Custom software and product development
Custom software development for startups and corporates. We build, launch and grow your product in releases, with product management, design and engineering in the same place, for as long as you need us.
Why build with WeaveLines
Four places products come to us from. The work that follows is the same: releases, one after another.
Start a new product
From an idea to a launched first version in 2 to 6 weeks, then the releases after it. Most products start here.MVP developmentTake over a product another team started
A prototype, an MVP that shipped and stalled, or a codebase nobody wants to touch. We start with a short review of what exists, keep what holds up, and plan the shortest route to the next release.Grow past the MVP
Real users, real feedback, and a list of things the first version could not do. We turn that into a release plan and ship it, release by release, with the measurements to know what worked.Add AI or redesign the experience
AI features built into the product and measured before they ship, or a new interface prototyped in days and tested against the old one.AI development
Product, design and engineering together
Every release needs the three of them: someone deciding what to build and why, someone shaping how it works, and someone building it so it lasts. At WeaveLines they work in the same place, so decisions reach the product quickly.
Product management sets direction, scope and priorities. UX/UI design turns them into an interface people can use. Engineering builds it in the stack it will grow in, with testing, releases, infrastructure and monitoring as part of the work.

How a release cycle works
Six steps that repeat for as long as the product keeps changing.
01Plan
What goes into the next release and why, decided with you, written down and sized. AI helps draft the specs and the backlog; the priorities are yours.02Design
Changes are prototyped before they are built, so you can review the new flow before any code is written.03Build
Engineers build in the real stack with AI coding tools, and a second engineer reviews every change before it ships.04Review and test
Automated tests and CI run on every change, and you review working software regularly, with a demo at each step.05Release
To the web or the app stores, with monitoring and error tracking in place. On mobile, updates that do not need a store review go out over the air.06Measure
What changed for users after the release, and what that means for the next one. The plan for the next cycle starts here.
Engineering standards
The same rules on every project, whatever its size.
TypeScript everywhere
Front end, back end and mobile in one typed language, so a whole class of mistakes is caught before users see it and the next engineer can read the codebase.Review on every change
A second engineer reviews every change before it ships, including code written with AI assistance.Automated tests and CI
Tests run on every change in a pipeline that blocks what fails. Nothing reaches production by hand.Staged environments and safe deploys
Separate development, staging and production environments, and deployments that do not take the product down.Security as routine
Nothing waits for a security phase at the end: dependencies kept current, secrets kept out of the code, access on a need-to-have basis, and checks against the OWASP list on every project.Performance, measured
The screens and endpoints that matter get a target they have to meet, and we profile and test against it before a release rather than guess.Monitoring before launch
Error tracking and uptime monitoring in place before the first user arrives, with AI-assisted triage after.Documented and handed over
Decisions written down as they are made, instructions for running the product, and a clean handover if your own team takes over.
How you follow the build
Work runs in two-week sprints, and each one ends with a demo of working software. The backlog and the progress sit on a shared board you can open at any time, and the team is available to talk, review and decide throughout the sprint, not only at the demo.
Every change goes through review, automated tests and CI before it reaches staging, and nothing reaches production by hand. When something breaks after launch, monitoring tells us before your users do.
How we engage
Custom software development is usually time and materials billed monthly: a team on the product for as long as it needs one, with the scope adjusted release by release. The other shapes exist for a reason.
- Time and materials
- A team on the product, billed monthly by the effort spent, for work that is open-ended or changes often.
- Retainer
- Steady care for a product that needs fixes, improvements and the occasional feature rather than a full team.
- Fixed-price feature
- A scoped feature with an agreed price and an agreed launch date.
- Fractional CTO or CPO
- When a product needs a lead more than it needs more hands: technical or product direction, part-time, without a full-time hire.
What we build with
The stack is chosen for each product. These are the technologies we work with most.
- Web
- TypeScript and the React ecosystem, with the framework chosen per project.
- Mobile
- React Native with Expo, one codebase for iOS and Android.
- Backend
- Node.js; PostgreSQL first, with MongoDB, Neo4j or Redis when the data has a different shape.
- Cloud
- AWS first, Cloudflare where it fits, and a plain server when that is the right size, with Docker-based deployments, separate development, staging and production environments, and CI/CD on every change.
- AI features
- Claude, GPT, Gemini or open models, chosen per use case.
Cloud and DevOps
The product runs somewhere, and that somewhere is part of the work.
- Infrastructure
- AWS first, Cloudflare where it fits, and a plain server when that is the right size, set up in your own accounts.
- Deployments
- Docker-based deployments, separate development, staging and production environments, and CI/CD on every change. Nothing reaches production by hand.
- Monitoring
- Error tracking and uptime monitoring from the first release, with AI-assisted triage so the small problems stay small.
- Migrations
- When a product outgrows where it started, we move it to where it fits, one piece at a time, without stopping the business.
“The team have a quick turnaround time and work independently. They are flexible in dealing with challenges or requirement changes. Moreover, they have prompt and professional communication, and their breadth of expertise stands out.”
- MVPs launched
- 36
- Startups coached
- 150+
- Mentorship programs
- 12
- Founded
- 2017
Frequently asked questions
What is the difference between MVP development and custom software development?
An MVP is the first version: a fixed scope, a fixed price, live in 2 to 6 weeks. Custom software development is everything after that, or instead of it when a product already exists: releases planned and shipped one after another, for as long as the product needs a team. Most clients start with the first and continue with the second, and WeaveLines runs both with the same people.
Do you work with corporates as well as startups?
Yes. WeaveLines builds custom software for startups and for established companies: new products, internal tools, and the modernization of software that already runs the business. The process is the same, sized to the organization: discovery, a prototype before code, releases reviewed and tested before they ship.
Can you take over a product another team built?
Yes, and it is a common way to start. WeaveLines begins with a short review of the code, the infrastructure and the product itself, tells you plainly what holds up and what does not, and plans the shortest route to the next release. A rewrite is the last resort, not the first suggestion.
How often do you release?
As often as the product and your users can absorb. Every change goes through review, automated tests and CI, so releasing is routine, and on mobile the changes that do not need a store review go out over the air. WeaveLines agrees the rhythm with you and adjusts it release by release.
Who decides what gets built?
You do, with a product lead from WeaveLines making sure the decision is an informed one: what users are doing, what the last release changed, what each option costs. AI helps draft the specs and size the work; the priorities stay yours.
How do you keep quality up as the product grows?
The same way on every release: a second engineer reviews every change, automated tests and CI run before anything ships, and monitoring and error tracking tell us about problems before users do. WeaveLines builds in the stack the product will grow in, so growth does not mean a rewrite.
What technology do you use?
The TypeScript ecosystem end to end: React on the web, React Native with Expo on mobile, Node.js behind them, PostgreSQL first, with MongoDB, Neo4j or Redis when the data has a different shape, and AWS first, Cloudflare where it fits, and a plain server when that is the right size. For AI features, Claude, GPT, Gemini or open models, chosen per use case. WeaveLines chooses the stack for each product and builds in the one the product will grow in.
How is custom software development priced?
Usually time and materials billed monthly: a team on the product for as long as it needs one, with the scope adjusted release by release. A retainer fits products that need steady care rather than a full team, and a fixed price fits a scoped feature. When a product needs a lead more than it needs more hands, a WeaveLines lead takes the fractional CTO or CPO seat.
Do you handle infrastructure and DevOps?
Yes. WeaveLines sets up and runs the infrastructure the product needs: AWS first, Cloudflare where it fits, or a plain server when that is the right size, with Docker-based deployments, separate development, staging and production environments, CI/CD on every change, and monitoring and error tracking from the first release. When a product outgrows where it started, we migrate it.
Do you build AI features as part of product development?
Yes. AI features are built into the product like any other feature: prototyped against your real data, measured with an evaluation set before they ship, and monitored after. WeaveLines works with Claude, GPT, Gemini and open models, chosen per use case, and your data stays in your own accounts.
From the blog
AI-assisted development: what actually gets faster, and what does not
AI coding assistants make some engineering work dramatically faster and leave the rest exactly as slow. The numbers from studies and agencies, what we see on our own projects, and the practices that decide whether the speed is real.Read moreBuild or buy AI for your product: a decision guide
Most AI features come in three shapes: an off-the-shelf tool, a feature built on a foundation model, or a custom model. How to choose between them on value, data, cost over five years and the risk of being wrong.Read moreVibe coding: what it is genuinely good for, and why it does not survive real users
Vibe coding gets you a working demo in an afternoon, and that is real. It also produces code nobody has read, with security flaws in about half of it, and it breaks the moment real users arrive. Where the line is, with the evidence, and what to do instead.Read more
Everything we do
Custom software development is the whole of it. These are the parts.
MVP Development
A first version your customers can use, live in 2 to 6 weeks.Learn moreAI Development
AI features and AI products, built into what you ship.Learn moreProduct Design
Research, an interactive prototype in days, and the interface engineers build from.Learn moreWeb Development
Web applications, dashboards, APIs and integrations.Learn moreMobile Development
iOS and Android apps with React Native and Expo.Learn moreDesktop Development
Windows, macOS and Linux apps with Electron.Learn moreProduct Management
Direction, scope and priorities from a product lead or a fractional CPO.Learn more
Build and grow your product with WeaveLines
Tell us where the product is and where it needs to be. Thirty minutes is enough to know what the next release should be.
Get in touch with us
Reach out to us to explore limitless possibilities for your startup. Let’s collaborate and transform your ideas into success stories.
Our offices
- HeadquartersWeaveLines LLCrue Slah Eddine Bouchoucha2026 Sidi Bou SaidTunis, Tunisia
- Tunis OfficeWeaveLines LLC39 rue Ibn Khaldoun1002 Tunis, Tunisia
