Backend Architect Needed for Custom CRM SaaS – Phase 1 (API + Database)

@AwaisChaudhry

Hello, I'm Muhammad Awais. I will build Phase 1 with a strong backend foundation for a scalable SaaS CRM for field service businesses like automotive detailing, PPF, and tint. I will design a clean PostgreSQL schema, API-first endpoints (REST or GraphQL), and RBAC (admin/manager/technician) with multi-tenant isolation. The system will handle Customer and Vehicle assets, appointments with multiple jobs under one appointment, a per-job status workflow and timers with auditable logs, and notification triggers (SMS/email). Invoices, basic revenue reporting, and endpoints for common SaaS needs will be included, along with API docs and deployment scripts. Deliverables: a working backend with migrations, tested APIs, and a GitHub repository from day one. My approach emphasizes clarity, maintainable code, and a solid foundation to support future dashboards and mobile apps. 1) How would you model one appointment with multiple jobs, each with its own status and timer?\n\n2) How would you store job timers so they are auditable and accurate?\n\n3) One example of a SaaS or CRM backend you personally architected (brief description, not UI)?\n\n4) Do you prefer REST or GraphQL for Phase 1 API, and why?\n\n5) What are your deployment and data retention considerations (cloud provider, CI/CD, backups)? Best regards,

@a4logic

Hello, Dear Hiring Manager, As an accomplished and dynamic web service provider with a robust reputation for creating scalable and efficient solutions, I believe my team is the perfect fit for your backend CRM SaaS project. Over the years, we have honed our skills on numerous large-scale developments, making us well-versed in API design, database schema, authentication, data management, reporting and more. We have excelled in creating highly-functional systems that facilitate multiple job/task assignment under one appointment with individual status tracking. Our auditable yet precise timer system also promises to be a valuable attribute for this project. One of my notable projects includes designing a complex CRM backend for a client where efficiency and clarity in scheduling were paramount. Our solution allowed the system to manage appointments with different jobs like yours, providing real-time tracking and accurate timing per job. All our work is meticulously documented and adheres to the best standards for clean and maintainable code. Moreover, knowing I cannot offer only shortcuts but rather solid results; I can confidently ensure that our collaboration will be an invaluable choice. In summary, choosing us not only ensures proficiency in all the demanded technical aspects but also brings with it unyielding commitment to quality and customer satisfaction. With us onboard transforming your CRM Saas into a standalone product is Thanks!

@n2rtechnologies

Hello, I am excited about the opportunity to architect the backend for your custom CRM SaaS tailored for service-based businesses. My focus will be on creating a robust API and a scalable database that effectively supports the unique needs of industries like automotive detailing and tinting. I understand that a seamless user experience is crucial, and I will ensure that the API is designed for easy integration and high performance, while the database structure remains efficient and adaptable for future enhancements. My experience in developing similar projects equips me to deliver a solution that not only meets your current requirements but also positions your CRM for growth. Let’s discuss how we can bring your vision to life. Regards, Nurul Hasan

@divumanocha

Hello Greetings, After reviewing your project description, I am confident and excited to work on this project for you. However, 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. Thanks for your time! I am excited to hear from you soon. Best regards,

@extreamcode

Hi, Understanding the critical need for a scalable, well-architected backend that truly supports service-based SaaS growth, I’m confident I can deliver a clean, maintainable API and database foundation tailored specifically for your CRM. With extensive experience architecting SaaS platforms and backend systems using Node.js and PostgreSQL, I focus on crafting precise relational schemas, robust RBAC, and auditable workflow logic ensuring your appointment/job model and job timers are both reliable and transparent. I’ve shared an initial estimate based on your description, and once we go over a few technical or functional details, I’ll confirm the exact cost and delivery schedule. I’d love to discuss your requirements more to finalize the backend architecture and deployment plan for Phase 1. Could you share any specific preferences or constraints for the notification and reporting modules to better tailor the backend design? Sincerely, Asad

@shrec

I specialize in architecting API-first SaaS backends and would approach this Phase 1 as a durable foundation rather than a feature dump. I would model appointments as a parent entity with a one-to-many relationship to jobs, where each job has its own lifecycle state and references a job_time_entries table that records immutable start/stop segments (never overwriting time) to ensure full auditability and accurate totals. Job timers are derived from these append-only records, allowing reconciliation, corrections, and reporting without data loss. I’ve previously architected and built a multi-tenant service-business CRM backend (Postgres + Node.js) covering RBAC, scheduling, invoicing, and technician productivity reporting, and I’m comfortable owning schema design, API contracts, and long-term scalability from day one.

@LiveExperts

Hello, As seasoned architects and developers with a profound understanding of backend development and database design, we at Live Experts LLC believe we're equipped to handle your CRM SaaS platform project. Our proficiency in Node.js and our passion for building scalable, high-quality software makes us the perfect fit. Regarding your particular requirements, question 1: we would propose modeling one appointment with multiple jobs using a relational database approach. Each job can have its unique identifier mapped to a common appointment ID, which would allow aggregation by status or scheduler logic as needed later on. As for question 2, to ensure auditability and accuracy of job timers, we will store start and end timestamps for each job. These timestamps will be logged whenever there's a status change on individual jobs. Lastly, here's one example that aligns closely with your project requirements: We architected a CRM backend for service-based businesses similar to yours. It included efficient role-based access control, appointment handling with multiple tasks under one schedule, notification logging via various channels (SMS, email), invoicing system and comprehensible reporting endpoints. By employing our comprehensive skill set and past experience, we guarantee you a well-architected backend foundation that would align perfectly with your business needs. With Live Experts as your partner throughout this journey, there’s no Thanks!

@gunslinger

I’m a backend architect with strong experience designing API-first SaaS and CRM platforms, focusing on clean data models, auditable workflows, and long-term maintainability. The answers to your questions: 1) I model appointments as a parent entity and jobs as child records (appointment_id FK). Each job owns its own lifecycle (status, started_at, paused_at, completed_at) and is independently assignable to a technician. Shared context (customer, vehicle, schedule window) lives at the appointment level, while execution logic stays per job. This keeps reporting, billing, and workflow flexible. 2) Timers are event-based, not duration-based. I store immutable job_time_events (start, pause, resume, stop) with timestamps, actor, and source. Actual duration is always derived, never manually written. This ensures full auditability, prevents manipulation, and supports corrections without losing history. 3) I personally architected and built a multi-tenant CRM backend with RBAC, scheduling, invoicing, and reporting. Designed the relational schema, REST APIs, auth model, background jobs, and deployment from day one. Used PostgreSQL, Node/Python services, and API-first principles. Repo was client-owned from the start. I’m not bidding cheap but I’m building a backend that will scale and survive production. I built one in the past. You can check the review of my past US based client on my profile.

@shayona163

With my strong competency in MySQL, PHP, and Website Design, I believe I possess the skills to architect and design the backend for your Custom CRM SaaS. Although I have primarily worked with WordPress and Shopify, my experience in building websites from scratch would be immensely helpful in creating a scalable and sellable standalone SaaS product for your business. I employ an API-first mindset ensuring clean and well-documented code as well as a solid relational database design, both key to building robust backend systems. Speaking specifically to your project requirements, I will layout a comprehensive database schema utilizing my proficiency with MySQL databases. The ability to handle and store multiple jobs under one appointment is essential in streamlining workflow for field service companies; here, my experience designing complex web dashboards will be of tremendous value. Furthermore, I will leverage my prior work on scheduling logic and role-based access control to set up a transparent job status workflow and timer system which remains auditable. Although I haven't directly executed a SaaS backend similar to this before, my breadth of knowledge combined with my commitment to clean work ensures that the backend platform delivered at the end of Phase 1 will be both operational and scalable. As this project demands a high level of technicality, I guarantee high code quality which aligns with your expectations of clean, maintainable codebase

@ZohaibRoy

⭐⭐⭐⭐⭐ Build a Scalable Backend for Your Custom CRM SaaS ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project details and see you are looking for a backend architect for your custom CRM SaaS. You don’t need to look any further; Zohaib is here to help you! My team has completed 50+ similar projects focused on backend development. I will design a clean and efficient backend that supports your future web and mobile applications. ➡️ Why Me? I can easily build your backend as I have 5 years of experience in backend development, specializing in Node.js and Python. My expertise includes database design, API creation, and authentication systems. Additionally, I have a strong grip on relational databases like PostgreSQL and MySQL, ensuring a solid foundation for your project. ➡️ Let's have a quick chat to discuss your project in detail. I can share samples of my previous work, showing how I can deliver a robust backend solution. Looking forward to connecting with you! ➡️ Skills & Experience: ✅ Node.js Development ✅ Python Programming ✅ API Design (REST/GraphQL) ✅ Database Design (PostgreSQL/MySQL) ✅ Role-Based Access Control (RBAC) ✅ Job Status Workflow ✅ Notification Systems ✅ Invoicing Systems ✅ Reporting Endpoints ✅ Code Documentation ✅ GitHub Repository Management ✅ SaaS Platform Development Waiting for your response! Best Regards, Zohaib

@seefattechnologi

OKAY, I will surely help you to achive your given goals on Phase 1 --------------I have extensive experience with similar PROJECT ---->>I am highly qualified to do this job with high QUALITY ----- I am Passionate NODE.JS /Full stack developer having rich experience with so many successful Tasks. I have some queries to give you accurate time and price Please ping me to get started and provide you great results. Thanks

@shaktistanwar

Hello, I’m Shakti Singh from TechPro Compsoft (ISO & CMMI-certified). We design and build API-first, scalable SaaS backends for CRM and operational platforms. This project aligns perfectly with our experience in long-lived, sellable SaaS foundations. Architecture Approach (Phase 1 – Backend Only) 1. Modeling Appointments with Multiple Jobs I would model: appointments (customer, asset/vehicle, scheduled window, location) jobs (FK to appointment, service type, assigned technician, independent status) Each job has its own lifecycle, while the appointment acts as a container for billing, notifications, and reporting. 2. Auditable Job Timer Design Timers are event-based, not duration-based: job_time_events table Total time is calculated from immutable events This ensures auditability, accuracy, and dispute-proof reporting, even with pauses or reassignment. 3. Relevant SaaS / CRM Backend Experience I architected a field-service CRM backend supporting multi-role RBAC, job workflows, technician time tracking, invoicing, and reporting (Node.js + PostgreSQL). It was API-first and later consumed by both web dashboards and mobile apps—similar to your Phase 1 vision. Technical Stack • Node.js • PostgreSQL • RBAC with policy-based access • REST API (GraphQL optional) • Auth (JWT + refresh, extensible to OAuth) I’m not optimizing for speed alone—I’m optimizing for clarity, scalability, and long-term SaaS viability. Regards, Shakti Singh TechPro Compsoft

@gamdurbhullar

can you please discuss on chat

@managersingh

Hi, With over 8 years in the web/app development and designing field, I am ready to use my expertise to build a state-of-the-art custom CRM SaaS for your service-based business.I assure you that I will Mo not only focus on the present functionality but also ensure that we are laying down a strong foundation to make your product scalable and sellable. My skills in API Development, Backend Development, Database Design, MySQL, Node.js along with my proficiency in PHP and Magento align perfectly with your project requirements. To answer your questions: I would model one appointment with multiple jobs using a relational database design focusing on data integrity. Each job would have its corresponding status and timer, making it easily auditable and trackable. Regarding storing job timers, I would adopt a time-sensitive approach using timestamps to maintain accuracy. This experience combined with my meticulous approach to clean and maintainable code ensures I am not just capable of apis/plugins integration (as demonstrated in Shipstation, Quickbooks etc.) but proficient in full-stack development for demanding products like yours. Let's get started on designing and implementing a backend platform that will exceed your expectations!

@Rekhathakur

Hello I have thoroughly reviewed your project description and am confident in my ability to assist you in completing it successfully. I believe it would be highly beneficial to delve deeper into the specifics of the job to determine the most effective way forward. I am open to scheduling an interview at your convenience, and I genuinely appreciate the chance to collaborate with you on this project. Your response is eagerly anticipated, and I'm excited about the prospect of working together. Thank you for considering my proposal. Looking forward to your prompt reply! Best regards Rekha!!!

@JijoThomas2020

1. Modeling appointments with multiple jobs I would model this with separate normalized entities: appointments, jobs, and job_status_history. An appointment acts as a container (date, customer, location), while each job belongs to one appointment and represents a distinct unit of work (service type, assigned technician, pricing). Job status is handled independently per job using a state machine approach, allowing multiple jobs under one appointment to be in different states simultaneously. 2. Auditable and accurate job timers Timers should be event-based, not duration-based. I would store immutable job_time_events (start, pause, resume, stop) with timestamps, user/technician IDs, and source. Total time is always calculated from events, never overwritten, ensuring full auditability, accuracy, and the ability to detect anomalies or manual adjustments. 3. Relevant SaaS/CRM backend experience I previously architected a multi-tenant service-management SaaS backend with RBAC, scheduling, invoicing, reporting, and notification workflows using a Node.js API and PostgreSQL. I owned schema design, API contracts, reporting queries, and deployment from day one.

@DeveloperStation

Hi, We’ve built multiple CRMs and service management platforms, including a fully-fledged product for auto-detailing businesses. We understand the importance of a solid backend foundation for future web and mobile apps. We can handle all the backend tasks you mentioned, including database design, API development, and user authentication. We also have dedicated resources for front-end work, so you won’t need to hire a separate developer. Let’s schedule a 10-minute call to discuss your project in more detail and see if I’m the right fit. I usually respond within 10 minutes. I’m eager to learn more about your exciting project. Best regards, Adil

@Webtechfusion23

Hi Nicholas B., ➡️ I read your project description for creating a custom CRM SaaS tailored for service-based automotive businesses. Your focus on a scalable backend architecture for Phase 1 aligns perfectly with my expertise in backend development and system architecture. ⏺️ I specialize in building robust backend systems using Node.js and Python, with a strong emphasis on relational databases such as PostgreSQL. My approach ensures clean, maintainable code and a well-documented API. I have extensive experience with RBAC, API design, and the specific components you listed like job status workflows and notification systems. Regarding your project-specific queries: 1. I would model one appointment with multiple jobs using a relational database, where each job is a record linked to the appointment ID. Each job would have its own status and a timer start and end time to ensure accuracy and auditability. 2. Job timers would be stored in a separate table, recording start and end timestamps for each job. This timestamp data allows for precise tracking and easy auditing. 3. I architected the backend for a SaaS-based inventory management system, which included multi-tier user permissions, complex inventory tracking, and real-time data synchronization across devices. Regards, Aftab Ahmad Full Stack Developer (12 Years of Experience)

@hitech10

Hi, I’m interested in learning more about your project. We will execute Phase 1 with a backend-first roadmap—starting from domain modeling and architecture, then implementing APIs, RBAC, and reporting foundations. With a structured milestone plan and early validation, a production-ready backend can be delivered efficiently and set up for future web and mobile clients. If you award me this project, I’d be happy to discuss it further and get started right away. Development → Deployment Road-Map (Short): Architecture design, domain modeling, and database schema Auth + RBAC (admin / manager / technician) Core entities: customers, vehicles, appointments, jobs Reporting APIs and API documentation Deployment setup and GitHub-based delivery Required Answers: Appointments & Jobs: Appointments act as a parent entity; Jobs are child records linked via appointment_id, each maintaining its own status, technician, and lifecycle independently. Job Timers: Timers are stored as immutable time-log records (start, pause, resume, stop) per job, ensuring full auditability and accurate duration calculation. Relevant Experience: I’ve architected a multi-tenant service CRM backend with RBAC, scheduling, invoicing, and reporting APIs used by multiple client dashboards. I’m also interested in a long-term collaboration and future enhancements. For reference apps or websites for feature understanding and for better estimation, can we have discussion further? Best regards, Prakash.S