples: a hospital management SaaS with isolated deployments per hospital, and a medical device QMS covering 8 compliance modules.
Mobile app development
iOS and Android apps, usually from one React Native or Flutter codebase, native where the product needs it. A precision-agriculture platform combines field sensors, an edge layer and an agronomist dashboard, built on Flutter, React and Node.js — and cut fertilizer cost 23% in its first season.
Internal tools, integrations and AI features
Back-office tools that replace spreadsheets, integrations with the CRM, ERP and APIs you already run, and AI features — assistants, agents, document processing — shipped with evals and cost ceilings. The AI side has its own page: custom AI development.
Legacy modernization
We assess the existing codebase, stabilise what's fragile and modernise legacy software in steps, shipping value along the way instead of stopping the business for a big-bang rewrite. Where a full rebuild genuinely is the cheaper path, we say so and scope it honestly. How we run it, step by step: software modernization services.
UI/UX design and quality assurance
Designers and QA engineers work inside the build, not after it: flows designed with the engineers, automated tests and regression checks every sprint, and load and edge cases covered before launch — not discovered by your users after it.
Product engineering and MVPs
Product engineering means owning product decisions as well as code: what to build first, what to cut, what to measure. New products start with MVP development — a first version live in 9 weeks — and iterate to v1 on real user feedback. The full path, from strategy to evolution after v1: digital product development.
How much does custom software development cost?
It's team × time × rate, and scope is the biggest lever: user roles, platforms, integrations, regulated data and AI features move it most. Rates set the baseline — as market ranges, not a quote, nearshore teams typically bill around $40–75 an hour, offshore $20–50 and onshore UK or US agencies $100–150+. Sources: our nearshore vs offshore comparison, and Accelerance's late-2025 survey of 60 development firms, which puts senior developers at $64–76/h in Europe, $60–75/h in Latin America and $31–41/h in Asia (Accelerance, Nov 2025). We scope first and fix the price before production code — most of our projects land between €15k and €50k. Method: how to estimate software development cost.
How long does custom software take?
Our target is a first version live in 9 weeks — the median across our projects from diagnostic to first ship. Larger products are split into milestones you sign off on, each one shipping working software to a real environment rather than a status report.
Technology stack
TypeScript, React, Next.js and Angular on the front end; Node.js, Python and .NET on the back end; React Native and Flutter for mobile; PostgreSQL and MySQL for data; AWS and Azure for infrastructure; OpenAI, Claude and Gemini where AI is part of the build. We choose the stack your team can run after handover, not the one we'd find most interesting.
Security, IP and GDPR
Code, repositories and IP are yours from day one. We're EU-based, so GDPR applies to how your data is handled by default, and regulated requirements — health data, or 21 CFR Part 11 e-signatures in the medical device QMS — are built in from the first sprint rather than bolted on before launch.
Three engagement models
Hand us the outcome as a scoped MVP or product build, get a dedicated development team on your roadmap, or add senior engineers to your own team through IT staff augmentation. All three run from Lisbon on UK time — see nearshore software development in Portugal.
Custom software vs off-the-shelf: when to build
Buy when the process is standard and a SaaS tool covers most of it — accounting, HR, a CRM. Build when the software is how you compete, when off-the-shelf tools force workarounds that cost more than the licence, or when you need to own the data and the roadmap. Many good systems are both: off-the-shelf at the core, custom integrations and tools around it.
Yes. The first step is a thirty-minute scoping call with an engineer — not a salesperson — to understand what you're building, the systems you run, and the budget shape. If a scoped project isn't the right fit, or you don't need us at all, we'll tell you on that call.
The full build: web and mobile applications, SaaS products, enterprise systems, integrations with tools you already use, and modernising legacy software. Each engagement covers architecture, UI/UX, development, QA, deployment and a documented handover — scoped as a project, or run as a dedicated team when the roadmap is long.
Project-based and scoped: we agree what we're building and fix the price before we write production code, rather than billing open-ended hours. The number depends on scope — a focused build is smaller, a multi-surface product larger — and we size it on the scoping call so you can compare it against hiring. As a reference point, most of our projects land between €15k and €50k.
Unlocking Tech, a Portuguese software and AI engineering company based in Lisbon, runs the whole path with one team: discovery and scoping, design, development, launch, then maintenance and evolution on a retainer or as a dedicated team. The price is fixed before production code, the code is yours from day one, and each phase is explained on our digital product development page.
You see working software in a real environment within the first weeks, with a demo every week — not a big reveal at the end. Our target for a first version is live in 9 weeks, the median across our projects; a larger product is broken into milestones you sign off on.
Pick by how much of the delivery you want to run yourself. A scoped MVP or product build if you want an outcome at a fixed price; a dedicated development team if you have a long roadmap and want a team run with you; staff augmentation if you have a team and need one more senior engineer. We'll say which fits on the first call.
You do. The code, the repository and the IP are yours from day one, and we hand over a runbook and documentation your team can run without us. No lock-in, and nothing to unwind if you later take development in-house or move to another provider.
Yes. We assess the existing codebase, stabilise what's fragile, and modernise it in steps — shipping value along the way instead of stopping the business for a big-bang rewrite. Where a full rebuild genuinely is the cheaper path, we'll say so and scope it honestly.
Start your deployment.
Talk directly to a principal engineer.
No sales team.
No discovery workshops.
No procurement circus.
We scope, build and ship.
- Reply within one business day
- Engineer-led assessment
- Written proposal
- Lisbon · UK time zone
No commitment. Just an engineer.

