Siim Mardus

Siim Mardus

Founder&Engineer

Siim Mardus

I build software, websites & systems from idea to launch.

  • Estonia/Tartu
  • Product Management
  • Full-Stack Dev

My work

Products and platforms I've shipped

01Founder & Engineer · 2025 — Present

Kopka Tech

Founded Kopka Tech to help Estonian businesses with the digital side of their work — websites, custom software, and marketing. I keep hands-on end to end: marketing, client communications, project planning and writing code. I believe that small- to mid-sized companies also deserve high-end solutions, and with the rise of AI tooling, Kopka aims to make it accessible for them.

  • Leadership
  • Sales
  • Engineering
  • Software
  • Web development
  • Marketing
kopka.ee
02Senior Software Engineer · 2019 — Present

Glia

Where I started my professional engineering career in 2019. Glia builds AI-powered banking software used by 700+ financial institutions. I joined as a full-stack intern, grew into frontend and platform work, and now ship as a senior full-stack engineer.

  • Javascript
  • React
  • Ruby
  • Elixir
  • Platform
  • Voice
  • Video
  • SMS
glia.com
03Co-founder & Engineer · 2024

Skipster

Co-founded and built the software for Skipster in 2024 — a platform for food trucks and small restaurants. Digital order queues, kitchen management, SMS notifications, and sales reporting so teams can ditch paper tickets and serve faster.

  • Co-founder
  • TypeScript
  • SaaS
  • Food service
skipster.ee
04Father · 2023 — Present

A Father

More important than any of my other work is my family with two amazing daughters. I aim to be as present for them as possible and give them a childhood full of happy memories with the family. I guard my time for them, and try not let work take priority. Among other traits, becoming a parent has (at least) quadrupled my productiveness.

01Full-stack · Platform · Product

Software Engineering

10+ years of studies & experience — senior full-stack developer with experience in infrastructure, databases, platform development & real-time communications. I've contributed to numerous high-impact projects at Glia, built the Skipster application and have led, planned and developed all Kopka Tech's projects — varying from unique websites to complex e-commerce systems & workflow software. I care about solutions that stay maintainable after launch, not just demos that ship once.

Frontend

  • React
  • TypeScript
  • Next.js
  • JavaScript
  • HTML
  • CSS
  • Tailwind
  • Framer Motion
  • i18n
  • Design systems

Backend

  • Ruby
  • Elixir
  • Node.js
  • Express
  • PostgreSQL
  • MongoDB
  • DynamoDB
  • JWT / Auth

Infrastructure & delivery

  • AWS
  • Google Cloud
  • Docker
  • Vercel
  • Heroku
  • Railway
  • Turborepo
  • CI/CD
  • Git
  • Jenkins
  • Vitest
  • Playwright
  • Jira
  • Notion

Integrations & comms

  • WebRTC
  • Voice
  • Video
  • WebSockets
  • SMS
  • Twilio
  • Email
  • Stripe
  • OpenAI
  • Anthropic
  • Platform SDKs
02Clear thinking · Shared context

Communication & Teamwork

Good software is a team sport and great communication is key to victory. I've worked inside both small and large organizations and run client-facing studio work at Kopka — in all cases, the most frequent bottlenecks are not caused by code. It's alignment, honest tradeoffs, and keeping everyone oriented toward the same outcome.

  • 01

    Client & stakeholder comms

    At Kopka I own the full client arc — discovery calls, scoping, progress updates, and launch handoffs. I translate technical constraints into plain language and vice versa.

  • 02

    Cross-functional delivery

    At Glia I partnered with product, design, and ops across many types of projects. I write plans that engineers can execute, PRs that reviewers can trust, and docs that don't rot in a wiki. In Slack, I make sure that my communication on project updates or day-to-day matters is clear and effective.

  • 03

    Pragmatic collaboration

    I prefer short feedback loops over long planning cycles. Async when it helps, sync when it matters — standups, pairing, and direct conversations when something or someone is stuck.

The best projects I've worked on had one thing in common: clear & continuous communication ensuring that everybody always knew 'where are we at', 'what are we doing' & 'where are we going'.

03Founder · Co-founder · Senior IC

Leadership

Leadership, for me, means owning the outcomes. I've grown from intern to senior engineer inside a large product company, co-founded a SaaS, and started a studio where I still keep hands on the production code.

  1. 2019 — 2024

    Glia — grow into the work

    Joined as a full-stack intern. Took on frontend and platform ownership, learned to ship inside process without losing velocity.

  2. 2024 — Present

    Glia — senior full-stack

    Lead feature projects end-to-end on banking AI codebase. Mentoring, driving technical discussions, and staying close to production delivery.

  3. 2024

    Skipster — co-founder

    Built SaaS with order queues, kitchen screens, and SMS tooling for food trucks and small restaurants. Product, engineering, and go-to-market responsibilities from day one.

  4. 2025 — Present

    Kopka Tech — founder

    Development studio for supporting Estonian businesses — websites, custom software, marketing. I run sales, delivery, and engineering, with AI tooling making high-end work accessible to SMBs.

Writing

Thoughts, opinions, and write-ups

Notes on building software, running a studio, and working inside product companies — plus selected articles from the Kopka Tech blog.

4 min read

There is a difference between AIs

I constantly see promises of free lunches across the web and software development landscape. Unrealistically cheap website offers from agencies and the impression of all-powerful AI are leaving a very false understanding of reality.

  • Opinion
  • AI
  • Web development

Contact

Get in touch

Open to product work, engineering leadership, and studio collaborations. Whether you are scaling a product team or need a hands-on builder for a focused launch, say hello.

Email me
Location
Tartu, Estonia
Availability
Available for select projects