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!

Sur 18,466 commentaires, les clients ont évalué nos OAuth Developers 4.9 sur 5 étoiles.
Embaucher des 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!

Sur 18,466 commentaires, les clients ont évalué nos OAuth Developers 4.9 sur 5 étoiles.
Embaucher des OAuth Developers

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    17 missions trouvées

    I run a CRM that was built entirely on Bubble and now needs a focused round of improvements. My immediate priority is the payment system: I want a one time subscription option configured end-to-end, keeping the door open for monthly, quarterly or annual plans and a free-trial mechanic that I can switch on later. This includes product setup, workflow tweaks, invoicing logic and whatever Stripe or Braintree hooks are required inside Bubble. In parallel, every task created in the CRM has to appear automatically in Google Calendar for the assigned user. I already have a Google account ready; what I need from you is the full OAuth handshake, event-creation workflow and a way to keep edits in sync both ways so users always see the latest due date. Finally, a handful of buttons and on-screen ac...

    €23 Average bid
    €23 Offre moyenne
    24 offres

    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...

    €130 Average bid
    €130 Offre moyenne
    45 offres

    I’m rolling out a product that runs simultaneously on the web, iOS and Android, and I need a clean, unified way to handle user entry and keep everyone informed in real time. Authentication scope • Support OAuth flows (Google, Apple, etc.) • Maintain JWT-based sessions for our own username/password route • Offer social-media sign-ins side-by-side, all funnelling into a single user table Notification scope • Email messages for transactional events • Push alerts on the mobile apps • SMS for time-sensitive updates Deliverables 1. Reusable modules or SDK integrations for each platform 2. Secure backend endpoints (or rules) that issue and verify tokens 3. Trigger logic that selects the correct channel—email, push or SMS—based o...

    €13 Average bid
    €13 Offre moyenne
    13 offres

    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...

    €78 Average bid
    €78 Offre moyenne
    21 offres

    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...

    €29 / hr Average bid
    €29 / hr Offre moyenne
    211 offres

    ## Project Overview We are developing a mobile application integrated with a Shopify embedded app and a web-based admin dashboard. We are looking for an experienced **full-stack developer (or team)** and a **UI/UX designer** to support development from wireframing to deployment. This is an MVP with potential for long-term collaboration and feature expansion. --- ## Required Technical Skill Set ### Backend Development * Strong experience with **Node.js / Python / PHP** (flexible stack) * RESTful API development * OAuth and authentication flows (JWT, token-based auth) * Webhook handling * Cloud-based architecture * Database design (Postgres / MongoDB / Firebase or equivalent) * File storage integration (AWS S3 or similar) * Scalable SaaS architecture planning --- ### Mobile Development * ...

    €18 / hr Average bid
    €18 / hr Offre moyenne
    190 offres

    I’m building a B2B platform that now has to expose a well-structured REST API so other services can hook in without friction. The immediate priority is to wire my software to a range of external providers—including SMS / Voice APIs, social-media feeds, data-enrichment sources, single-sign-on, scheduling tools and some AI/ML services—while keeping the interface consistent for our own clients. Here is how I picture the job: • Design clean, versioned REST endpoints that sit on top of our existing stack (Node + Postgres) and follow standard verbs and status codes. • Build the integration layer for each third-party service. I need graceful handling of auth flows (OAuth2, JWT, API keys), rate-limits and retries, plus a simple way to toggle providers on or off. &bu...

    €24 Average bid
    €24 Offre moyenne
    21 offres

    I need a senior React developer who already feels at home inside the Shopify ecosystem to build a custom embedded app dedicated to product management. The first release will concentrate on two pain points in my current workflow: • Accurate, real-time inventory tracking across all locations • Fast, reliable creation and maintenance of product variants You’ll work with React (ideally TypeScript), Shopify App Bridge, Polaris, and the Admin GraphQL API to deliver an app that lives inside the Shopify admin, authenticates through OAuth, and feels 100 % native. Clear, maintainable code, semantic commits, and component-level testing are expected. Deliverables • A working embedded app installed on my development store • Reusable React components for inventory an...

    €16 / hr Average bid
    €16 / hr Offre moyenne
    170 offres

    Title Microsoft Outlook / Graph API Developer for AI-Assisted Email Drafting Tool Description I am building a private productivity application that integrates with Microsoft 365 and uses modern language models to assist in generating email drafts. I’m looking for an experienced developer who can help design and implement an MVP with the following capabilities: • Authenticate users with Microsoft 365 • Access mail folders via Microsoft Graph • Retrieve email metadata (participants, dates, subjects, thread IDs) within user-defined folders and date ranges • Aggregate communications by contact • Provide structured context to an LLM • Create draft messages and save them to the user’s Outlook Drafts folder • Support insertion of deterministic c...

    €1264 - €2528
    Scellé LDN
    €1264 - €2528
    68 offres

    Please read carefully for full consideration DO NOT POST QUESTIONS TO BOARD THEY WILL BE IGNORED There is a technical document if you would like consideration please fill out document alon with your bid this is not a crypto bot and i am not seeking a feature builder Senior Broker Execution Engineer – Full Automation Hardening & System Cohesion – Cash-Only Options Engine I am completing a nearly finished Python-based automated options trading system. Strategy logic is complete. This engagement is not about alpha or indicator development. This is systems engineering, execution safety, wiring integrity, and production reliability. System Context Per current architecture: Schwab Trader API OAuth implemented Token server active Cash account only Single-leg equity...

    €752 Average bid
    €752 Offre moyenne
    164 offres

    We are building a recruitment website using Base44 (no-code/low-code platform) and need to integrate it bidirectionally with JobAdder CRM via their REST tasks: Set up OAuth2 Authorisation Code flow authentication (mandatory – JobAdder API requires this; developers must have proven experience). Pull active job listings from JobAdder (GET /jobs endpoints) and display them dynamically on the website (e.g., searchable job board). Handle candidate application submissions from website forms: Create candidates (POST /candidates), attach resumes, and link applications (POST /jobapplications). Use Base44's workspace integrations (prefer OpenAPI spec import if possible) or backend functions for API calls. Ensure clean, secure implementation with error handling, token refresh,...

    €93 Average bid
    €93 Offre moyenne
    72 offres

    Full-Stack iOS Engineer (Swift/SwiftUI) — Build LoveLink AI’s Next-Gen Social App LoveLink AI is building a next-generation social networking app for iOS, designed to make connecting feel effortless, modern, and genuinely fun. We’re looking for a full-stack Swift engineer who can take ownership of the product build—from prototype through App Store launch. This role is ideal for someone who’s shipped real consumer apps, thrives in early-stage environments, and can move quickly while keeping architecture clean and scalable. Location: Remote (US Based Preferred or US Hours if Overseas) Engagement: Contract (hourly or milestone-based) Start: ASAP Stage: Prototype → MVP → Launch Meetings: MS Teams What You’ll Build The mission is simple: deliver a s...

    €2101 Average bid
    €2101 Offre moyenne
    107 offres

    Overview: We’re looking for an experienced SuiteCRM developer/designer to help us customise a new SuiteCRM 8.9 installation for our sales team. The goal is to create a modern, user-friendly CRM interface that matches our visual designs and delivers a smooth, efficient experience similar to and Zoho CRM. Key Objectives: • Install SuiteCRM 8.9 on our web server (latest version). • Build a custom SuiteCRM theme (no prebuilt themes) to match our provided designs. • Streamline the sales process: intuitive in-line edits, pop-up windows, quick lead management that matches the visual styling of and Zoho CRM. • Develop and refine multiple modules • Integrate with Google Calendar (2-way), email sync, and lead enrichment APIs (, Apollo, , etc.). • Implement dupl...

    €263 Average bid
    €263 Offre moyenne
    36 offres

    I have a working prototype built in Google AI Studio and I now need to take it from “demo” to a secure, production-ready release on both web and Android. First, I want every credential locked down. Both the API keys and the code itself must be protected: secrets moved to environment variables or Secret Manager, no keys exposed in the client bundle, and the repository cleaned of sensitive commits. A brief security checklist or automated scan that proves the hardening is complete will form part of the hand-off. Next comes a functionality sweep. I’m not sure whether anyone has formally reviewed the code, so plan to step through each user flow, patch breakages, and make sure the app genuinely meets Minimum Viable Product standards. User sign-in must switch to Google Authen...

    €114 Average bid
    €114 Offre moyenne
    128 offres

    I need our existing SaaS booking manager to tap directly into Google’s ecosystem so every customer who signs up can: • connect their Google Calendar, see real-time availability inside our scheduler, and let us push confirmed bookings back to their calendar; • send, receive, and log email through Gmail without ever leaving our app; • rely on a clean, well-documented custom API layer that we can extend to other Google services later. The sign-in step is already handled; what’s missing is the deep, token-based access to Calendar, Gmail, and any other Google endpoints we decide to expose. Your job is to build those flows end-to-end, handle refresh-token management, and return the data in a format our front-end can consume (React + ). Our back-end runs on Node (...

    €25 Average bid
    €25 Offre moyenne
    53 offres

    My Shopify store sells digital, downloadable religious artwork and I already set up a Google Marketplace (Merchant Center) account so I can start advertising. The snag is at the very first step: when I connect the Google Marketplace sales channel inside Shopify I get an “authentication failed” message and the process stops. I have not yet used any of the official troubleshooting guides from either platform, and the store is running on a clean theme with no custom code or third-party apps installed, so the cause should be straightforward. I can provide the exact wording of the error and full access to the Google Merchant Center and Shopify admin as soon as we begin. What I need from you: • Identify the root cause of the authentication failure and apply the fix insid...

    €29 Average bid
    €29 Offre moyenne
    58 offres
    Fix Azure-Bing Ads Auth
    3 jours left
    Vérifié

    I need someone who has already integrated a SaaS platform with Microsoft Advertising (Bing Ads) through an Azure-registered application and can jump straight into resolving our authentication roadblock. The situation • The Azure AD app exists and should be correctly configured, yet our calls to the Bing Ads API fail at the auth step. • We are using standard OAuth2 flows and the Microsoft Advertising SDK, but tokens are not being accepted downstream. • All tenant-level permissions that look relevant have been granted, so I suspect a subtle setting, scope, or consent mismatch rather than a coding bug. What I’d like from you 1. Review the current Azure AD app registration, API permissions, and redirect settings. 2. Trace the exact OAuth handshake (request, con...

    €32 Average bid
    €32 Offre moyenne
    39 offres

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