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Check out a sample of the 1,896 Back-End Developers jobs posted on Upwork

30+ hrs/week
Hours needed

More than 6 months
Duration

Expert
Experience level

I am a senior Azure cloud developer looking to enhance my backend development skills and am seeking a knowledgeable mentor to guide me…

Back-End Development Software Architecture & Design CI/CD RESTful API Database API Python
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Backend Jazeb445 Fixed-price ‐ Posted 1 day ago

$80
Fixed-price

Entry
Experience level

Jazeb445 AWS is what we need to set up. Once it is up we should be able to within a month get the rest done. When we do we can make or…

Back-End Development Database
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OpenPay integration to Dash Plotly Hourly ‐ Posted 1 day ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Intermediate
Experience level

I am looking for a developer with experience in payment integration, in particular with Openpay. I have an application based on Flask/…

Back-End Development Plotly API Python Dash
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$300
Fixed-price

Expert
Experience level

We require an AWS expert to implement an OpenID Connect (OIDC) identity provider (IdP) in AWS IAM and to associate this IdP with an AWS…

Back-End Development API Amazon Web Services
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$500
Fixed-price

Expert
Experience level

Seeking a Senior PHP developer who has experience working with APIs specifically for trading APIs and trading.

Back-End Development API Development PHP API Integration RESTful API API
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Recreate tennisrecord.com Hourly ‐ Posted 1 day ago

Less than 30 hrs/week
Hours needed

3 to 6 months
Duration

Intermediate
Experience level

Would like to understand the cost and timeframe to re-create tennisrecord.com and the backend algorithm to calculate dynamic ratings.…

Back-End Development JavaScript API Database
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Looking for Python dev familiar with Google Oauth Fixed-price ‐ Posted 1 day ago

$5
Fixed-price

Entry
Experience level

Looking for a Python Developer familiar with Google OAUTH. The main task is to enable google auth to allow us to connect to specific…

Back-End Development OAuth API Python
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Blockchain dev required for community project Fixed-price ‐ Posted 1 day ago

$1,000
Fixed-price

Expert
Experience level

Have a set budget as specified for two tasks: 1) to assist with remaining tasks on our nft marketplace where social and environmental p…

Back-End Development Blockchain Architecture Blockchain
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Use TypeScript to download m3u8 and merge to mp4.
New
Fixed-price ‐ Posted 23 hours ago

$100
Fixed-price

Intermediate
Experience level

Test URL: https://video.twimg.com/amplify_video/1779320038442299392/pl/kp_DjVfP7SUXMZox.m3u8?variant_version=1&tag=14&container=cmaf…

Back-End Development JavaScript
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Clean Up My Rust / Solana 120 line program code
New
Hourly ‐ Posted 21 hours ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Intermediate
Experience level

Good evening, I need to have my code revised and make it work 100%. It is for freezing token holder accounts on the solana blockchain.…

Back-End Development Blockchain Development Blockchain
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