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Check out a sample of the 1,832 Back-End Developers jobs posted on Upwork

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Expert
Experience level

I've been told the current affiliate tracking systems don't track on YouTube (s2s, cookies). The goal is to set up a method to track pa…

Back-End Development Affiliate Marketing Database Design API
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API connection issue Hourly ‐ Posted 1 day ago

Less than 30 hrs/week
Hours needed

Less than 1 month
Duration

Expert
Experience level

We have API published on IIS by another company. When calling from the local network it's working fine but from outside it isn't. We ch…

Back-End Development API Development RESTful API API Integration API
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Senior Rust Engineer
New
Hourly ‐ Posted 23 hours ago

Less than 30 hrs/week
Hours needed

1 to 3 months
Duration

Expert
Experience level

We are seeking a highly skilled Senior Rust Engineer to join our team. As a Senior Rust Engineer, you will be responsible for developin…

Back-End Development Golang Rust RESTful API Software Architecture & Design
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Caddy admin api
New
Fixed-price ‐ Posted 21 hours ago

$150
Fixed-price

Intermediate
Experience level

I need a simple set up for caddy. 1. We need a caddy for our domains. 2. We need to be ale to update it using caddy's admin API. For…

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Looking for a "Buildship" low code expert
New
Hourly ‐ Posted 20 hours ago

30+ hrs/week
Hours needed

More than 6 months
Duration

Intermediate
Experience level

We are looking for a Buildship low-code specialist to join us in the long-term building backend for different Flutterflow apps.

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Method CRM Corr Hourly ‐ Posted 1 day ago

not_sure
Hours needed

Less than 1 month
Duration

Expert
Experience level

Fixtures from method software, knowledgeable screens

Back-End Development CRM Software
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$800
Fixed-price

Expert
Experience level

Looking for a back end developer to complete the back end and Stripe payment capture integration for our play to earn web app game. An…

Back-End Development Ubuntu Database Management Payment Processing Stripe Unity API Integration PHP
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Senior Rust Developer with Solana Experience
New
Hourly ‐ Posted 23 hours ago

Less than 30 hrs/week
Hours needed

More than 6 months
Duration

Expert
Experience level

We are seeking a highly experienced Senior Rust Developer who has a proven track record of working with Solana. As a Senior Rust Develo…

Back-End Development RESTful API Software Architecture & Design API
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30+ hrs/week
Hours needed

More than 6 months
Duration

Expert
Experience level

Bachelor’s/Master’s degree in Engineering, Computer Science (or equivalent experience) At least 2+ years of relevant experience with Py…

Back-End Development Python
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30+ hrs/week
Hours needed

1 to 3 months
Duration

Intermediate
Experience level

I'm seeking a PHP developer proficient in WordPress to handle a single task for my website. The site is fully prepared, and I only requ…

Back-End Development JavaScript PHP API
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