Backend developer and system architect, ELT and EdTech

Deniz Jamalzadeh

I build reliable, scalable infrastructure for English language training. My focus is clean architecture, secure multi-tenant systems, and software that stays dependable under real workload.

Open to connections in ELT, EdTech, and software

View work Get in touch

About

I lead development on ELTica, an end-to-end SaaS platform for CELTA, DELTA, TEFL, and related teacher-training programmes. It handles the full application lifecycle, from pre-application tasks and interview scheduling through to certificate issuance, for training centres and their trainees.

My day-to-day covers API design, data modelling, background job pipelines, real-time messaging, and role-based access across a multi-tenant architecture. I care about systems that are correct under load, easy to reason about, and that make centres more operationally efficient.

I also take on ELT-adjacent projects: custom platforms, integrations, and tools for centres and publishers that need software shaped around how they actually work.

I go by Deniz in Turkish settings and Sahand in Persian. Same person, one practice.

What I do

I spend a lot of my time solving problems with code, but it usually starts before that, with noticing what feels off. Things people repeat without questioning. Steps that do not need to exist. Flows that almost make sense, but not quite. That slight wrongness is what gets my attention, and once I notice it I tend to stay with it until I understand where it actually comes from.

From there it is about building something that removes the friction rather than works around it. Making things a bit simpler, a bit more reliable. Cutting the repetition, clarifying how things move, getting a system to behave in a way that feels natural rather than forced. I pay attention to the small details because that is almost always where the real problem is hiding, not in the obvious places, but in the quiet gaps between them.

Nothing too dramatic. I just like leaving things easier than I found them.

Projects

ELTica, live

eltica.org, demo at dev.eltica.org

A multi-tenant SaaS platform for English language teacher-training operations. It covers the full programme lifecycle for CELTA, DELTA, TEFL, and TESOL, from application and pre-interview tasks through interview scheduling, document management, payments, and certificate issuance. Training centres get one coherent system in place of a patchwork of tools.

Currently serving ITI Istanbul, with a second centre onboarding.

Live product Private codebase Productioneltica.org Demodev.eltica.org

For demo credentials or access questions: sahand@eltica.org

Homepage

Courses

Online English level assessment

A focused placement assessment flow for learners and partner schools. Designed for centres that need reliable level placement before enrolment, without a separate testing platform.

Stack

Frontend
Next.js, React, TypeScript, Tailwind CSS
Backend
Node.js, Express, Prisma ORM
Databases
MySQL, Redis, MongoDB

Contact

Email is the fastest channel, whether you need demo access, have product questions, or want to talk through a project.

If you are building something in ELT, training operations, or custom platforms, I am glad to explore whether we are a fit.