Find the Best Back-End Developers Jobs
Check out a sample of the 1,129 Back-End Developers jobs posted on Upwork
Conversions API Implementation
Hours needed
Duration
Experience level
We need a developer to implement the Conversions API for both our app and website. The work includes setting up the API integration, en…
Web Developer for Website Fixes
Hours needed
Duration
Experience level
I need a freelancer to fix minor issues on my website. The work includes reviewing current problems, making necessary updates, and ensu…
AI HTML Website Review and Security Check
Hours needed
Duration
Experience level
I need a developer to review a website I built using AI-generated HTML and ensure everything is working properly on the back-end. The w…
Zoho Implementation Partner Needed - Training Company Back-Office Operations Platform
Hours needed
Duration
Experience level
I'm a vendor-agnostic transformation consultant sourcing development quotes on behalf of a client. I am not the end client and I am not…
Backend Engineer: Payments platform, Node/TypeScript, PostgreSQL, ledger & API integrations.
Fixed-price
Experience level
Overview We are building a cross-border payments platform. The domain layer already exists — a tested TypeScript core with a double-ent…
Senior WordPress/PHP Developer for Custom Assessment & Scoring Engine
Hours needed
Duration
Experience level
We are looking for a senior WordPress/PHP developer to implement a proprietary online self-reflection assessment for Dutch-speaking wom…
Senior Software Engineer
Hours needed
Duration
Experience level
We’re looking for an experienced Senior Software Engineers to join a team building and scaling a modern poker platform. The ideal cand…
Full Custom Build Required - Training Company Back-Office Operations Platform (Supabase, EU-Based)
Hours needed
Duration
Experience level
I'm a vendor-agnostic transformation consultant sourcing development quotes on behalf of a client. I am not the end client and I am not…
Instagram and X (Twitter) setup and launch for a boutique law firm, minimalist editorial style
Fixed-price
Experience level
Project overview LV Law, a boutique cross-border law firm, is launching its presence on Instagram and X (Twitter). This is a fixed, sho…
Roblox Developer Needed to Build “Steal a Kingdom” – Full Multiplayer Game
Hours needed
Duration
Experience level
Please read the full post before applying. Start your proposal with “ROYAL CROWN” so I know you read it. I’m looking for an experience…
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