Application Services and Modernization

Application Services and Modernization for Digital Capabilities

Toptal's application development and modernization services help businesses develop, modernize, and innovate their digital capabilities. Get end-to-end product and software development from a global talent network with subject matter expertise in architecture and engineering. 
4.8 / 5.0 on

Based on 1648 reviews as of November 02, 2023

Balazs Welker

Team Leader

Featured Full Team of Application Development and Modernization Specialists

Balazs Welker

Software Developer

Balazs has 10 years of experience in IT, working as a software engineer, PM, and game developer. He's an experienced web developer specializing in TypeScript, React, and React Native. Balazs's deep full-stack experience includes Node.js, Express.js, GraphQL, PostgreSQL, and MongoDB.

Previously at


Engineering Experience

10+ Years

Xingkui Wang

Front-end Developer

Xingkui is a full-stack developer who has 10+ years of front-end and 3+ years of back-end experience. He has lots of work experience in web development for enterprise and consumer products. He also worked as a co-founder of a startup for about two years. He works as a freelancer to balance work and life now. He prefers to work in JavaScript, CSS, HTML, and React on the front end and Node.js on the back end.

Previously at


Engineering Experience

17+ Years

Timothy Mensch

Senior software Architect

Tim is a senior software architect/engineer generalist. He has built the technology stack for multiple startups from the ground up. He also has experience rescuing projects and turning train wrecks into successful launches. He has worked in many domains, including retail, banking, internet of things, high-performance servers, machine learning, gamification, and scalable application server design