Hi, I'm

Sezgi Altan

Software engineer building robust web and mobile experiences that just work - and look good doing it.

About

about.ts

const sezgi = {
  role: "Software Developer",
  basedIn: "Antalya, Turkey",
  builds: ["scalable web apps", "cross-platform mobile"],
  hasWorkedAt: ["FactSet", "Jotform", "a couple agencies I founded"],
  cares: ["clean UI/UX", "design systems", "bridging tech + business"],
  traits: ["Product-minded", "Design-conscious", "Adaptable"],
};

Work Experience

Lead Software Engineer & Founder · Viseon Studio

2025 – 12/2025

Antalya, Turkey

Established and led technical strategy for a creative media agency, overseeing end-to-end development of digital solutions for diverse clients
Architected and built the agency's core web infrastructure from scratch — frontend performance (UX/UI) through backend deployment
Translated complex client requirements into technical roadmaps, ensuring delivery of high-quality digital products aligned with business goals

Software Engineer · FactSet

11/2023 – 07/2025

Norwalk, USA | Remote

Developed and maintained interactive dashboards using Vue.js; participated in core migration from Vue 2 to Vue 3, using Composition API and modern data-viz techniques
Contributed to pixel-perfect UI improvements, playing a key role in visual redesign and usability enhancement of the dashboard
Collaborated on FactSet's open-source project Stach — contributing code and integrating it into production-level applications
Ensured high-quality, maintainable code in an agile, cross-functional team focused on performance, scalability, and user satisfaction

Frontend & Mobile Developer · simpliers

01/2023 – 11/2023

Denizli, Turkey

Led end-to-end frontend development and visual overhauls for the Simpliers website (Vue.js), enhancing UX for global giveaway creators
Designed and engineered two mobile apps from scratch: Simpliers Giveaway App (React Native) and Anonym Stories for Instagram (Flutter)
Enabled seamless cross-platform giveaway creation across web and mobile, contributing to increased user engagement and retention
Collaborated with high-profile influencers on CEO-focused technical blog content; prepared weekly analytical reports for strategic management meetings

Lead Software Engineer & Co-Founder · artrodite

2023 – 12/2023

Denizli, Turkey

Co-founded a 360° digital branding agency providing end-to-end software and design services to startups and SMEs
Responsible for full SDLC of all internal and client projects, ensuring high performance and SEO optimization
Managed cross-functional responsibilities from technical implementation to project management, delivering tailored digital identities for brands

UI Developer · Jotform

03/2022 – 09/2022

Turkey | Remote

Developed and maintained reusable UI components with a focus on performance, accessibility, and responsiveness
Collaborated with UX designers and frontend teams to enhance UX across Jotform's form builder and admin interfaces
Contributed to design system consistency; implemented UI improvements based on user feedback and A/B testing

Skills

Languages

JavaScript (ES6+)TypeScript

Frontend

React.jsVue.jsHTML5CSS3/SASSTailwind

Mobile

React NativeFlutter

Testing & Tools

JestReact Testing LibraryGitWebpack/ViteCI/CD Principles

Design & Architecture

Design SystemsResponsive DesignUI/UX Collaboration

Projects

🖥️Web App · preview soon

Real Estate Appointment System

Modern Vue 3 application for managing real estate appointments with agents and clients. Features appointment scheduling, agent assignment, contact management, advanced filtering, and real-time search with a responsive mobile-first design.

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📱Mobile App · preview soon