RESTful Jobs

I’m building a full-scale, multi-vendor store for physical products and need a from-scratch solution (strictly no WordPress or WooCommerce). The project breaks down into three tightly integrated areas: the customer-facing storefront, a seller dashboard, and a master admin panel. Seller panel essentials • Inventory management so each vendor can add, edit, and delist products in real time • Order tracking with shipment status and automated customer notifications • Sales analytics that show revenue, best-sellers, and payout history Payment handling • Credit/Debit card gateway (Stripe or similar) • PayPal • Direct bank transfer with automated reconciliation The codebase should be clean, scalable, and easy to extend—Laravel, Django, Node/...

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...

I am a Software Developer with over 7 years of hands-on experience in Java and AWS services, and I am excited to begin my freelancing journey on Upwork. Throughout my professional career, I have designed, developed, and maintained scalable, secure, and high-performance applications while ensuring reliability and cost-efficient cloud operations. My expertise includes core Java development, Spring-based applications, REST APIs, AWS services such as Lambda, ECS, DynamoDB, S3, CloudWatch, and Infrastructure as Code using Terraform. I focus on writing clean, maintainable code, delivering production-ready solutions, and resolving issues quickly to keep systems stable and secure. As I start my freelancing career, I am fully committed to delivering high-quality work, meeting deadlines consistent...

We are seeking an expert developer to integrate an ACH payment processor into our CRM system using the provided SOAP API. The ideal candidate will have extensive experience with SOAP APIs and a strong understanding of payment processing systems. You will be responsible for ensuring a seamless integration that allows for secure transactions and user-friendly functionality. Key Requirements: - Strong experience with SOAP API integration - Understanding of ACH payment processing and NACHA standards - Experience with JavaScript/Node.js - Knowledge of RESTful API development - Attention to detail and adherence to industry standards - Proven track record in similar payment integration projects This is a full-time hourly position. If you have relevant experience, we encourage you to apply.

I need a reliable bulk-SMS platform that lets me compose a message once, load thousands of numbers, and schedule exactly when every batch leaves the gateway. The core requirement is scheduling—think calendar-style controls or cron-like flexibility—so campaigns can be created days in advance and fire automatically, even if I’m logged out. Key functions I expect: • Upload or paste recipient lists (CSV, TXT, or manual entry). • Create, edit, and delete campaigns with a clear “send at” field. • Real-time status dashboard showing queued, sent, failed, and delivered counts. • Simple REST or HTTP API so my existing CRM can trigger sends. • Basic sender ID or shortcode handling in markets that allow it. I’m open on stack&mdas...

I need a versatile full-stack Java developer who can dedicate a full 8-hour shift aligned with Pacific Standard Time. The work revolves around a new enterprise platform we are rolling out internally, and I expect you to be comfortable owning both back-end Java code and the corresponding front-end layer. Scope of the build The application’s first release must cover three core capabilities: • User management • Data analytics • Workflow automation We will tackle these features in two-week Agile sprints, with planning, daily stand-ups, and sprint reviews held on my calendar in PST. You will demo working software at the end of every sprint so we can decide together what to refine next. Your day-to-day – Write clean, tested Java code and wire it to a modern fr...

I need a developer who can architect and code a fully RESTful CRM backend in Laravel. The core of the project is an API-first service that will: • Store and organise customer contact details, complete sales histories, and all communication logs. • Expose endpoints for customer data management, sales-pipeline tracking, and task management so the data can be consumed by future web or mobile front-ends. • Offer secure, scalable authentication (token or JWT) and role-based permissions. • Integrate directly with social media platforms—initially the major ones—so interactions and leads generated there can flow straight into the CRM. I expect well-structured Laravel code that follows PSR standards, clear naming, and thorough inline comments. Please include:...

End-to-end Developer experienced in crafting web and Android applications. I don't just write code; I design the entire ecosystem, including workflow logic, financial reporting modules, and user experience, ensuring every application is functional and business-ready

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...

I’m kicking off the development of a brand-new enterprise application and I want it built with the latest version of Angular from day one. The project starts with a clean slate, so you’ll have full control over the architecture, folder structure, and tooling choices. Two capabilities must be rock-solid: • User authentication – Single-sign-on, role-based access control, token refresh, and secure session handling are required. • Integration with other systems – REST and/or GraphQL endpoints, webhooks, and potential third-party SDKs will need to be wired in so data can flow smoothly across our existing platforms. Beyond those essentials, code quality, unit/integration test coverage, and straightforward CI/CD pipelines (GitHub Actions or similar) are expe...

I’m building and maintaining a series of backend services and I need an experienced Python developer who feels at home in FastAPI. The day-to-day work centres on designing clean, scalable REST endpoints, wiring them to a PostgreSQL database, and keeping the Dockerised environment tidy for smooth deployments. Most of the upcoming tasks involve integrating external providers: think payment gateways for transaction flow and AI/ML services that power in-app intelligence. Beyond those, you’ll help craft automation scripts, refine existing business logic, and keep an eye on performance as traffic grows. Here is what a typical assignment looks like: • create or extend a FastAPI micro-service • expose secure endpoints, including user auth where required • conne...

This project centres on replacing a monolithic, legacy insurance platform with a clean, high-performance .NET Core API designed around Domain-Driven Design. The first bounded contexts to rebuild are User Authentication & Authorization and Policy Management; Claims Processing may follow once the new foundation proves stable. The current system struggles with sluggish response times, can’t scale when new brokers come aboard, and is painful to extend or refactor. I therefore need an API layer that is fast, horizontally scalable and, above all, maintainable. No usable documentation exists, so part of the assignment is to reverse-engineer the relevant business rules directly from the running application and stakeholder interviews. You will model the core insurance domain into aggreg...