| Ícaro Niz

Frontend engineering
with leadership depth.

13+ years building scalable web applications and leading frontend teams. Specialised in React, TypeScript, and modern frontend architecture in fast-paced, product-focused environments.

View experience

React TypeScript Next.js Symfony Docker TDD

Senior Frontend Engineer & Technical Lead

Over a decade building web applications and leading frontend initiatives across product-focused teams. My work spans frontend architecture, real-time applications, technical roadmapping, mentoring, code reviews, testing strategies, and close collaboration with product and design stakeholders.

I care about frontend performance, developer experience, and building software that creates real value for users — not just software that ships.

I believe in clean, maintainable code, strong team collaboration, and continuous improvement. The best engineering comes from teams that trust each other and share ownership of quality.

Tech stack

Frontend

React · TypeScript
Next.js · AngularJS

Backend

PHP · Symfony
WebSockets · RabbitMQ

Infra & DevOps

Docker
GitLab CI/CD · Azure

Data

MySQL · Redis

Testing & Practices

TDD · DDD
Pair Programming

Leadership

Mentoring · Hiring
Architecture · Roadmapping

Career

Jul 2024 – Present

Frontend Tech Lead

KenTech S.L.U.

Led frontend architecture and technical roadmap for an international sports betting platform across multiple markets.
Owned end-to-end technical direction: architecture decisions, code review standards, mentoring engineers, and collaborating with product and design.
Introduced and scaled TDD and automated testing practices across a legacy codebase.
Actively involved in frontend hiring — defining criteria, conducting interviews, and evaluating candidates.
Built and maintained real-time UIs using WebSockets and streaming data pipelines.

React TypeScript Next.js WebSockets Architecture TDD

Sep 2022 – Jun 2024

Senior Frontend Developer

KenTech S.L.U.

Took on expanded technical ownership of the frontend codebase while continuing product development.
Drove adoption of React + TypeScript across the team and participated in frontend architecture decisions.
Led code reviews and contributed to technical hiring.
Pushed for better engineering practices including pair programming and automated testing on legacy code.

React TypeScript Next.js AngularJS TDD

Sep 2021 – Aug 2022

Full-Stack Developer

Apiumhub S.L.

Developed and maintained a B2B platform for an international client, with a .NET backend and ReactJS frontend deployed on Azure.
Worked in a team with a strong engineering culture — frequent coding katas, TDD, and continuous integration from day one.

React TypeScript C# .NET Azure TDD

Apr 2019 – Sep 2021

Frontend Developer

KenTech S.L.U.

Built and maintained frontend features for a multi-microservice sports betting platform integrated with third-party providers including BetGenius, iForium, and Flutterwave.
Worked in a Scrum team with regular pair programming and contributed to deployment pipeline improvements.

React AngularJS WebSockets Docker Scrum

Earlier

Frontend / Full-Stack Developer

Inventia Plus · Domibay · Lopesan Hotels · Ironika

Web development and technical leadership across multiple companies and product domains.

Featured work

Frontend · Real-time

Betting Platform Architecture

Scalable frontend systems connected to microservices and real-time data providers for international audiences.

React · .NET · Azure

B2B Enterprise Application

Full-stack system with CI/CD pipeline on Azure, built for international clients with high reliability requirements.

Tooling · DX

Internal Developer Tools

Automation and tooling to improve developer workflows, reduce friction, and boost team productivity.

Let's talk

Open to new opportunities, collaborations, or a good conversation about frontend architecture, team leadership, or engineering culture. Feel free to reach out.

icaro.niz@gmail.com linkedin.com/in/icaroniz Canary Islands, Spain

Frontend engineeringwith leadership depth.

Senior Frontend Engineer & Technical Lead

Tech stack

Career

Featured work

Betting Platform Architecture

B2B Enterprise Application

Internal Developer Tools

Let's talk

Frontend engineering
with leadership depth.