
Closed
Posted
Paid on delivery
Backend API Developer / Engineer – Ad Network Integration & Custom API Development Project Overview: We are looking for an experienced Backend Web & API Developer to refactor, replace, and build custom APIs for our website and mobile applications. The primary goal is to upgrade our current backend setup and integrate a dedicated API engine to manage, serve, and track advertisements efficiently without sacrificing app speed or performance. Scope of Work & Key Requirements Legacy API Replacement: Review existing endpoints, remove outdated code, and build high-performance replacement APIs. Custom Ad API Infrastructure: Build APIs to fetch, serve, and deliver ad formats (banners, native, video, etc.) seamlessly to both web and mobile platforms. Ad Analytics & Tracking: Create secure endpoints to track key ad metrics like impressions, click-through rates, and conversions in real-time. Speed & Latency Optimization: Utilize caching strategies (e.g., Redis) and slim JSON payloads to keep ad delivery fast and smooth. Security & Authentication: Secure all new endpoints using standard protocols (JWT, OAuth2, or API keys) and implement rate-limiting to prevent ad fraud. API Documentation: Provide clear API specs (Postman or Swagger/OpenAPI) so our front-end and app teams can easily integrate the new endpoints. Ideal Candidate Profile Deep expertise in building modern, scalable RESTful or GraphQL APIs. Strong background in backend languages (Node.js, Python, PHP/Laravel, Go, etc.). Prior experience with Ad Tech integrations, third-party ad networks, or custom ad-serving logic. Solid database knowledge (PostgreSQL, MySQL, or MongoDB).
Project ID: 40715321
77 proposals
Remote project
Active 23 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
77 freelancers are bidding on average ₹16,885 INR for this job

Hi, I’m an experienced Backend/API Developer and can help you refactor your existing backend, replace legacy endpoints, and build a scalable custom ad-serving API for your web and mobile applications. What I can deliver Review and replace outdated/legacy API endpoints with clean, high-performance REST APIs. Build ad-serving APIs supporting banner, native, video, and other required ad formats. Implement impression, click, conversion, and other ad-event tracking endpoints. Add Redis/database caching and optimized JSON responses to minimize latency. Implement secure authentication using JWT/API keys or OAuth2 as appropriate. Add rate limiting, validation, request logging, and other measures to reduce abuse and fraudulent traffic. Integrate third-party ad networks where required. Work with MySQL/PostgreSQL/MongoDB depending on your existing architecture. Development approach I would first review your current API architecture, database structure, ad-network requirements, and existing frontend/mobile integration points. From there, I can propose a clean API structure and migration strategy that minimizes disruption to your existing applications. I’m comfortable working with PHP/Laravel, Node.js, Python, JavaScript, MySQL, REST APIs, Redis, and third-party API integrations. I can start by reviewing your existing backend and API documentation/codebase and then provide a clear implementation plan with milestones. Looking forward to working with you Best regards ADEEL
₹7,000 INR in 7 days
8.1
8.1

Your project on replacing those legacy APIs and building a custom ad API infrastructure caught my eye. And the challenge of making sure low latency while implementing secure endpoints for ad metrics is critical, many overlook the importance of optimizing caching strategies with Redis, which can significantly impact performance, especially under high traffic. I’ll kind of focus on creating high-performance APIs that not only serve ads efficiently but also track analytics in real-time. Using JWT and OAuth2 for security, I'll make sure that all endpoints are secure and resistant to fraud. Clear API documentation will be provided to facilitate smooth integration with your front-end teams. I'm ready to get started on this right away, so just let me know when you want to move forward. Rajavel | Backend API Developer | Node.js | PHP/Laravel | Ad Tech
₹1,500 INR in 10 days
7.4
7.4

Hi, I have 10 years of experience developing scalable backend systems and REST APIs using Node.js, PHP/Laravel, MySQL, PostgreSQL and Redis. I can help replace the legacy API layer with a clean, high-performance backend designed for both web and mobile applications. I’d first audit the existing endpoints and data flow, then implement optimized APIs for banner, native and video ad delivery, along with secure impression, click and conversion tracking. Redis caching, lightweight JSON responses, database optimization and efficient query design will help keep latency low. I’ll also implement JWT/API-key authentication, rate limiting and validation to protect the platform and reduce fraudulent activity. The APIs will be documented through Swagger/OpenAPI or Postman collections so your frontend and mobile teams can integrate them easily. I can also handle third-party ad-network integration where required. I’d be happy to discuss your current API architecture and ad-serving workflow. Best regards
₹12,000 INR in 7 days
7.0
7.0

Hi, I can handle the API refactoring and build a dedicated, scalable ad-serving API layer for your web and mobile applications. I can work on: * Replacing and optimizing legacy APIs * Custom banner, native and video ad APIs * Impression, click and conversion tracking * Redis caching and optimized JSON responses for low latency * JWT/API-key authentication, rate limiting and secure endpoints * Database/API performance optimization * Swagger/OpenAPI or Postman documentation * Clean REST APIs ready for both web and mobile teams My preferred stack would be **Laravel/PHP or Node.js + PostgreSQL/MySQL + Redis**, depending on your existing codebase. I can first audit the current APIs and then migrate them without disrupting the existing application. I have strong experience with backend APIs, third-party integrations, authentication, databases and performance optimization. I can start with an audit of your existing API architecture and provide a clear implementation plan.
₹7,000 INR in 7 days
6.4
6.4

Hi I can refactor your existing backend APIs and build fast, secure ad-serving endpoints with tracking for impressions, clicks, and conversions. I have experience with REST APIs, Python/FastAPI, PostgreSQL, JWT authentication, rate limiting, and backend performance optimization. I’ll also provide Swagger/OpenAPI documentation for integration. Thanks Anshuman
₹9,000 INR in 7 days
6.4
6.4

Ad serving latency and click tracking require lightweight API endpoints decoupled from blocking database operations. I will rebuild your legacy endpoints, implement in-memory caching for ad selection, and secure metrics tracking against fraudulent floods. ✅ Develop high-throughput REST endpoints for ad serving and metrics ingestion with Redis-backed caching and slim JSON responses. ✅ Implement JWT/API key authentication, token-bucket rate limiting, and click-fraud filtering. ✅ Full DB/codebase backup and staging environment validation before live traffic migration, complete with Swagger/OpenAPI documentation. ✅ 10+ years production experience | 400+ completed projects | 320+ five-star reviews ✅ Microsoft® Certified: MCSA | MCSE | MCT & cPanel Certified (CWSA-2) What is your current peak requests-per-second volume, and what backend framework (Node.js, Laravel, or Python) is the existing service running on? I can deliver this in 1 day for 7675 INR and can jump on it right now.
₹7,675 INR in 1 day
5.9
5.9

Hello, I'm Karthik, a seasoned Backend API Developer with over 15 years of experience in building and optimizing scalable APIs, particularly in the Ad Tech domain. I understand your need for a robust integration and development of custom APIs to enhance your ad-serving capabilities. Scope of Work: 1. Legacy API Replacement: I'll assess and refactor current endpoints, ensuring high-performance replacements. 2. Custom Ad API Infrastructure: I will design APIs that efficiently manage various ad formats across web and mobile. 3. Ad Analytics & Tracking: I'll implement secure endpoints for real-time tracking of key metrics. 4. Speed Optimization: Utilizing caching strategies and optimized payloads, I will ensure swift ad delivery. 5. Security: All endpoints will be secured with JWT/OAuth2 and rate-limiting to mitigate fraud. 6. Documentation: Comprehensive API documentation will be provided for seamless integration. I have extensive experience with Node.js, Python, and various databases, making me an excellent fit for this project. Let’s discuss how I can help you achieve your goals efficiently. Looking forward to your response! Best, Karthik KarthikTechCon ₹59,944.45 INR
₹40,000 INR in 7 days
5.6
5.6

Your custom ad API needs two separate paths from day one: ultra-fast ad delivery for banners/native/video, and an asynchronous event pipeline for impressions, clicks, and conversions so analytics never slows the user-facing request. I’d use Node.js + NestJS, PostgreSQL, Redis caching, and a queue/event layer for tracking workloads, with slim REST responses and OpenAPI documentation. The two priorities would be scalability and integrations, especially around third-party ad networks, cache strategy, rate limiting, idempotent event ingestion, and fraud-resistant tracking. This keeps latency low on web/mobile while allowing reporting volume to scale independently. I can take ownership of auditing the legacy endpoints, replacing weak APIs incrementally, designing ad-serving rules, authentication, analytics schemas, Redis caching, background processing, monitoring, testing, and deployment. Existing APIs would not be rewritten blindly where stable code can be preserved. A relevant project is Lead Distribution App, where we replaced manual API-based lead movement with an automated platform for receiving, validating, routing, and bulk-delivering records between external vendors and clients, removing repeated manual API operations.
₹30,000 INR in 7 days
6.0
6.0

Hello, I can handle your backend refactoring and build the custom ad API infrastructure for your web and mobile applications. My approach involves reviewing and replacing legacy endpoints with high-performance replacements, setting up dedicated APIs to deliver various ad formats, and creating secure tracking endpoints for real-time analytics like impressions and click-through rates. I will implement caching strategies and slim payloads to maintain low latency, secure all endpoints with standard authentication and rate-limiting to prevent ad fraud, and provide complete documentation using a popular API spec tool. 1) Which programming language or backend framework is your current stack built on? 2) Do you have an existing database or data warehouse where ad metrics and analytics should be stored? Thanks, Bharat
₹11,000 INR in 7 days
5.1
5.1

As an experienced backend web and API developer, I've not only honed my skills in popular languages like Node.js, PHP/Laravel, Python, but I've also successfully worked on over 400 projects resembling yours. I find your project's objective stimulating as it demands meticulous and efficient ad network integration without compromising app performance. As such, my expertise in building modern, scalable RESTful and GraphQL APIs will come in handy to determine the most effective API engine for your particular needs. Lastly, one of the elements that set me apart from others is my ability to provide unrivaled end-to-end services covering diverse industries just like yours. My dedicated solutions include comprehensive API documentation to ease the integration for other teams. To survive and grow in this fast-moving digital world a flexible base is necessary and that's what my tailored designs promise: innovative solutions that can adapt to any business need. Advocating for client satisfaction at all costs, I eagerly await working on this exciting project together.
₹12,500 INR in 7 days
5.1
5.1

Your backend needs to do more than replace legacy endpoints; ad delivery, tracking, security, and latency all need to be designed together so web and mobile performance remain stable. I have 8+ years of full-stack and backend experience with Node.js, Python, PHP, REST APIs, PostgreSQL/MySQL, authentication, caching, background processing, and production integrations. I’d begin by auditing the existing API surface, then replace outdated endpoints with a modular ad-serving layer for banners, native, and video formats. The implementation would include impression/click/conversion tracking, Redis caching, rate limiting, secure authentication, optimized payloads, database indexing, and Swagger/OpenAPI documentation for your frontend teams. I can also structure the system so additional ad networks can be integrated without rebuilding the core API.
₹23,000 INR in 20 days
4.6
4.6

With over a half-decade of expertise in developing robust and scalable RESTful and GraphQL APIs, I am confident in my ability to refactor, replace, and build the custom APIs your project needs. I’m well-versed in backend languages including Node.js, Python, PHP/Laravel; and relational databases such as PostgreSQL and MySQL – all of which make me an ideal candidate for the job. What sets me apart is not just my technical skillset but my understanding of your domain. I have previously worked on Ad Tech integrations and custom ad-serving logic which provides me with unique insights to handle this project seamlessly. I've also successfully implemented speed and latency optimization strategies - which aligns perfectly with your requirements. My focus on secure authentication using standard protocols like JWT, OAuth2 or API keys is what your project deserves to prevent ad fraud. Lastly, from my experience successfully completing 40+ production deployments; developing automation systems, full-stack platforms, AI agents that are in operations raking in real value for their companies, demonstrate how I'm a results-oriented professional who takes ownership of the projects I undertake. With clean documentation and fast turnarounds being qualities for which I'm known lets discuss your project with a goal to elevate your customer experience and eliminate financial losses caused by archaic infrastructure.
₹7,000 INR in 1 day
4.8
4.8

Hi Mate , Good afternoon! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in RESTful, PHP, MySQL, Backend Development, API Development, Node.js, Python, JavaScript and HTML5. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Eager to hear your feedback
₹7,770 INR in 2 days
4.2
4.2

Hi, I have 10+ years of experience in PHP, Laravel, REST APIs, JavaScript, MySQL, and third-party API integration. I can develop and integrate the required network APIs with secure authentication, request/response handling, data synchronization, error handling, logging, and reliable database integration. I’ll ensure the APIs are well-structured, documented, secure, and tested thoroughly across different scenarios. I’m ready to start immediately.
₹3,000 INR in 4 days
4.2
4.2

Hi there, An ad API has to be fast enough for the user experience while remaining reliable enough to produce trustworthy tracking data. I can work across the existing backend to replace legacy endpoints and build a clean API layer that both your website and mobile apps can consume consistently. I’d begin with an endpoint and data-flow audit, identifying what can be preserved and what should be replaced. The new architecture can use Node.js/Python/Laravel with PostgreSQL/MySQL, Redis caching and compact response payloads, with ad-serving logic separated from analytics and business rules. Impression, click and conversion tracking would include validation, idempotency and rate limits to reduce duplicate or abusive events. Authentication, authorization and API security would be built into the endpoints, with Swagger/OpenAPI or Postman documentation for the integration teams. I’ll also benchmark critical endpoints and test failure, load and tracking scenarios before deployment. Share the existing API documentation/repository and ad-network requirements, and I’ll start with the endpoint audit and proposed API architecture. Best, Gurmeet
₹6,000 INR in 5 days
4.0
4.0

As an experienced backend web developer, I am highly competent in the core requirements of your project. Offering skills in HTML5 and Node.js, I am particularly adept at creating modern, scalable, and high-performance API solutions. With a solid background in databases like PostgreSQL, MySQL, and MongoDB, your ad tracking and analytics requirements will be handled expertly. Moreover, my 6+ years in the design and branding industry have nurtured my ability to create secure endpoints with exceptional UI/UX. Adhering to standard protocols like JWT, OAuth2, or API keys for top-grade security with rate-limiting to combat ad fraud will be second nature to me. In addition, I can provide detailed API specifications using platforms such as Postman or Swagger/OpenAPI for easy integration with your front-end and app teams.
₹1,500 INR in 3 days
3.7
3.7

You need to replace legacy backend endpoints with a dedicated API layer that can serve ads to web and mobile clients while handling real-time tracking, security, caching, and low-latency delivery. I have strong Python, Node.js, REST API, PostgreSQL, MongoDB, Redis, and AWS experience. At Marin Software, I worked on Python-based serverless systems and real-time data pipelines, while at Poundit I worked with Django and Node-based production backends, APIs, and transaction workflows. I can use that experience to refactor existing endpoints, design clean REST APIs, implement banner/native/video ad delivery logic, and build impression, click, and conversion tracking. I would use JWT or API keys where appropriate, rate limiting, Redis caching, compact JSON responses, PostgreSQL for structured analytics data, and Swagger/OpenAPI documentation. I would also profile the existing API before changes so performance improvements are measured rather than assumed.
₹8,000 INR in 2 days
3.1
3.1

Hi, I can rebuild and optimize your backend API layer into a fast, scalable ad-serving infrastructure designed for both web and mobile applications. I have 3+ years of full-stack development experience and currently work as Co-founder of Zipply, where I build production SaaS platforms involving REST APIs, authentication, analytics, automation, databases and high-performance backend workflows. For your project, I will first audit the existing APIs and identify legacy endpoints, bottlenecks and dependencies. I’ll then replace them with clean, modular APIs for banner, native and video ad delivery. The implementation will cover ad request/response logic, impression and click tracking, conversion events, campaign/ad placement handling, Redis caching, optimized JSON payloads and database indexing. I’ll also implement JWT/API-key authentication, rate limiting, validation and safeguards against duplicate or suspicious tracking events. I can work with Node.js/TypeScript, PostgreSQL and Redis, while integrating your existing or third-party ad networks without disrupting current web/mobile clients. You’ll receive: • Refactored and documented backend APIs • High-speed ad serving and tracking engine • Analytics-ready event architecture • Security and rate limiting • Swagger/OpenAPI or Postman documentation • Integration support and deployment assistance • Clean, maintainable source code
₹6,000 INR in 7 days
3.1
3.1

Your spec puts rate-limiting under anti-fraud, and that is the one place it will not hold. An impression or click endpoint that simply accepts a POST gets inflated - by bots, and by publishers padding their own numbers. Rate limiting slows that down, it does not stop it, because the requests look legitimate. What works: issue a signed single-use token with each ad payload and have the tracking endpoint validate it server-side. A click is then countable once, and only against an ad that was genuinely served. Second point, and it bites early: Redis caching and per-user ad targeting pull against each other. If the response is personalised you cannot cache it - you cache the candidate set and run selection at request time. Cache the final payload and you will serve user A's ads to user B. On the legacy replacement I would freeze the current endpoint contracts first and rebuild behind them, so your web and app teams are never blocked waiting on the new ones. Straight about experience: I have not done ad-network integrations specifically. Backend APIs, caching and auth, yes. Live reference: edtechvibe.com. Happy to start with the ad-serving and tracking endpoints as a paid first phase so you judge real code. - Aakaash
₹10,000 INR in 4 days
3.3
3.3

Hi, I can refactor your existing backend and build a dedicated, scalable API layer for both web and mobile ad delivery, with a strong focus on latency, security, and accurate tracking. I’ll handle: * Audit and replacement of legacy/outdated endpoints * RESTful APIs for banner, native, video, and other ad formats * Real-time impression, click, conversion, and campaign tracking * Redis caching, optimized queries, pagination, and lightweight JSON payloads * Secure authentication using JWT/API keys or OAuth2 as appropriate * Rate limiting, validation, abuse/fraud controls, and secure logging * PostgreSQL/MySQL/MongoDB integration * Third-party ad-network integration where required * Swagger/OpenAPI documentation and Postman collections * Clean, modular code with deployment and integration documentation I can work with Node.js/Express or NestJS, Python, Laravel, or another backend stack already used by your project. I’ll first map the existing API contracts so the replacement can be introduced without unnecessarily disrupting the current web/mobile applications. One key question: do you already have a specific ad network/provider to integrate, or should the custom API also include its own campaign, targeting, and ad-serving logic?
₹1,500 INR in 1 day
2.8
2.8

Prayagraj, India
Member since Sep 16, 2026
₹600-1500 INR
₹37500-75000 INR
$250-500 AUD
$10-30 USD
$15-25 USD / hour
$30-250 USD
€30-250 EUR
$30-250 USD
$10-30 USD
$250-750 USD
₹1500-12500 INR
$2-8 USD / hour
₹600-1500 INR
€30-250 EUR
$30-250 USD
$750-1500 USD
₹1500-12500 INR
$10-30 USD
₹12500-37500 INR
₹1500-12500 INR