312 Best Mid Level JSON Freelance Contractor Developers For Hire In October 2025

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selected:

Mid Level [ x ] JSON [ x ] freelance [ x ] contractor [ x ]

framework:

+ React JS (286) + Node JS (272) + Express JS (224) + Sencha Ext JS (224) + Next JS (223) + jQuery (159) + Vue JS (108) + Angular JS (81)

language:

+ TypeScript (282) + Vanilla JS (242) + JavaScript (217) + Python (124) + PHP (68) + Java (60) + C# (36) + Go Golang (27)

utility:

+ Three JS (66) + Redux JS (57) + GraphQL JS (51) + Jest JS (38) + Webpack JS (29)

ui:

+ CSS (156) + EJS (93) + Tailwind CSS (73) + bootstrap (39) + SASS (36)

career:

+ Junior (138) + Senior (128) + Manager (29) + CTO (13)

stack:

+ Front End (269) + Full Stack (248) + Back End (175) + MERN stack (8)

db:

+ MongoDB (202) + SQL (143) + Postgres (PostgreSQL) (72) + MySQL (67) + Firebase (33)

server:

+ AWS (78) + docker (66) + Linux (34) + Google Cloud (20) + Amazon SES (16)

program:

+ Git (223) + Jira (106) + GitHub (67) + Figma (43) + Postman (19)

concept:

+ HTML (134) + software (106) + OOP (102) + api (82) + mobile app (70)

speaking:

+ English (311) + Spanish (39) + Hindi (33) + French (19) + Portuguese (19)

worker type:

+ full time (263)

us state:

+ California (22) + Texas (13) + New York (10) + Florida (6) + Illinois (5) + Ohio (5)

country:

+ United States (112) + India (36) + Canada (25) + Brazil (12) + Australia (9)

country region:

+ North America (144) + Asia (56) + South Asia (50) + Europe (23) + Eastern Europe (22)

Filters:

selected:

Mid Level [ x ] JSON [ x ] freelance [ x ] contractor [ x ]

framework:

+ React JS (286) + Node JS (272) + Express JS (224) + Sencha Ext JS (224) + Next JS (223) + jQuery (159) + Vue JS (108) + Angular JS (81)

language:

+ TypeScript (282) + Vanilla JS (242) + JavaScript (217) + Python (124) + PHP (68) + Java (60) + C# (36) + Go Golang (27)

utility:

+ Three JS (66) + Redux JS (57) + GraphQL JS (51) + Jest JS (38) + Webpack JS (29)

ui:

+ CSS (156) + EJS (93) + Tailwind CSS (73) + bootstrap (39) + SASS (36)

career:

+ Junior (138) + Senior (128) + Manager (29) + CTO (13)

stack:

+ Front End (269) + Full Stack (248) + Back End (175) + MERN stack (8)

db:

+ MongoDB (202) + SQL (143) + Postgres (PostgreSQL) (72) + MySQL (67) + Firebase (33)

server:

+ AWS (78) + docker (66) + Linux (34) + Google Cloud (20) + Amazon SES (16)

program:

+ Git (223) + Jira (106) + GitHub (67) + Figma (43) + Postman (19)

concept:

+ HTML (134) + software (106) + OOP (102) + api (82) + mobile app (70)

speaking:

+ English (311) + Spanish (39) + Hindi (33) + French (19) + Portuguese (19)

worker type:

+ full time (263)

us state:

+ California (22) + Texas (13) + New York (10) + Florida (6) + Illinois (5) + Ohio (5)

country:

+ United States (112) + India (36) + Canada (25) + Brazil (12) + Australia (9)

country region:

+ North America (144) + Asia (56) + South Asia (50) + Europe (23) + Eastern Europe (22)

Timezone:

(includes +1/-1 hour)

Featured Mid Level JSON Freelance Contractor Developers

1 to 20 of 312 devs ( view all 1690 devs )

Full Stack Developer

Boston, US or remote

Full Stack Projects Built BellaLingua, an Italian language learning platform currently in beta; designed interactive lessons, exercises, and...

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Front End Developer

Pittsburgh, Pennsylvania, US or remote

My career has taken me through a number of verticals across a wide array of projects: - I was the sole engineer of a design system for Nuix, where I...

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Lead Software Engineer

Lewis Center, Ohio, US or remote

Lead software engineer in Lewis Center, OH. I specialize in full-stack dev with React, Java, Ruby on Rails and more. I'm an AWS wizard with expertise...

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Software developer

Austin, Texas, US or remote

For full list of experiences and projects, look at my LinkedIn or website. Experiences: Digital Business Analyst, McKinsey & Company...

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Product Engineer

Tampa, Florida, US or remote

I'm a very passionate web engineer with 10+ years of experience. I have an eye for detail, both visually and functionally, balanced with a big...

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Web Designer, Web Developer (Shopify, WordPress, Webflow, WooCommerce, Drupal), Graphic Designer

Miami Beach, Florida, US or remote

Experienced professional in the advertising and marketing agency industry. Renowned for my exceptional ability in helping businesses get ahead and...

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Front End Engineer

Frisco, Texas, US or remote

Skilled Front End Engineer with over 5 years of experience developing dynamic, user-centric applications. Expert in JavaScript, TypeScript, React.js,...

Mid Level JSON freelance contractor react node typescript vanilla js

Frontend Engineer

Los Angeles, California, US or remote

Comcast Business — Remote Software Engineer IV July 2022 - April 2024 - Implemented a working solution for MUI accessibility bug— improving...

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Web-Based software engineer

Los Angeles, California, US or remote

# Professional Experience ## Web Based Full Stack Engineer, Skechers (2015 – 2025) Built b2c e-commerce website and internal marketing tools....

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Senior Software Engineer & Technical Project Manager

Austin, Texas, US or remote

At Etumos (Marketo CRM consultancy) • Built Marketo API-integrated projects with NodeJS, ReactJS, & AWS (including EC2, Lambda, “Serverless”...

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Senior Web Developer

Orlando, Florida, US or remote

Worked on several SaaS products in PHP, JavaScript, and TypeScript. Created custom SaaS Dashboard using the Yii PHP framework with a MySQL database....

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Fullstack Engineer

Las Vegas, Nevada, US or remote

Projects I've created - Devarity First software experience in highschool. Startup to support indie game developers. Online retail store with...

Mid Level JSON freelance contractor react node typescript angular

Web Developer

Berkeley, California, US or remote

Frontend web developer with over five years of experience, including at EnChroma Inc. where I focused on building and maintaining performant and...

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Senior Frontend Software Engineer

Bronx, New York, US or remote

JOCKMKT | Senior Frontend Engineer | Remote | Nov 2022 - Oct 2023 - Developed and Maintained JockMKT’s React Native and NextJS web applications -...

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Software Engineer

Providence, Rhode Island, US or remote

Northrop Grumman | Middletown, RI | Feb 2017 – Present Seaware LMS - Learning Management System for US Navy ● Developed for a Learning...

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Software Engineer

Phoenix, Arizona, US or remote

Dermoscopic Image Classification - An implementation of the U-Net segmentation model applied to skin lesion classification in order to get binary...

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Software Engineer

Los Angeles, California, US or remote

Senior Web Developer (KettleSpace Inc) - Lead the front-end work for kettleOS Admin and Enterprise software (React, styled-components, grommet,...

Mid Level JSON freelance contractor react typescript vue jquery

Frontend Web Developer

Portland, Oregon, US or remote

Lute (Open Source Contributor) - Rewriting UI of Python/Flask desktop app using React with Vite - Writing unit tests using Jest - Implementing UI...

Mid Level JSON freelance contractor react node typescript angular

Software Engineer

National City, California, US or remote

I've been working as a software developer for my current job for more than 6 years, and before that, a startup for a couple years where I work on...

Mid Level JSON freelance contractor react node typescript angular

Front-end Developer/Engineer

Chicago, Illinois, US or remote

I am a full-stack developer and designer with 9+ years of experience in creating user-friendly digital products and web solutions. I work with small...

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