Travel eSIM
merrsim.com
Prepaid travel eSIMs delivered as a QR code. Scan it, activate in minutes, and get 4G/5G data in 134+ countries at up to 90% less than roaming.
Tessera is a software studio. We design, build, and run web platforms, cloud infrastructure, and AI systems, then stay accountable for them in production.
Why Tessera
Most software fails quietly: missed deadlines, bloated scope, code nobody wants to touch. We run small senior teams, ship in two-week increments, and hold the line on quality until your product is live.
What we do
Web applications, SaaS platforms, and internal tools — architected properly, tested, and built to be maintained by whoever comes after us.
Deployment pipelines, container orchestration, and observability. Your product stays fast and stays up, without a full-time ops team.
LLM-powered features that survive contact with real users: retrieval pipelines, agents, evaluation harnesses, and cost control from day one.
Architecture reviews, hiring help, and rescue work on stalled projects. A senior engineering brain on your side of the table.
How we work
One to two weeks of focused digging: goals, users, constraints, existing systems. You get a written brief, a scope, and a number.
UX flows, system design, and a clickable prototype. You approve the blueprint before a single line of production code exists.
Two-week sprints with a demo at the end of every one. Working software over status reports. You watch the product grow.
Deploy, monitor, iterate. We treat go-live as the start of the job, not the end of it. Most of our work happens after launch.
Selected work
Travel eSIM
Prepaid travel eSIMs delivered as a QR code. Scan it, activate in minutes, and get 4G/5G data in 134+ countries at up to 90% less than roaming.
SMS Verification
Temporary phone numbers for SMS verification. Rent a real number in 149+ countries, catch the code in seconds, and get an automatic refund if it never arrives.
The studio
Tessera was founded on a simple observation: most software projects fail from too many hands and too little ownership. So we stayed small. Senior engineers only, no account-manager relay, no junior farm.
The people who scope your project are the people who build it. That is the whole org chart.
Prishtina, Kosovo — working worldwide
We demo every two weeks. Progress you can click beats progress you have to believe.
Proven tools for the foundation, new tech only where it buys you something measurable.
Every repo, credential, and document belongs to you from day one, in accounts you control.
Technologies we use: TypeScript, React, Astro, Node.js, Python, PostgreSQL, Redis, AWS, Cloudflare, Kubernetes, Terraform, GraphQL
Questions
Anything else? Write to hello@srv.al
Web applications, SaaS platforms, internal tools, e-commerce systems, and AI-powered products. From a 6-week MVP to a multi-year platform — if it runs in a browser or on a server, it is in scope.
Contact
Two sentences is enough to start. We reply to every serious inquiry within one business day.