Find the Best Back-End Developers Jobs

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Check out a sample of the 1,337 Back-End Developers jobs posted on Upwork

AWS and Python Developer

New
Hourly ‐ Posted 14 hours ago
Less than 30 hrs/week
Hours needed
More than 6 months
Duration
Intermediate
Experience level

We are seeking an experienced developer to build a Python-based application that integrates with Amazon S3 and PostgreSQL. The project…

Back-End DevelopmentAmazon Web Services
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Less than 30 hrs/week
Hours needed
Less than 1 month
Duration
Expert
Experience level

We’re looking for a developer who can implement a feature that spans mobile, backend, and AI/LLM layers. The scope is focused, the requ…

Back-End DevelopmentFlutterReact NativeGitLabDockerRedis
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Less than 30 hrs/week
Hours needed
More than 6 months
Duration
Intermediate
Experience level

We are seeking a skilled blockchain and web3 engineer to help build an e-commerce platform. The ideal candidate will have experience in…

Back-End DevelopmentEthereumBlockchainNode.jsEngineering Design
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Backend Developer

New
Fixed-price ‐ Posted 12 hours ago
$1,500
Fixed-price
Intermediate
Experience level

We are looking for a Backend Developer to join our team and work on game development projects. This is a project-based position with an…

Back-End DevelopmentNode.jsJavaScriptAPI
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Full Stack Developer for E-Commerce

New
Hourly ‐ Posted 11 hours ago
Less than 30 hrs/week
Hours needed
1 to 3 months
Duration
Intermediate
Experience level

We are seeking a skilled Full Stack Developer to enhance our existing E-Commerce platform. The ideal candidate will have experience in…

Back-End DevelopmentNext.js
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Senior AI/Backend Engineer

New
Hourly ‐ Posted 14 hours ago
30+ hrs/week
Hours needed
More than 6 months
Duration
Expert
Experience level

Join our team as a Senior AI/Backend Engineer to develop and maintain our RAG and Platform Core using Python. You'll work on AI-driven…

Back-End DevelopmentHTML5Embedded CJavaScriptPHP
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Blockchain Engineer for Ethereum Platform

New
Hourly ‐ Posted 13 hours ago
Less than 30 hrs/week
Hours needed
3 to 6 months
Duration
Intermediate
Experience level

We are seeking a skilled blockchain engineer to enhance our Ethereum-based e-commerce platform. The ideal candidate will have experienc…

Back-End DevelopmentSolidityCryptocurrencyEthereumBlockchainBlockchain DevelopmentMicrocontroller ProgrammingEmbedded CReverse EngineeringNode.js
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$5
Fixed-price
Intermediate
Experience level

We are seeking a skilled Full Stack / Agentic AI System Engineer to develop and maintain a multi-tenant SaaS platform. The role involve…

Back-End DevelopmentClaudeNext.jsNode.jsTypeScriptPythonAPISaaSJavaScript
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30+ hrs/week
Hours needed
More than 6 months
Duration
Expert
Experience level

We are an early-stage startup based in Zebulon, GA, US. We are a diverse group of disciplined software engineers focused on IT outsourc…

Back-End DevelopmentCommunications
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Node.js Code Review (1 Hour Task)

New
Fixed-price ‐ Posted 10 hours ago
$10
Fixed-price
Expert
Experience level

I’m looking for an experienced Node.js developer to review a small codebase and provide feedback. *Task includes:* Review existing No…

Back-End DevelopmentPHPJavaHTMLAngularJSAPIJavaScriptNode.js
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