OAuth is an authorization protocol enabling a third-party application to access resources, such as data and content, from another resource provider system on behalf of a user. An OAuth Developer is a specialist who has the technical capabilities to facilitate the secure transfer of data from one system to another. OAuth Developers work with clients who want to enable their users to transfer data from one application to another, as well as enable access to external resources with out having to provide credentials.

Essentially, OAuth Developers are responsible for ensuring that the proper security measures are in place for this data transfer, and interoperate various components in order to make it all happen. OAuth Developers require extensive knowledge in backend technologies and security protocols.

Here's some projects that our expert OAuth Developer made real:

  • Building secure single sign-on solutions (SSO)
  • Creating and configuring secure authentication between applications
  • Connecting web apps with external data sources, such as Office365
  • Developing mobile applications with cross platform functionality and secure integration
  • Developing visualizations for IOT systems using React, SGV and Elixir
  • Implementing OAuth 2.0 authentication protocols in different platforms, such as WP or Laravel
  • Integrating APIs with partner websites for secure authentication
  • Developing web apps with authentication protocols in .Net Core 6 and Angular

Our team of highly skilled OAuth developers have completed all kinds of projects related to ensuring the secure exchange of data between applications. If you are looking for a reliable way for your users go authenticate themselves on other systems securely, our developers can be trusted to deliver results on Freelancer.com. We invite you to post your own project now and hire an experienced OAuth Developer from our team!

From 17,942 reviews, clients rate our OAuth Developers 4.9 out of 5 stars.
Hire OAuth Developers

OAuth is an authorization protocol enabling a third-party application to access resources, such as data and content, from another resource provider system on behalf of a user. An OAuth Developer is a specialist who has the technical capabilities to facilitate the secure transfer of data from one system to another. OAuth Developers work with clients who want to enable their users to transfer data from one application to another, as well as enable access to external resources with out having to provide credentials.

Essentially, OAuth Developers are responsible for ensuring that the proper security measures are in place for this data transfer, and interoperate various components in order to make it all happen. OAuth Developers require extensive knowledge in backend technologies and security protocols.

Here's some projects that our expert OAuth Developer made real:

  • Building secure single sign-on solutions (SSO)
  • Creating and configuring secure authentication between applications
  • Connecting web apps with external data sources, such as Office365
  • Developing mobile applications with cross platform functionality and secure integration
  • Developing visualizations for IOT systems using React, SGV and Elixir
  • Implementing OAuth 2.0 authentication protocols in different platforms, such as WP or Laravel
  • Integrating APIs with partner websites for secure authentication
  • Developing web apps with authentication protocols in .Net Core 6 and Angular

Our team of highly skilled OAuth developers have completed all kinds of projects related to ensuring the secure exchange of data between applications. If you are looking for a reliable way for your users go authenticate themselves on other systems securely, our developers can be trusted to deliver results on Freelancer.com. We invite you to post your own project now and hire an experienced OAuth Developer from our team!

From 17,942 reviews, clients rate our OAuth Developers 4.9 out of 5 stars.
Hire OAuth Developers

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    19 jobs found

    I’m looking for a developer who can build a small, reliable tool that logs into my personal Gmail account and harvests only the subject lines from selected messages. Here’s what I need the application to do: • Authenticate securely with Gmail (OAuth 2.0 preferred, IMAP fallback is fine). • Let me choose the folder/label or a simple date range to target. • Pull every subject line in that scope, nothing else—no bodies, no sender addresses. • Export the results to CSV or JSON in a single click. • Run on Windows or in a lightweight web dashboard; whichever you find faster to ship is fine, provided setup is straightforward. I don’t need a full-featured mailbox crawler—just a focused, clean extractor that respects Gmail API quotas ...

    $23 Average bid
    $23 Avg Bid
    19 bids

    We are building an Azure-native B2B SaaS solution and need an experienced Windchill API / integration specialist to help design the integration architecture and implement a lightweight proof-of-concept (POC). Scope includes: Windchill → SaaS data extraction: Extract Bills of Materials (BOMs), part metadata, revision history and related structures from Windchill Handle multi-level BOMs and parent–child relationships SaaS → Windchill data pushback (nice to have in POC, required in later phases): Push cost or other calculated data back into Windchill objects/attributes Integration architecture: Advise on best practices for integrating Windchill (on‑prem) with an Azure-native multi-tenant SaaS Recommend patterns for authentication, pagination, error handling, and versi...

    $17 / hr Average bid
    $17 / hr Avg Bid
    44 bids

    I have a functioning app, but it currently lacks any native way to connect with external mailboxes. I need a developer who can wire up full OAuth-based access to both Gmail and Outlook so that my users can authorise their accounts, keep tokens fresh, and have new messages pushed back into the app in real time. Here’s the flow I have in mind. You will guide me through creating the Google Cloud Console and Azure AD projects from scratch, generate the client credentials, and then build the OAuth consent screens. Once credentials are in place, the app must handle the three-legged OAuth flow, store refresh tokens securely, and automatically renew access tokens without user intervention. For incoming mail, I want a webhook or push subscription strategy (Gmail Push Notifications / Microso...

    $309 Average bid
    $309 Avg Bid
    134 bids
    PHP Omnichannel Chat System
    5 days left
    Verified

    The task is to create a PHP-based omnichannel chat module that lets me manage Facebook, Instagram, and Telegram conversations from a single web dashboard. Core workflow • A settings page must let me securely connect the three platforms. • When someone writes to the linked Facebook Page, Instagram account, or Telegram bot, the message should appear instantly in the dashboard. • I must be able to send replies from the same interface, and the user should receive them in the original channel. Automation Automated DM replies are required for Facebook and Instagram. The logic can live in PHP or a simple rule engine inside the app; feel free to suggest the most reliable approach. Don't use any third-party platform APIs. Deliverables 1. Clean PHP codebase with d...

    $28 - $231
    Sealed
    $28 - $231
    24 bids

    I need a GoHighLevel specialist to implement a true multi-site data model using Custom Objects + Associations. This is specifically for Real Estate / Body Corporate / multi-property clients, where: One customer/contact must link to multiple Properties/Sites Each Property/Site must link to multiple Site Contacts (tenant, property manager, billing contact) Adding a new property must NOT create a duplicate customer/contact This project is ONLY for the multi-site / custom objects / associations part (not general GHL cleanup). Non-negotiable: NDA-safe proof BEFORE engagement Before I award any milestone or grant access, you must provide NDA-safe Loom or NDA-safe screenshots showing this working inside GoHighLevel: Settings → Custom Objects list page Properties/Sites custom object ...

    $65 / hr Average bid
    $65 / hr Avg Bid
    61 bids
    Next.js REST API Integration
    4 days left
    Verified

    I need my existing app wired up to an existing external REST API so it can securely fetch data, submit updates, handle authentication, and allow users to upload files. Most endpoints accept/return JSON, and uploads are sent as multipart/form-data — your code must handle both cleanly and reliably. Deliverables: A small, reusable, well-typed API client layer (e.g., /lib/api or similar) using fetch or Axios Authentication integration (bearer tokens / OAuth details provided). Requests should be signed correctly and handled consistently across the app Example usage: at least one working flow for: data retrieval data submission login/session handling file upload (multipart/form-data) Robust error handling (including loading + failure states) and a short README explaining patterns...

    $30 / hr Average bid
    $30 / hr Avg Bid
    275 bids

    The project covers two linked assets—a marketing website and an interactive web application—built as a single, cohesive code-base. Everything must be modern, fully responsive, and branded with a clean, intuitive UI/UX. Tech stack is already set: Angular on the frontend and a Node.js (Express) backend. Expect secure, stateless authentication (JWT or OAuth, whichever you judge best), role-based access, and a well-structured REST API that can later expand to GraphQL if needed. Data will live in either MySQL, PostgreSQL, or MongoDB; I’m open to whichever you recommend once requirements are refined. Core functionality • Public-facing pages for visitors • A logged-in web app with real-time notifications • Separate admin dashboard for user, content, and sett...

    $434 Average bid
    $434 Avg Bid
    28 bids

    I have a live mobile app that needs several quick fixes and small feature tweaks: • User notifications already appear correctly, but inside the notification settings screen I need an Add / Delete option so users can manage their own notices. • The Info button is presently inert. It must finally “Do” what it was meant to—react when tapped and complete its intended action rather than sitting idle. • In the admin area an unused “Donut” button slipped in during a previous update. Please remove it cleanly from both UI and code. • I want you to confirm whether a developer-level back door still exists. If any direct access remains, close it and leave only the standard, authorised paths. • Google sign-in is integrated but currently fails....

    $70 Average bid
    $70 Avg Bid
    10 bids

    I’m moving a full-stack Node.js / TypeScript application (Express API plus a React-Vite front end) from Replit into a secure, production-grade Google Cloud environment. Everything will be green-field, so you can design the layout cleanly without wrestling with legacy resources. Only the production tier is required. WHAT I NEED YOU TO BUILD • A GitHub-triggered Cloud Build pipeline that containerises the app, pushes to Artifact Registry, and rolls out to Cloud Run with zero-downtime updates. • Private Cloud SQL for PostgreSQL (Private IP via Private Service Access) reachable from Cloud Run through a Serverless VPC Access connector. • Secrets (DB creds, JWT keys, etc.) stored in Secret Manager and injected at runtime. • External HTTPS Load Balancer fronting...

    $654 Average bid
    $654 Avg Bid
    41 bids

    Social Media Posting & Campaign Management Application 1. Platform Integration • Native API integration with Facebook and Instagram. • OAuth 2.0 authentication for secure account connection. • Direct integration with each platform’s Advertising Management APIs. • API rate-limit handling and error management. 2. Multi-Platform Posting • Publish images, videos, and reels simultaneously. • Schedule posts for automated future publishing. • Queue-based execution for bulk posting. • Draft saving and approval workflow (team-ready). • Reusable post templates. • Centralized media library (image/video storage and reuse). 3. Campaign Management • Create and manage advertising campaigns from the application. • Full lifecycle control...

    $139 Average bid
    $139 Avg Bid
    22 bids

    Description: I need an experienced GoHighLevel (GHL) specialist to clean up and configure our GHL account so it is stable, consistent, and ready for a future VPS-hosted middleware integration with ServiceM8 and Gmail. This project is GHL configuration only (no VPS middleware build in this job). Scope / Deliverables Contact schema cleanup (critical) Remove/avoid conflicting phone fields (mobile/phone/landline handling must be clean) Business vs residential naming: support Customer/Company Name properly (not forced into first/last) Address handling: ensure Service Address and Billing Address are separate and never overwrite incorrectly Multi-site / Properties model (required) Implement or fix Custom Objects for multi-site (e.g., Properties/Sites) Associations: Contact ↔ Propert...

    $100 / hr Average bid
    $100 / hr Avg Bid
    43 bids

    I want a web platform that lets Murder Mystery 2 players stake their Roblox items in real-time games—coin flip, jackpot and an upgrader—modelled as closely as possible on the look, feel and flow of bloxybet.com. Coin Flip • Any number of coin-flip rooms can run in parallel. Players should be able to open a room, set the wager, share the link and wait for an opponent, or instantly join an open room. The interface needs the same fast, casino-style experience Bloxybet offers, with live status updates through WebSockets or a similar solution. Jackpot & Upgrader Both games must mirror Bloxybet’s mechanics: tier-based jackpot pools that roll on a timer, and an upgrader where players select an item, choose a percentage chance and see an animation revealing suc...

    $807 Average bid
    $807 Avg Bid
    88 bids

    I’m already using to talk with my clients; now I need those conversations to actually create, move, or cancel service appointments inside Square—and just as easily inside Stripe for the next business I onboard. I am not locked into - if you’ve got a better suggestion let me know why? Here’s what I need the finished solution to do: • Listen to Synthflow’s webhook calls, map the intent (book, reschedule, cancel, quote price) and any slot data, then hit the correct Square or Stripe Booking API endpoint. • Return a clear, conversational response that my agent can read back so the caller always knows what just happened. • Keep everything—API keys, service IDs, time-zone settings—in a single config file or environment block so I...

    $765 Average bid
    $765 Avg Bid
    145 bids

    ## Project Overview Seeking an experienced data engineer to integrate our complete Google marketing stack into Google BigQuery as a centralized data warehouse, with an AI-powered natural language query interface on top. ## Scope of Work **Phase 1: Data Integration to BigQuery** Connect and automate data pipelines from: - Google Analytics 4 (GA4) - Google Ads - Google Search Console - Google Tag Manager - Google Merchant Center Requirements: - Set up automated, near real-time data transfers - Design efficient BigQuery schema with proper data modeling - Implement ETL/ELT processes with data quality checks - Create unified views combining data across platforms - Import historical data - Document all data flows and transformation logic **Phase 2: AI Integration Layer** Implement AI-power...

    $335 Average bid
    Featured
    $335 Avg Bid
    44 bids
    Steam Sweepstakes Web App
    1 day left
    Verified

    I need a mobile-responsive web app that lets visitors sign in through the Steam API, automatically pulling their SteamID so they can enter free sweepstakes with a single click. The core build should feel snappy on phones first, then scale gracefully to desktop. Key flow • User arrives, taps “Sign in with Steam,” and is authenticated via OpenID. • Once logged in, the site tracks each entry they make, stores it under their account, and presents a simple profile page that shows only their sweepstakes history. Sweepstakes engine An automated job must close each giveaway at the scheduled time, randomly select a winner from valid entries, and fire off both an on-site and email (or Steam message if feasible) notification. I also want an admin view where I can start...

    $1214 Average bid
    $1214 Avg Bid
    234 bids

    I need a small-scale community-focused website that offers two sign-in options: Google OAuth (Gmail) and a classic email-and-password flow. The primary goal is community engagement, so once users are inside they must be able to create a profile, edit basic details, and exchange direct messages with each other. No e-commerce, no complex forums—just a clean, responsive space for members to connect. A lightweight tech stack is fine as long as it is secure and quick to deploy; React or Vue on the front end and Node, Django, or Laravel on the back end would all work if OAuth and secure password storage are implemented correctly. Mobile-friendly layout is required, and I’d like the initial build hosted on a standard cloud service (AWS, Heroku, Vercel, or similar) so I can test it li...

    $226 Average bid
    $226 Avg Bid
    64 bids

    We are looking for an experienced AI/Backend Engineer (or small team) to help design and implement a foundational setup for an enterprise “Agentic AI” goal is to enable a prompt-based interface where business users can ask questions and trigger actions across internal risk management and document systems through a governed API layer. This is NOT a chatbot UI project focuses on backend architecture, AI orchestration, and secure enterprise integration. Target application includes IBM OpenPages SaaS (GRC) accessed via REST APIs. The first phase will implement a proof-of-concept that allows an AI agent to retrieve and update structured records using approved APIs via a secure middleware service. Scope of Work (Phase-1: Foundational Setup) Build a secure middleware API servic...

    $159 Average bid
    $159 Avg Bid
    26 bids

    Plaid + Chase Connectivity Issue via API Plaid + Chase OAuth Integration — "Invalid Credentials" After Successful OAuth Flow The Problem: We have a production Plaid integration (Node.js/Express) that connects bank accounts via Plaid Link. American Express and Capital One connect and sync perfectly. Chase fails every time with "Username or password incorrect" AFTER the OAuth flow completes successfully. The Flow: 1. User clicks Connect Bank → Plaid Link opens 2. User selects Chase → Plaid fires OPEN_OAUTH event 3. User redirects to Chase's website and logs in successfully 4. Chase redirects back to our app with oauth_state_id 5. Plaid Link re-opens with receivedRedirectUri 6. Plaid shows "Username or password incorrect" — connectio...

    $57 / hr Average bid
    $57 / hr Avg Bid
    210 bids

    Quiero administrar desde mi panel de WordPress toda la operación que actualmente manejo en los marketplaces Riplay y Saga Falabella. El objetivo es una sincronización bidireccional completa entre ambas APIs y WooCommerce para que: • Inventarios se actualicen en tiempo real. • Pedidos fluyan en doble sentido: cuando entren en los marketplaces aparezcan como órdenes de WooCommerce y, si genero ventas propias, se reporten a Riplay y Saga. • Precios y cualquier otro dato comercial (SKU, status, descuentos) se mantengan coherentes en los tres sistemas. Busco una solución sólida que se instale como plugin o módulo personalizado, con: 1. Configuración sencilla de credenciales API y mapeo de campos. 2. Tareas programadas o we...

    $258 Average bid
    $258 Avg Bid
    60 bids

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