Find the best Back-End Development jobs

It takes just one job to develop a successful relationship that can propel your career forward.
Find work Interested in hiring?

Professionals on Upwork rate clients
Rating is 4.9 out of 5.
4.9/5

on average from 2M+ reviews

Trusted by

Check out a sample of the 1,870 Back-End Developers jobs posted on Upwork

API Integration with Home Assistant Fixed-price ‐ Posted 1 day ago

$100
Fixed-price

Entry
Experience level

Integrating hotel check-in/check-out data with Home Assistant The Project: * ⁠Develop a custom Home Assistant integration (https://de…

Back-End Development API Integration Python
See more
Python Bug Fixing with Nengo Library
New
Hourly ‐ Posted 23 hours ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Expert
Experience level

Seeking skilled Python developer with expertise in Nengo library to fix bug in project. Responsibilities include identifying and implem…

Back-End Development .NET Framework MongoDB API Python
See more
Deploy Solidity contracts
New
Hourly ‐ Posted 22 hours ago

30+ hrs/week
Hours needed

More than 6 months
Duration

Entry
Experience level

Create ERC20 Create Miners (Banana Miner fork) Fork other Web 3 projects Create Liquidity pool

Back-End Development Smart Contract
See more
Help in a rust-bitcoin project
New
Hourly ‐ Posted 16 hours ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Intermediate
Experience level

Help me with building a a share trading prototype using regtest , and a channel construction, I plan to use a threshold signature to re…

Back-End Development Blockchain Bitcoin Rust
See more
Write two CLI utilities for ELF files in Rust and open source
New
Fixed-price ‐ Posted 15 hours ago

$300
Fixed-price

Intermediate
Experience level

This job requires that the candidate - understands open source - understands GitHub PRs - understands Rust - understands command line (…

Back-End Development Rust
See more
OpenEMR API Integration
New
Fixed-price ‐ Posted 23 hours ago

$1,000
Fixed-price

Intermediate
Experience level

OpenEMR integration to a government healthcare API, to facilitate seamless data exchange. API documentation work expertise needed. Know…

Back-End Development Web Development API Development RESTful API API Integration PHP
See more
Install Tealium Tag on Website hosted by GoDaddy
New
Fixed-price ‐ Posted 22 hours ago

$100
Fixed-price

Intermediate
Experience level

I'm seeking an experienced individual who can have this completed within 2-3 days. Specifically, I need someone to install a Tealium Ta…

Back-End Development Front-End Development HTML
See more
Call my restapi from OpenAI assistants API
New
Fixed-price ‐ Posted 18 hours ago

$5
Fixed-price

Intermediate
Experience level

I have my working assistant (within OpenAI assistants API. Now under particular circumstances (when his basic instruction lacks data on…

Back-End Development API Integration Python Node.js API
See more
Someone to teach me better practices with FastAPI
New
Hourly ‐ Posted 16 hours ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Expert
Experience level

I need someone to help improve my discord clone FastAPI backend and to teach me better practices. I would like to learn what goes on in…

Back-End Development Unit Testing English Docker Python PostgreSQL
See more
GEM Portal Tender Submission
New
Fixed-price ‐ Posted 15 hours ago

$50
Fixed-price

Intermediate
Experience level

We are looking for a freelancer who can assist us in submitting customized tenders on the GEM Portal. The freelancer will be responsibl…

Back-End Development JavaScript Content Writing Web Development PHP
See more

Your next job starts right here

Set up a free profile to showcase your skills, experience and desired pay rate to clients. You choose the payment method that's best for you to easily get paid for your work.

Find work
Upwork Payment Protection
Gives you security and peace of mind
See how it works