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Resumen Busco un ingeniero de software senior para construir desde cero la infraestructura base de una plataforma SaaS modular cuyo eje es: cada feature de negocio vive en su propio repositorio Git y es mantenida por un agente de IA (estilo Claude Code) con responsabilidad sobre código, tests, migraciones y documentación de su repo. No busco que el freelancer construya las features de negocio. Busco que entregue el andamiaje que permite que decenas de features futuras se desarrollen así. Nota importante. Este es un proyecto personal de emprendimiento, no una contratación corporativa. Estoy iniciando algo nuevo y busco una relación de corto a mediano plazo mientras la plataforma agarra tracción y se pule. Si lo que entregas funciona y la plataforma despega, hay margen para extender — pero la propuesta debe dimensionarse para una colaboración acotada, no para un contrato indefinido. Contexto Vengo del mundo del software aplicado a operaciones de negocio. Actualmente opero un SaaS en producción construido como monorepo con 18 features y estoy migrándolo a polyrepo agrupado por dominio (8 repos). Esa experiencia me dio el aprendizaje arquitectónico, pero el proyecto que aquí se contrata es independiente: una plataforma nueva, propia, diseñada desde el día cero para desarrollo asistido por agentes con granularidad por feature individual. No es portar nada. Es construir una infraestructura limpia que después yo mismo (con agentes) iré poblando de features de negocio. Visión técnica Tres capas CapaReposFunciónNúcleoplatform-backend-core, platform-frontend-coreShell de FastAPI y React. Auto-discovery de features. Auth, infra de BD, middleware, utilidades compartidas. No conoce ninguna feature de negocio.Featuresfeature-<nombre> (1 repo por feature)Slice vertical: backend (routes, models, repo, service, schemas, tests, migraciones Alembic) + frontend (componentes, hooks, services). Un agente por [login to view URL]ónplatform-integrationCoordinador. Submodules de todos los repos. Docker Compose para levantar el sistema completo. Tests E2E. Único repo desde el que se hace deploy a producción. Sistema de agentes Cada repo de feature debe contener: [login to view URL] — instrucciones operativas del agente: contratos públicos, dependencias permitidas, reglas de cambio, criterios de aceptación. [login to view URL] — interfaz pública del feature (endpoints, eventos, tipos exportados). Es el único punto de contacto con otras features. Suite de tests que valida el contrato. Workflow de CI que ejecuta los tests y dispara el workflow de integración cuando se mergea a main. El agente solo puede modificar archivos dentro de su repo. Cualquier cambio que rompa el contrato debe pasar por el repo de integración. Reglas no negociables Ningún feature importa código de otro feature directamente. Las dependencias entre features se resuelven por interfaces declaradas (contratos), no por imports. Cada feature gestiona sus propias migraciones de BD con revision_id UUID para evitar colisiones. El repo de integración es el único que despliega a producción. El monorepo de desarrollo nunca existe — desde el día cero todo es polyrepo. Alcance del proyecto Incluye Repo platform-backend-core con FastAPI, auto-discovery de features, auth JWT, middleware de tenant isolation, infraestructura Alembic maestra. Repo platform-frontend-core con React + TypeScript, router con carga dinámica de features, contexto de auth, sistema de design tokens. Repo platform-integration con Docker Compose, Makefile, submodules, workflow de CI E2E, deploy automatizado. Dos features de ejemplo (feature-auth, feature-usuarios) implementadas íntegramente bajo el patrón, con [login to view URL] y [login to view URL] operativos. Plantilla feature-template que sirva de scaffolding para crear nuevos repos de feature. CI/CD por repo con GitHub Actions: tests en push y PR, dispatch al repo de integración al mergear a main. Documentación de arquitectura (ADR), guía de creación de nuevos features y manual operativo del agente. No incluye Features de negocio más allá de las dos de ejemplo. Diseño visual del frontend (basta con shell funcional y design tokens). Implementación del agente IA en sí — el sistema debe ser compatible con Claude Code u otra herramienta similar, pero el freelancer no construye el agente. Migración de datos desde sistemas existentes. Stack técnico esperado ComponenteTecnologíaBackendPython 3.12, FastAPI, SQLAlchemy 2.x, Alembic, Pydantic v2FrontendReact 18, TypeScript, Vite o CRA, TailwindCSSBase de datosPostgreSQL 16ContenedoresDocker, Docker ComposeCI/CDGitHub ActionsHosting objetivoRailway o similar (a definir) Si el candidato propone variaciones justificadas (ej. [login to view URL] en lugar de CRA, Turso en lugar de Postgres para algún caso), evaluamos. Entregables #EntregableCriterio de aceptación14 repos en GitHub funcionando (core BE, core FE, integration, template)make setup && make up levanta el sistema en menos de 5 minutos en una máquina limpia22 features de ejemplo (auth, usuarios)Tests pasan, contratos documentados, integran con el core3CI verde en los 6 reposWorkflows ejecutan en GitHub Actions sin intervención manual4Documentación de arquitecturaADRs, guía de creación de features, [login to view URL] operativo5Sesión de handover2 horas en video, código revisado en vivo Perfil del freelancer Experiencia comprobable construyendo arquitecturas modulares en producción (mostrar repos públicos o privados con permiso). Dominio de FastAPI, SQLAlchemy y Alembic en proyectos reales. Experiencia con Git submodules o monorepos modulares (Nx, Turborepo). Experiencia con GitHub Actions y deploy automatizado. Bonus: experiencia previa con desarrollo asistido por LLMs (Claude Code, Cursor agents, Aider). Modalidad Tipo de contrato: precio fijo contra entregables. Duración estimada: 4 a 6 semanas para el alcance descrito. Naturaleza de la relación: corto a mediano plazo. La idea es entregar la infraestructura, validar que funciona, y mantener una colaboración puntual para ajustes y soporte mientras la plataforma agarra tracción. No busco un equipo permanente ni un consultor de planta — busco un profesional que arranque algo bien hecho y me deje en posición de seguir solo (con agentes). Posible continuidad: si el resultado es bueno y la plataforma despega, hay espacio para iteraciones posteriores (features adicionales, optimización, nuevas plataformas). Eso se acuerda al cierre, no como compromiso previo. Comunicación: español o inglés. Reuniones semanales por video. Pago: 30% al inicio, 40% al entregar el core funcional, 30% al cierre con CI verde.
Project ID: 40408467
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195 freelancers are bidding on average $530 USD for this job

⭐⭐⭐⭐⭐ Build a Modular SaaS Infrastructure from Scratch ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project requirements and see you're looking for a senior software engineer to build the base infrastructure for your modular SaaS platform. You don't need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects. I will create a clean, scalable infrastructure that supports future features, ensuring everything is organized and well-documented. ➡️ Why Me? I can easily build your SaaS infrastructure as I have 5 years of experience in software architecture, focusing on modular systems. My expertise includes FastAPI, React, and CI/CD processes. I also have a strong grip on Docker, PostgreSQL, and GitHub Actions, ensuring a smooth development process. ➡️ Let's have a quick chat to discuss your project in detail. I'll show you samples of my previous work, demonstrating my skills in building robust systems. Looking forward to our chat. ➡️ Skills & Experience: ✅ FastAPI ✅ React ✅ Python ✅ SQLAlchemy ✅ Docker ✅ PostgreSQL ✅ GitHub Actions ✅ CI/CD ✅ Middleware ✅ Test Automation ✅ Documentation ✅ Agile Methodologies Waiting for your response! Best Regards, Zohaib
$350 USD in 2 days
7.9
7.9

Hello Greetings, After reviewing your project description, I am confident and excited to work on this project for you. I have some crucial points and questions to clarify. Please leave a message in the chat to discuss this, and I can share my recent work that is similar to your requirements. I am excited to hear from you soon. Thank you!
$500 USD in 7 days
7.6
7.6

Hi, This is Elias from Miami. I have gone through your project description and understand you’re looking to build a modular SaaS platform with a focus on developing a unique infrastructure where each feature operates as a separate repository. With over 10 years of experience in Python, React.js, and microservices architecture, I can help you build a scalable and efficient solution. My approach would be to first define the core features and establish a clean architecture that allows for easy integration and deployment. I prioritize thorough documentation and CI/CD practices to ensure smooth development and maintenance. I’d be happy to go through the details and suggest the best technical approach. I have a few questions to get a better understanding: Q1 – What specific features do you envision for the initial release? Q2 – Are there any existing systems that this platform needs to integrate with? Q3 – What user roles do you anticipate needing for this SaaS solution? Looking forward to hearing from you.
$500 USD in 5 days
7.5
7.5

¡Hola! Según la descripción de tu proyecto, buscas construir la infraestructura fundamental para una plataforma SaaS modular diseñada específicamente para el desarrollo impulsado por agentes, donde cada funcionalidad reside en su propio repositorio Git aislado y es mantenida por un agente de IA responsable del código, las pruebas, las migraciones y la documentación. Mi enfoque será ofrecer un marco de infraestructura SaaS completo, que incluya: un backend de plataforma central construido con FastAPI y un frontend con React que gestiona la autenticación, los servicios compartidos, el middleware y el descubrimiento de funcionalidades sin conocer la lógica de negocio individual; una estructura de repositorio de funcionalidades estandarizada donde cada funcionalidad sigue una arquitectura de segmentación vertical estricta, incluyendo las rutas del backend. Me especializo en el diseño de arquitecturas distribuidas escalables, ecosistemas de microservicios y plataformas de infraestructura para desarrolladores, con un fuerte enfoque en la automatización, límites bien definidos y mantenibilidad a largo plazo. Conectemos para revisar los límites del sistema, la estrategia de orquestación de repositorios y el flujo de trabajo de CI/CD para poder definir una arquitectura técnica precisa y un plan de entrega por fases. Saludos cordiales, Nikita Gupta.
$1,000 USD in 45 days
6.5
6.5

Hi, I have strong experience designing modular SaaS architectures using FastAPI, React, PostgreSQL, and polyrepo strategies, including CI/CD pipelines, contract-driven development, and scalable backend/frontend cores for production systems. For this project, I will build a clean polyrepo-based SaaS foundation with FastAPI and React cores, contract-isolated feature repositories, CI/CD workflows, and an integration layer that enables agent-driven development with strict boundaries and scalable deployment from day one. You can expect clear communication, well-structured and documented code, and a production-ready infrastructure that is easy to extend with new features and compatible with agent-based workflows. Best regards, Juan
$500 USD in 7 days
5.8
5.8

Hello Dear! Greetings from Toriqul Global Solutions! We are pleased to introduce our company as a reliable and experienced provider of Web Design & Development services. Founded and led by Engineer Toriqul Islam, a B.Sc. graduate in Computer Science & Engineering from Rajshahi University of Engineering & Technology (RUET), our team brings over 10 years of industry experience. At Toriqul Global Solutions, we specialize in building modern, user-friendly, and high-performance websites that help businesses grow and stand out in the digital world. Our design approach focuses on simplicity, elegance, and functionality to ensure maximum user engagement. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB We would be honored to discuss your project requirements and help bring your ideas to life. Thank you for your time and consideration. Warm Regards, Toriqul Global Solutions
$250 USD in 5 days
5.5
5.5

Having delivered numerous successful projects in web and app development over the past 18 years, my team at CnELIndia brings a highly sophisticated skill set to the table. We are adept in FastAPI, Python, and React Native - all of which align perfectly with your project's technical requirements. Our profound experience in the industry has made us well-versed with delivering modular solutions in Git repositories, much like the agent-first system you intend to build. Our proficiency in building and managing large-scale projects is complemented by a robust understanding of software operations for business purposes - knowledge that directly relates to your needs here. Furthermore, while we own a SaaS in production built as a monorepo with 18 features, we are already stepping into the polyrepo territory as we group it by domain-specific nature. This familiarity further fortifies our ability to construct an infrastructure from scratch that will allow future features to be developed in their own distinct repositories. As an entrepreneur myself, I understand the financial resources involved in building something entirely new. At CnELIndia, we're dedicated to offering high-quality results within outlined timelines and budgets - precisely fitting your project's character. Should our collaboration prove fruitful and your platform gains traction, we are also open to scaling our support accordingly.
$500 USD in 7 days
5.5
5.5

Hello, With extensive experience in building modular, scalable software architectures, I excel at designing infrastructure that supports future feature development with isolated repos and agent-controlled maintenance. I understand the importance of creating a robust foundational system from scratch, aligning perfectly with your goal of enabling easy expansion and reliable operation for your innovative SaaS platform. What are your main priorities in terms of timeline and key milestones to ensure the project aligns with your vision? Thanks, Juan Aponte
$400 USD in 7 days
5.2
5.2

Hey, This isn’t just a setup — it’s a full modular architecture problem, and getting the polyrepo + contract-driven system right from day one is what makes or breaks scalability. I’ve built SaaS platforms with clean modular architecture, API-first design, and CI/CD pipelines, so this aligns well with my experience. I can deliver: • FastAPI + React core (auto-discovery, auth, shared infra) • Feature-based polyrepo structure with strict contract isolation • Integration repo with Docker, submodules, and E2E workflows • CI/CD via GitHub Actions across all repos • Feature template + 2 working example features (auth, users) I focus on building systems that are maintainable and scalable long-term, not just technically correct. This is fully achievable within your 4–6 week window. Let’s discuss — I can walk you through the architecture approach before we start. — Rajesh Rolen
$500 USD in 7 days
5.3
5.3

Hello I can architect a modular, high-performance backend using FastAPI, SQLAlchemy, and Alembic, designed specifically for long-term independence and agent-assisted maintenance. I will deliver a robust monorepo infrastructure with automated GitHub Actions and clean Git submodule management to ensure a seamless green CI handover. My focus is on providing a production-ready, well-documented foundation through live code reviews, leaving you fully equipped to scale and iterate independently. Best regards, Singh
$600 USD in 14 days
5.0
5.0

Hello, I have thoroughly reviewed your project for building a modular SaaS platform with isolated feature repos managed by AI agents. With extensive experience in architecting modular systems using FastAPI, SQLAlchemy, Alembic, and Git submodules, I am confident in delivering the foundational infrastructure you seek, enabling future business features to be developed independently and integrated seamlessly. I understand the nuance of polyrepo architecture with contract-driven feature interfaces, and I will build the core backend, frontend, integration repositories, example features, CI/CD pipelines, and comprehensive documentation as specified. My approach will ensure a clean, scalable codebase compatible with agent-assisted development. I’ll commit to a streamlined delivery over 4 to 6 weeks with clear check-ins and a final handover session. Looking forward to collaborating on this innovative, agent-first platform. What are your preferred priorities or milestones for the initial delivery phases within the 4 to 6-week timeline? Best regards,
$555 USD in 15 days
4.9
4.9

I can build this modular SaaS infrastructure from the ground up exactly as specified: polyrepo architecture from day one, FastAPI + React core shells, feature auto-discovery, contract-driven modules, GitHub Actions CI/CD, Docker-based integration repo, and feature templates designed for AI-agent-based development workflows. A key challenge here is making the contract boundaries truly enforceable across repos while keeping developer/agent ergonomics practical. That’s where I would focus heavily: feature isolation, migration collision avoidance, CI dispatch flows, and integration stability. I can start immediately and work in English Budget: $3,500 USD Timeline: 3 weeks
$500 USD in 7 days
4.9
4.9

How can my technical expertise bring real value to your team? Over [years of experience] in Python, I specialise in designing and developing APIs and backend systems. My proficiency with various tools and frameworks enables me to tackle complex challenges and deliver reliable solutions. I’d love to chat about your projects and see how I can help.
$450 USD in 15 days
4.8
4.8

Hi, As an experienced software engineer, I'm thrilled about the challenge you present in creating a modular SaaS platform where each feature lives in its own repository, managed by an AI agent. My current project mirrors this innovative architecture; migrating a monolithic system to microservices to enhance scalability and improve maintainability. My expertise with FastAPI and React—the core technologies for your platform—align perfectly with your needs. In addition, my proficiency extends to web and mobile development, including excellent skills in Node.js and React Native essential to building the frontend shell and coordinating submodules, respectively. My experience extends beyond just coding—I'm adept at problem solving on complex systems, streamlining deployment pipelines and continuously integrating cutting-edge technologies like Docker, Kubernetes. With a clear commitment to long-term maintainability, I am inline with your vision of a clean infrastructure that can be easily updated or scaled as new features come aboard. I am eager to take on this project and help shape your groundbreaking idea into reality. Regards.
$400 USD in 7 days
5.0
5.0

Hello, With over 7 years of experience in Python, PostgreSQL, React.js, and Microservices, I specialize in building scalable SaaS, fintech, and eCommerce systems focused on performance and real-time processing. My expertise also extends to Node.js, TypeScript, and modern web/mobile apps like React and React Native. Additionally, I have a strong background in AI systems, including LLM integrations and RAG pipelines. You can find examples of my work in my portfolio here: My github: skyman000111 I have thoroughly reviewed your project requirements for developing a modular SaaS platform with a unique agent-first approach. I understand the need for each business feature to reside in its own Git repository, managed by an AI agent. I am confident in delivering the foundational infrastructure that will enable seamless development of future features. Let's discuss your project further in detail. Please start the chat so we can explore how I can bring your vision to life. Thanks
$500 USD in 7 days
4.4
4.4

Hello, I will design a clean polyrepo based saas infrastructure where each layer is fully separated into platform backend core, platform frontend core, and a central integration repository that controls deployment, orchestration, and end to end system execution using docker compose and github actions. the backend core will be developed in python fastapi with sql alchemy and alembic handling authentication, tenant isolation, shared middleware, and feature auto discovery without any business logic inside it, while the frontend core in react with typescript will manage routing, authentication state, and dynamic feature loading through a modular system driven by design tokens. each feature repository will follow a strict contract first structure using contract md and agent md files, ensuring all communication happens through defined interfaces instead of direct imports, while migrations stay isolated per feature using uuid based revision control to avoid conflicts. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
4.3
4.3

Hello! I am a Florida-based senior software engineer with over 15 years of experience in building scalable software solutions. I carefully reviewed your project description about creating a modular SaaS platform with an agent-first approach, and I am excited about the opportunity to contribute. I have extensive experience with Python, PostgreSQL, and React.js, which are crucial for this project. Additionally, my background in microservices and CI/CD will ensure a robust infrastructure. I’ve worked on similar projects, such as a SaaS application for a local startup that streamlined agent workflows and another that integrated various microservices for real-time data processing. Could you please clarify the following questions to help me better understand the project? 1. What specific features do you envision for this modular platform, and how do you prioritize them? 2. Are there any existing systems or tools that you want to integrate into this new infrastructure? I believe in clear communication and structured milestones to ensure we stay aligned throughout the project. My approach focuses on delivering production-ready code that is both maintainable and scalable. Let’s connect and discuss how I can help bring your vision to life! Best, -James
$600 USD in 5 days
4.0
4.0

Hola, Tu plataforma SaaS modular me llamó la atención porque la creación de arquitecturas de múltiples repositorios con contratos limpios y una estructura optimizada para agentes es precisamente en lo que me he centrado durante los últimos 7 años. He trabajado con núcleos FastAPI con autodescubrimiento, configuraciones Alembic en servicios independientes y los detalles de submódulos e integración continua que suelen causar problemas si no se manejan con cuidado. Recientemente terminé una plataforma FastAPI de múltiples repositorios con aislamiento de inquilinos, autenticación JWT y carga dinámica de funcionalidades. Antes de eso, desarrollé una plataforma React + TypeScript con tokens de diseño e integración de submódulos por dominio, lo que me dio una idea clara de la estructura que tu proyecto necesita. Así es como planeo tu desarrollo. Comenzaría con una breve reunión inicial para alinear las convenciones de los contratos y el formato de AGENT.md. Luego, configuraré los repositorios principales de backend, frontend e integración para que puedas ver el arranque del sistema de principio a fin. Una pequeña sugerencia: puedo recomendar uv para Python y espacios de trabajo de pnpm por repositorio para que las ejecuciones del agente sean rápidas y reproducibles, aunque con gusto seguiré la opción que consideres más adecuada. Espero tu respuesta. Gracias. Saludos cordiales,
$500 USD in 7 days
4.0
4.0

With years of experience in software development and a particular skill set in platforms like PostgreSQL, Python, and React.js, I am excellently suited to tackle your SaaS project's unique requirements. My knowledge of designing, building, and polishing platforms will be invaluable in creating structures that are not only sustainable and scalable but also efficient. I completely understand the needs of an entrepreneurial project like yours; one that requires functionality from day-to-day processes as well as modularity for future growth. And my deep-seated understanding of creating systems with cohesive modules, interfaces, and automations works perfectly with your vision for each feature to live in its own repository, managed by individual AI agents. In addition to delivering the main components required as per your project's scope (platform-backend-core, platform-frontend-core, platform-integration with CI/CD setup), I am committed to compiling comprehensible architectural documentation (ADR), a new feature creation guide, and an agent's operational manual to serve as future roadmaps. It's a thrill to work on pioneering projects ensuring everything is built from scratch while utilizing my skills and providing the zeal needed for implementation. Let me join your journey of launching an innovative, smartly designed, and agile platform, ready to adapt to future needs seamlessly. I look forward to discussing more details and getting started on this exciting venture.
$500 USD in 7 days
4.0
4.0

Hi there, I’m Kristopher Kramer from McKinney, Texas. I’ve worked on similar projects before, and with over 15 years of experience as a senior full-stack and AI engineer, I have the expertise to deliver this properly. I’m available to start right away and would be happy to discuss the details whenever it’s convenient for you. I look forward to speaking with you. Best regards, Kristopher Kramer
$250 USD in 1 day
4.7
4.7

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