Senior Full-Stack Developer for Global SaaS Platform

@diektech

Hi — Elias here from Miami. I see you’re building a global SaaS platform for Worldwide Black Car, which has great potential for optimizing transportation services. Reliability and scalability are critical in this context. The real challenge often revolves around managing complex integrations and ensuring the system can handle an increasing user base without performance issues. What usually matters most is establishing a solid architecture that supports both current needs and future growth. My approach would focus on creating a modular system using Django and FastAPI for the backend, ensuring components can be independently managed and scaled. Using PostgreSQL for data storage will help maintain data integrity while allowing for efficient queries. Stability is key, so I'll prioritize robust testing and CI/CD practices. I’ve worked on similar SaaS applications where I streamlined workflows and enhanced user roles, positioning the platforms for successful scaling and feature expansion. A few questions to better understand the scope: Q1 – What user roles and permissions do you envision for the platform? Q2 – Are there specific third-party integrations you anticipate needing? Q3 – What are your expectations regarding scalability and user load in the next year? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.

@ZohaibRoy

⭐⭐⭐⭐⭐ Create a Global SaaS Platform for Chauffeured Transportation ❇️ Hi My Friend, I hope you are doing well. I've reviewed your project requirements and see you are looking for a Senior Full-Stack Developer. You don’t need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for SaaS platforms. I will focus on building microservices and integrating AI services effectively within your budget. ➡️ Why Me? I bring over 5 years of experience in full-stack development, specializing in TypeScript, FastAPI, and React. My expertise includes building scalable applications and integrating payment systems like Stripe Connect. Additionally, I have a strong grip on technologies like Docker, AWS, and PostgreSQL, ensuring a solid approach to your project. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I look forward to discussing this with you in chat. ➡️ Skills & Experience: ✅ TypeScript ✅ FastAPI ✅ React ✅ Python ✅ PostgreSQL ✅ Docker ✅ AWS ✅ Kafka ✅ Redis ✅ Stripe Connect ✅ Twilio ✅ Firebase FCM Waiting for your response! Best Regards, Zohaib

@infowider11

⭐️⭐️⭐️ Senior Full-Stack Developer | SaaS, Mobility & AI Platforms ⭐️⭐️⭐️⭐️ Hello, How are you? I have reviewed your requirements and understand that Worldwide Black Car is a large-scale transportation SaaS platform requiring expertise across microservices, AI integrations, mobile applications, dispatch systems, payments, and cloud infrastructure. The focus is on building a scalable, production-ready ecosystem for licensed chauffeur and black-car operations. Features: ✔ Microservices Architecture ✔ AI Service Integration ✔ React Native iOS & Android Apps ✔ React Web Applications ✔ Fastify & FastAPI Development ✔ PostgreSQL & Row-Level Security ✔ Kafka & Redis ✔ Docker & Kubernetes ✔ AWS Infrastructure ✔ Stripe Connect Split Payouts ✔ Twilio & SendGrid Integration ✔ Firebase Push Notifications ✔ Dispatch & Booking Systems ✔ Real-Time Tracking & Notifications Let’s chat… Thanks

@irsolutions

With over a decade of experience in full-stack architecture and high-scale systems, I understand your need for a Senior Full-Stack Developer to help build the Worldwide Black Car global SaaS platform for licensed chauffeured transportation. My background in scaling projects for over 1 million users and expertise in high-security FinTech align directly with the challenges of developing a platform with 20 microservices, 10 AI services, and a proprietary Ride Alert dispatch system. One strategic insight I can offer is to utilize row-level security in PostgreSQL to ensure data protection while leveraging Fastify and FastAPI for efficient backend development. In a past project, I successfully built and scaled Telegram Mini Apps serving over 1 million users, showcasing my ability to handle the complexity of a project like Worldwide Black Car. I encourage you to reach out so we can discuss the roadmap for your project. I am confident in my ability to contribute to the success of the Worldwide Black Car platform and look forward to the opportunity to collaborate.

@skalogir

Hello, I hope you're doing well! I understand you are building Worldwide Black Car, a large-scale SaaS platform for the chauffeured transportation industry featuring microservices, AI services, mobile and web applications, ride dispatching, Stripe Connect payouts, and cloud-native infrastructure on AWS. I have extensive experience delivering production-grade full-stack platforms using TypeScript, Fastify, Python, FastAPI, React, PostgreSQL, Redis, Docker, Kubernetes, and Stripe integrations, with a strong focus on scalable, service-oriented architectures. I will extend the existing platform through a structured microservices approach, prioritizing core dispatch, payment, notification, and operational workflows while ensuring reliability, security, scalability, and seamless integration across all services. Q1: Which components of the platform are already completed, and which modules remain in active development? Q2: Do you have finalized requirements and architecture diagrams for the Ride Alert dispatch system and AI services? Q3: What is your target launch timeline, and are you expecting a single fixed-price proposal for the entire platform or milestone-based delivery? Looking forward to discussing the project and contributing to the successful delivery of Worldwide Black Car.

@corpmember29

HELLO, I have carefully reviewed your requirements for the Worldwide Black Car SaaS platform and understand that this is a large-scale, production-grade distributed system involving microservices, AI services, real-time dispatch logic, and multi-frontend applications. With 10+ years of experience in full-stack architecture and scalable SaaS systems, I have worked on complex platforms involving TypeScript/Node.js backends, Python FastAPI services, PostgreSQL with advanced role/row-level security, and cloud-native deployments using Docker-based infrastructure. I also have experience integrating payment systems such as Stripe Connect (including split payouts, multi-vendor flows, and marketplace billing), along with real-time messaging systems and event-driven architectures. I understand the complexity of your architecture (20 microservices + AI services + multi-app ecosystem) and the importance of building a stable foundation for dispatch logic, ride state synchronization, and real-time communication between riders, drivers, and admin systems. My approach would focus on designing a clean service-oriented architecture using Fastify and FastAPI microservices, Kafka for event streaming, Redis for low-latency state management, and Kubernetes-based orchestration on AWS for scalability and resilience. The frontend layer would be handled using React and React Native for cross-platform consistency across iOS, Android, and web dashboards.

@DeveloperStation

Hi there, We’ve built a similar product called Concio, where we developed a web app and mobile apps for drivers and riders, integrating Stripe for payments and using AI for ride optimization. We also have extensive experience with AWS, Docker, and CI/CD pipelines, ensuring that we can deliver a fully optimized product. As a team of 10 developers, we can provide dedicated resources for front-end, back-end, and mobile development, allowing us to work in parallel and deliver faster. We also have dedicated QA engineers to ensure that every feature is thoroughly tested. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. I’m looking forward to hearing more about this exciting project. Best, Adil

@mubeenm5026

With the complexity and specificity of your project, deciding on a developer with deep understanding and practical experience with the platforms and technologies needed is vital, and I'm glad you're considering me for it. As the founder and CEO of Web Crest, I've built a solid 10-year reputation on the back of my team's proficiency in exactly such domains. When it comes to building complex SaaS platforms or running multiple microservices that interoperate seamlessly across platforms, including Firestore, Kubernetes, AWS and Docker among others, few come with my level of expertise. It's not only a matter of technical know-how, but also of familiarity with ride-hailing operations; my accumulated experience gives me intimate understanding of black car, limousine services and chauffeuring. My earlier experience working with Stripe Connect will allow ensure efficient split payouts on your platform while I am also well stocked in my knowledge of integrating Twilio, SendGrid and Firebase FCM functionalities on various projects. The web apps developed using React Native for both Android and iOS platforms have been received tremendously well by clients in terms of usability and performance. In short, my team brings together a fine combination of technical skill, project management expertise and industry-specific knowledge that makes us best-suited candidates for this giant undertaking.

@visionvivante

Hello, I can contribute to the development of Worldwide Black Car's platform across both backend and frontend systems. I have experience building scalable applications using TypeScript, React, Node.js/Fastify, Python/FastAPI, PostgreSQL, Redis, Docker, and AWS-based infrastructure. I'm comfortable working within microservice architectures, integrating third-party services such as Stripe, Twilio, Firebase, and SendGrid, and developing production-ready APIs and user-facing applications. I also have experience implementing payment workflows, including marketplace and multi-party payment systems, subscription billing, webhook handling, and payout automation. My focus is on writing maintainable, well-tested code while ensuring performance, security, and scalability across the platform. Before proceeding, I'd like to confirm: are you looking for a developer to own specific microservices and features within the existing architecture, or are you seeking someone to help drive end-to-end development across backend services, mobile apps, and web applications? Please open a chat so I can review the full specification and discuss timeline, scope, and fixed-price estimation in detail. Best regards, Vision

@iosifpeterfi

Hello, I'm Iosif, a senior full-stack engineer building large-scale SaaS platforms, microservice ecosystems, and cloud-native applications using FastAPI, Python, TypeScript, PostgreSQL, AWS, Docker, Kubernetes, and event-driven architectures. WBC is the type of platform where architecture matters more than features. With 20 microservices, AI services, mobile apps, dispatch workflows, and payments, success depends on reliable service boundaries and scalable infrastructure. Relevant experience: • FastAPI and TypeScript backend services • PostgreSQL with row-level security and multi-tenant architectures • AWS, Kubernetes orchestration, Docker • Redis, Kafka, event-driven systems • Stripe Connect marketplace and payout workflows • React and React Native applications • Real-time dispatching and workflow automation I can contribute immediately to: • Microservice design and implementation • Dispatch and booking workflows • Stripe Connect payout architecture • API gateway and service integration • Database performance and security optimization • Infrastructure automation and CI/CD pipelines Technical focus: • Scalable service-oriented architecture • Secure financial transaction processing • High-availability deployment strategies • Real-time messaging and event processing I'd like to review the full specification and discuss which platform components are highest priority for the initial delivery phase. Best regards, Iosif Peterfi

@andrijaar2

Hello, I have worked on a very similar project where the goal was handling finished rides and fixing parking overlaps. As we have finished that project I can help you find possible future problems and develop a fully working solution. I have the most experience with NextJS (React), .NET and PostgreSQL/Firebase (based on use-case), and I assure you this project will be built from scratch and will be architected by an experienced team. Feel free to contact me so we can start as soon as possible! Regard, Andrija

@johnallenvillan1

Hello, I noticed your focus on a platform built from 20 microservices, 10 AI services, and a proprietary Ride Alert dispatch layer, which tells me you need someone who can navigate distributed systems without hand‑holding. I've delivered a similar multi‑service ride‑hailing stack before, including a Stripe Connect split‑payout rollout that reduced payout delays by over 70% and a Kafka‑driven dispatch module that stabilized high‑load routing. The real complexity here isn’t just the stack, it’s the orchestration. Coordinating FastAPI/Fastify services, keeping PostgreSQL RLS rules coherent across domains, and ensuring AWS‑based microservices don’t drift in behavior is where most projects fail. Your mix of React Native apps, web portals, and AI components requires strict contract boundaries and predictable async communication. I’ll map service responsibilities, align event schemas for Kafka, implement RLS‑compatible data flows, and containerize each unit cleanly for Kubernetes. I’ll also validate Ride Alert integration points and ensure Stripe Connect flows match your operational rules. Before starting, I need clarity on the current CI/CD pipeline, the state of your specification, and whether any legacy code must be absorbed. I can begin immediately and structure delivery in phased milestones. Thanks, John allen.

@nickyjohnl

Hello, I have 10+ years of experience delivering large-scale SaaS platforms using TypeScript, Fastify, Python, FastAPI, React, PostgreSQL, Kafka, Redis, Docker, Kubernetes, and AWS. I have built and maintained production systems with microservice architectures, real-time dispatch workflows, payment orchestration, notification services, role-based security, and high-volume API integrations, including Stripe Connect split payouts, Twilio communications, Firebase push notifications, and complex operational dashboards. I have worked on transportation and logistics platforms involving driver management, trip dispatching, live tracking, fleet operations, booking systems, pricing engines, and automated notification workflows, which aligns closely with the Worldwide Black Car ecosystem. For your project, I can contribute across backend services, frontend applications, AI service integration, platform scalability, security, and production deployment while maintaining clean architecture and long-term maintainability across the entire ecosystem. The attached specification would help determine an accurate timeline and fixed-price estimate, but I am comfortable working within a structured milestone-based delivery model for a platform of this scale. My background includes designing systems that support multi-tenant operations, real-time events, payment settlement workflows, and enterprise-grade reliability requirements. Best regards.

@rahuliitm69

Hi there, With over a decade of experience developing and delivering enterprise-level applications, I confidently position myself as a highly qualified Senior Full-Stack Developer for your World-wide Black Car (WBC) project. I am well-versed in TypeScript, Fastify, Python, FastAPI, React Native iOS and Android, React web- the exact tech stack you demand. Your project entails 20 microservices, 10 AI services along with 6 frontend apps and Row-Level Security (RLS) in PostgreSQL which I consider my stronghold given that I have utilized the same extensively in my projects. Above all, what makes me stand out for this venture is my prior experience in offering technology to black car and ride-hailing services. As an engineer who has built various transport-centered platforms before, including route optimization systems for fleet management and ride-sharing applications, I understand the criticalities of performance efficiency and scalability. My recent experience in Stripe Connect will enable me to exceed your expectations by assuring a seamless split payout system to enhance your booking and transaction management ease on WBC. I am confident about matching both minute technical specifications as well as the unique transportation layer for Worldwide Black Car. Let's kick-start this ride down the WBC road together! Thanks, Rahul A.

@reedsystems

Hi, I’m excited to bid on the Senior Full-Stack Developer position for Worldwide Black Car’s SaaS platform. With over a decade of experience in full-stack development and a strong background in building complex, high-performance systems, I'm well-suited to take on this challenging project. Key highlights: - Proficient in TypeScript, Fastify, Python, FastAPI, React Native for iOS/Android, and React web - Experienced with PostgreSQL row-level security, Kafka, Redis, Docker, Kubernetes, and AWS - Skilled in implementing Stripe Connect split payouts, integrating Twilio, SendGrid, and Firebase FCM - 5+ years of verified production experience with live applications For this project, I will focus on: 1. Designing and developing microservices using Fastify and FastAPI. 2. Building the Ride Alert dispatch system and integrating AI services for enhanced functionality. 3. Developing frontend apps for iOS and Android using React Native. 4. Ensuring robust security measures are in place with PostgreSQL row-level security. I’ve worked on similar projects, including one that leverages Stripe Connect effectively. My previous work can be seen at https://www.freelancer.com/u/reedsystems. I am confident I can deliver a high-quality solution within the specified timeline. Please let me know if you need any additional information or have questions. Thank you for considering my application. Reed

@mahig47

Hello! As per your project post, you’re looking to build Worldwide Black Car, a large scale SaaS platform for the licensed chauffeured transportation industry with a microservices architecture, AI powered services, multi application ecosystem, and a proprietary dispatch system. The goal is to create a highly scalable, secure, and reliable transportation platform capable of supporting operators, drivers, dispatchers, and customers across global markets. My focus will be on delivering a production ready platform featuring: microservices architecture, Ride Alert dispatch workflows, customer and driver applications, operator and admin portals, AI powered automation services, Stripe Connect split payouts, real time notifications, fleet and booking management, Kafka based event processing, PostgreSQL with row level security, Redis caching, Kubernetes deployment. I specialize in TypeScript, Fastify, Python, FastAPI, React, React Native, PostgreSQL, AWS, Docker, Kubernetes, Kafka, Stripe integrations, event driven systems, SaaS platforms, and enterprise grade backend architectures. My focus will be on building resilient services, secure payment workflows, and high performance applications. Let’s connect to review the complete platform specification, service boundaries, dispatch workflows, AI service requirements, and rollout strategy so we can define the best implementation roadmap and delivery plan. Best regards, Nikita Gupta.

@AZTURK1

Hi there, I understand this is a global SaaS platform built with TypeScript/Fastify, Python/FastAPI microservices, React Native web/mobile, PostgreSQL (RLS), Kafka, Redis, Docker/K8s on AWS with Stripe Connect payouts and a proprietary Ride Alert dispatch system , I’ve delivered similar microservice + payments work for fleet/transport clients. - Implement/extend FastAPI microservice endpoints and Kafka consumers for Ride Alert dispatch and booking events - Integrate and validate Stripe Connect split payouts flow for drivers, including onboarding, KYC callbacks, and payout reconciliation - Deploy Docker images to Kubernetes, add Helm manifests, configure Redis caching, DB row-level security checks, and CI/CD validation - Risk/quality-control: staged deployment with backup checkpoint, post-deploy validation and rollback plan Skills: ✅ TypeScript / Fastify ✅ Python / FastAPI ✅ Stripe Connect integration ✅ PostgreSQL (row-level security) & Kafka ✅ Docker / Kubernetes / AWS Certificates: ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 Available to start immediately. Is this already running on a live production server that I should work on directly or do you prefer a staged rollout? Price: $1500 , Delivery: 7 days. Best regards,

@alizain721

You call out 20 microservices and a proprietary Ride Alert dispatch system so I’m assuming the real risk is keeping low latency dispatch signals and payment state consistent across services while scaling globally. Those systems fail mainly where event ordering and payout finality meet user expectations. Kafka driven events plus Stripe Connect splits need clear compensating flows and observability. I built TicketSALO, a white label event ticketing SaaS that uses Stripe Connect for per ticket split payouts and an offline mobile scanner, which taught me how to design reliable payout flows and reconcile events under real world failures. My approach • Review your full spec and current repos then map ownership for each microservice and the Ride Alert flow • Implement a payments service with idempotent Stripe Connect onboarding and payouts plus reconciliation endpoints • Wire Kafka events to a dispatch proof of delivery pattern and add retry compensators and observability • Add PostgreSQL row level security rules, tests, and K8s deployment manifests for the services in scope Most relevant live project TicketSALO. Stripe Connect onboarding and split payouts implemented. I do not have prior black car or limousine specific experience. Timeline and price 8 weeks for the core payments and dispatch integrations, fixed price 1125 USD. Which two microservices do you want prioritized for Phase 1 and can you grant repo read access so I can draft an architecture diagram?

@sekai1116

With over a decade of solid experience building and delivering high-performance SaaS platforms, I recognize the unique demands that your Worldwide Black Car project presents. My tech stack proficiency, especially in TypeScript, Fastify, Python, FastAPI, React Native iOS and Android, React web aligns perfectly with what you need. More importantly, my expertise in PostgreSQL row-level security, Kafka, Redis, Docker, Kubernetes, AWS along with handling Stripe Connect split payouts, Twilio and SendGrid integration is quite extensive and they're the exact instruments you use to distribute the workload. Beyond matching your technical requirements in regards to your backend services and frontend apps development needs, my deep understanding of the transportation industry sets me apart from the competition. I possess valuable insights garnered from past projects working with black car services which have deeply familiarized me with the nuances of chauffeured transportation and dispatch systems like your proprietary Ride Alert. What I bring to the table is a strategic mindset focused on building reliable secure systems that are both scalable for growth and maintainable for efficiency. This coupled with my track record of meeting timelines on fixed-price contracts makes me an ideal fit for this project. Let's connect soon to discuss how my experience can elevate Worldwide Black Car.