We build websites, mobile apps, and the systems behind them for companies who want a partner that shows up prepared and stays for the long run.
PT Ventaris Prima Causa is a software house based in Jakarta, Indonesia.
About us
A standard decided before the first decision is made. Ours is people. Not people in the abstract, but each individual, irreplaceable and unrepeatable.
Ventaris comes from the Latin ventus, wind. Wind fills sails, carries seeds to new soil, clears the air. It doesn't create the destination, it makes the journey possible.
Prima Causa is Aristotle's term for the first cause, the reason behind every reason, the foundation beneath all foundations.
We believe every company has a first cause, a standard decided before the first decision is made. We named ours before we built anything: our Prima Causa is people.
People is where every decision begins and ends, and it means three things to us, held with equal weight.
People who use what we build
We solve real problems and create real joy, and we don't draw a line between the two. Both are ways of saying we thought about you when we made this.
People who work with us
Clients deserve a partner who shows up prepared, communicates honestly, and delivers with care. Every engagement is a long-term relationship, because trust is built over time.
People on our team
Indonesia produces some of the world's most gifted engineers and builders. They deserve meaningful work, fair reward, and the chance to build something great without leaving the people they love.
Every line of code, every product, every client, every teammate: does this improve someone's life?
We ask the same question every time, and we hold ourselves to the answer without exception. Prima Causa. The first cause. The reason before all other reasons. Ours is people.
Vision
To be the partner that proves world-class software can be built in Indonesia, measured not by what we ship, but by the lives it improves.
Mission
Services
Four practices that work together, so the product you launch, the systems behind it, the plan that shapes it, and the engineers who build it can all come from one team.
Company profiles, storefronts, and web platforms built to load fast, rank well, and stay easy to update after we hand them over.
Mobile products for Android and iOS, from a first release that proves the idea to the internal tools your operations actually run on.
For when the question is bigger than one product: what to build, what to buy, what to retire, and in which order.
For when you need engineering capacity inside your own project rather than a finished product. We assign our engineers to work alongside your team for an agreed period.
SES engagements run differently from project work. See how an SES engagement works.
Service flow
Six stages, each ending with something you can hold: a document, a demo, a release. You always know where the project stands and what comes next.
We listen before we propose anything. You tell us the problem, who it affects, and what success looks like. If we're not the right team for it, we'll say so here.
You leave withProblem brief, scope direction, and an indicative budget and timeline. No cost, no obligation.
We turn the brief into a plan: what gets built, how it fits your existing systems, which technology it runs on, and what it costs. Nothing is left as "we'll figure it out later".
You leave withFeature list, user flow and wireframes, system architecture, tech stack, and a firm proposal.
We put the plan in writing so both sides are protected: scope, milestones, payment terms, and who is responsible for what. Then we kick off with the people who'll do the work in the room.
You leave withSigned contract and scope of work, milestone and payment schedule, NDA, and a named project contact.
We build in short sprints and show you working software at the end of each one, not status reports. Quality assurance runs alongside development, and you test it yourself before anyone calls it done.
You leave withSprint demos, a staging environment you can open anytime, QA reports, and user acceptance testing.
We take it live. Servers configured, data migrated, store submissions handled. Your team is trained before launch day, not after it.
You leave withProduction release, store approval, documentation, team training, and full handover of source code and credentials.
Launch is the middle of the project, not the end. We stay on for warranty and monitoring, then keep improving the product as you learn what your users actually do with it.
You leave withWarranty period, agreed response times, monitoring and backups, and a roadmap for the next release.
Every project is different. Small, well-defined work can move from consultation to agreement in a week; a platform replacement takes longer and deserves to. We'll tell you which one yours is at stage one.
SES is a contract for our engineers' labour and expertise, not for a finished product delivered at the end. Work is delivered remotely from our team in Jakarta, and every task instruction runs through our own team lead. That keeps the arrangement a genuine service contract rather than disguised dispatch.
On-site placement is not offered at present. Our engineers work from Jakarta on our own equipment and accounts, and report through our lead.
Contact us
Email us and you'll hear back from someone who can actually answer technical questions, usually within one working day. The first conversation is free.
Tell us a little about the project. The more you can share about the problem and the timeline, the more useful our first reply will be.
Careers
Indonesia produces some of the world's most gifted engineers and builders. We think they deserve work worth doing, paid properly, close to home.
Every project passes the same test we hold ourselves to: does this improve someone's life? You will know who your work is for.
World-class work earns world-class pay. We discuss numbers openly at the first interview rather than at the end.
Great engineering and a life outside it are not a trade-off here. We plan projects so that crunch is the exception, not the method.
Websites, mobile apps, and systems consulting sit in one team, so you can go deep in a craft without doing the same ticket for three years.
Tell us who you are and what you build. If nothing below fits what you do, choose an open application and tell us anyway.