Full-Stack Developer for Recruiting SaaS Platform

@Hammadhassan21

Grüß Gott, A platform this deeply connected can’t be redesigned by simply changing the UI, the real challenge is modernizing it without breaking the workflows, integrations, tenant boundaries or sensitive data that already keep the business running. I’d start by mapping the current codebase, architecture, design system, regression coverage, and security boundaries, then modernize the recruiting, CRM, Outlook, booking, invoicing, and admin modules through controlled, testable milestones. The anonymized CV workflow, Microsoft Graph integrations, Outlook Add in, bilingual UX, and ZUGFeRD requirements deserve particular care, so I would keep these areas isolated, reviewable and properly tested rather than introducing risky changes across the platform. I have worked on similar SaaS, CRM, recruiting, and workflow heavy platforms and can show you similar examples in chat. I can also review the existing codebase and specification to identify dependencies, technical risks and a practical milestone structure before development begins. Portfolio: https://www.freelancer.com/u/Hammadhassan21 Best regards, Hammad Hassan

@Herculesz

Hi, The project requires careful extension of an existing multi-tenant recruiting SaaS platform with complex workflows and integrations, which demands strong architectural oversight to maintain data integrity and security. I usually structure enhancements by first reviewing the current codebase and data models to avoid regressions, as demonstrated in my Custom Feature Development & Integration project where I improved live systems with minimal disruption. The main risk lies in tenant isolation and secure integration with Microsoft 365 services, which must be architected to prevent data leakage and ensure reliable synchronization. I typically design layered systems separating UI/UX, backend logic, and external integrations to isolate failures and simplify maintenance. Systems like this benefit from robust security boundaries, audit logging, and fail-safe mechanisms for anonymization and data protection. I can help map out the ingestion and synchronization flows, review the tenant security model, and propose scalable architecture adjustments. Thanks, Hercules

@crtvecode

When a platform requires a redesign while preserving existing functionalities, the real challenge lies in maintaining operational continuity and data integrity. I recognize the importance of making sure your current workflows remain intact, especially during this transition. My approach will focus on a structured progression to mitigate risks and enhance your platform efectively: Phase 1: Codebase review and planning: Analyze existing functions and workflows for preservation. Phase 2: UI/UX redesign: Implement a modern interface while making sure usability in German and English. Phase 3: Feature enhancement: Integrate Microsoft 365, AI matching, and secure CV processing. Phase 4: Testing and deployment: Conduct thorough testing before a smooth transition to the live environment. I’m comfortable working via AnyDesk or TeamViewer if required. Could you clarify if there are specific features or integrations that must be prioritized in the redesign? Rajavel

@AnumFatima210

Hi, I went through your project details and understand what you're looking to achieve. I'd be interested in working with you on this. Based on the requirements you've shared, I can handle the project from start to completion while keeping the work aligned with your expectations, timeline, and desired outcome. My approach is straightforward: first, I'll make sure the requirements and expected deliverables are clear. Then I'll complete the work in structured stages, share progress along the way, incorporate your feedback, and deliver the final work after everything has been reviewed. Before we begin, I have a couple of questions about your requirements that will help me understand the scope more accurately. Feel free to message me so we can discuss the details and determine the best way to move forward. Best regards, Anum

@marjanahmed13

Hi! My name is Marjan and I'm here to offer you my services as a skilled applicant with over a decade of experience working on Freelancer.com. I believe I am the best fit candidate for this project due to my extensive experience; I would like to have a discussion to get to know that we both are on the same page. Once the scope will be locked, I will start working on it right away.

@denisSolution

Hi, I'm Denis, a full-stack developer specializing in multi-tenant SaaS platforms. I've built similar recruiting systems with candidate management, company workflows, and Microsoft service integrations. I understand the scope: UI/UX overhaul, language support, Microsoft 365 integration, secure document handling, AI-powered matching, and tenant isolation—all while preserving core functionality. My approach: 1. Conduct a thorough code review to map current architecture, data models, and dependencies 2. Plan UI redesign in parallel with backend improvements 3. Prioritize Microsoft Graph integration and OAuth flows early, as they impact multiple features 4. Implement candidate anonymization and CV processing with security as priority 5. Structure work in milestones: candidate management → company/project workflows → integrations → admin tools, with continuous testing and security hardening Key technical considerations: - Microsoft Graph reliability: Outlook sync and calendar events require robust error handling and retry logic - Validate tenant isolation to prevent data leaks between customers, especially with sensitive candidate information - Document existing dependencies thoroughly in week one to move forward confidently I'm available to start immediately and can adapt to your preferred milestone structure. A detailed specification review will help me provide a precise timeline. Let's connect and discuss the details. Thanks, Denis.

@dvcontact

Hello Sir, Would you like to see a tailored demo of our proposed enhancements to your recruiting SaaS platform before making any commitment? As an expert in full-stack development with extensive experience in SaaS solutions, I am confident in my ability to enhance your platform’s UI/UX and functionality while preserving its existing strengths. Let's discuss how we can bring your vision to life with a detailed plan and demo, ensuring your platform stands out in the competitive market. Regards, Smith

@temoberishvili

Hello! I see you're looking for a Senior Full-Stack Developer for your Recruiting SaaS platform. Your goal is to build a robust solution that streamlines the recruitment process, and I believe my experience fits well. With over 10 years in full-stack development, I’ve successfully handled projects that require expertise in PHP, AngularJS, and database development. I’m familiar with Microsoft Graph, which will be crucial for integrating various services. My approach combines strong backend capabilities with a sharp eye for frontend usability, ensuring a seamless user experience. I understand you have a budget between 150 - 450 EUR, and I’m confident we can create a solution that meets your needs within that range. Let’s chat about any specific features you envision for the platform and how we can make it a success. Looking forward to connecting! Clarification Questions: 1. What specific features do you want in the SaaS platform, particularly regarding user roles and permissions? 2. Are there any specific third-party integrations you have in mind beyond Microsoft Graph? 3. How do you envision the deployment process, and do you have any preferred hosting solutions in mind?

@arslanshahid386

Hi, I noticed you're looking to redesign and further develop your multi-tenant recruiting SaaS platform. With experience in PHP and AngularJS, I can efficiently enhance your existing system without starting from scratch. By leveraging these technologies, I will ensure that your platform is both scalable and user-friendly, maintaining the integrity of your current functions and data structures. This approach will preserve your workflows while providing a comprehensive UI and UX relaunch. Could you share more about any specific UI/UX challenges you're facing that need immediate attention?

@mughiraaa

hi, i can help redesign and further develop your existing recruiting saas without rebuilding the platform from scratch. we’ve worked on similar saas, crm and management platforms with complex workflows, user roles, integrations and secure backend systems. we can take care of the full ui and ux relaunch while carefully reviewing the existing codebase and preserving the current data and workflows. we can also handle the microsoft integrations, ai features, document processing, invoicing and security requirements as part of the development. i’d suggest working in clear milestones, starting with a codebase review and ui foundation before moving through the core modules and integrations. can we have a quick meeting to discuss the existing platform and specification? i can share relevant examples and explain how we’d approach the development.

@TechizeBuilder

Dear Client, I read "Full-Stack Developer for Recruiting SaaS Platform" carefully and understand you are looking for a full-stack developer who can handle both application development and AI integration. I have experience with PHP, Website Design, AngularJS, Full Stack Development, Backend Development and can work across the complete stack — frontend, backend, APIs, databases, authentication, third-party integrations and AI features. I can build scalable applications using modern technologies while keeping the codebase maintainable and production-ready. A few quick questions: Which AI models/APIs are you currently planning to use? Is there an existing application/codebase, or will the project be built from scratch? Thanks & Regards, Deepak

@jonasdedzo

Hi, I looked at your requirements and understand that the real challenge is modernizing the existing recruiting SaaS without breaking its current workflows, tenant data, or business logic. I can work from the existing codebase, first mapping the current architecture and critical workflows, then progressively redesigning the UI and extending the platform with candidate/company management, Microsoft 365 and Graph integration, CV anonymization, matching, CRM/sales workflows, invoicing, and administration. I’ll keep tenant isolation and security central throughout the work, with careful handling of OAuth, document processing, protected profile sharing, database changes, and existing data. Development can be organized into milestones so each major area is tested before moving forward. Two quick questions: What are the current frontend/backend technologies and database used in the existing codebase? Is the detailed specification already divided into priority phases, or should I help define the MVP milestones from the existing requirements? Jonas Dedzo

@mickeysz

Hallo, Bei einer Mandanten-SaaS mit Kandidaten-Daten ist die Datentrennung die wichtigste Entscheidung, und genau dort entstehen die Lecks. Ein Filter nach tenant_id im Code reicht nicht: eine vergessene Bedingung zeigt einem Kunden die Kandidaten eines anderen. Ich erzwinge die Trennung deshalb in der Datenbank per Row-Level-Security, sodass mandantenübergreifendes Lesen unterbunden ist, auch wenn im Code ein Filter fehlt. Bei Personendaten in Deutschland ist das nicht optional. Zweitens die "unumkehrbare Anonymisierung". Der Punkt, den viele falsch machen: echte Anonymisierung heißt, dass die identifizierenden Daten tatsächlich gelöscht und nicht wiederherstellbar sind, nicht nur ausgeblendet. Solange die Rohdaten irgendwo liegen, ist es Pseudonymisierung und DSGVO-technisch etwas anderes. Ich lege das so an, dass beim Anonymisieren die Klartext-Felder und die CV-Originale wirklich entfernt werden, inklusive Backup-Strategie, sodass es Bestand hat. Zum Bestand: das System wird nicht neu gebaut. Ich prüfe zuerst Datenmodell, Workflows und die Outlook- und Microsoft-365-Integration über Microsoft Graph mit OAuth, markiere behalten, überarbeiten oder ersetzen, und ändere in kleinen, getesteten Schritten, damit nichts Funktionierendes bricht. Der UI-Relaunch läuft Seite für Seite auf dieser Basis, mit DE/EN von Anfang an in der Struktur. Eine Frage: Nutzt die aktuelle Datenbank bereits Row-Level-Security, oder wird die Trennung heute nur im Code gemacht?

@longngoc2307

==== Hi - Truong here ==== "RECRUITING SAAS PLATFORM REDESIGN" - you need to modernize the existing product without breaking its current workflows, tenant data, or Microsoft 365 integrations. I would keep the current data model and workflows as the baseline, then rebuild the UI around them so existing features remain stable. I would also isolate tenant access at the backend level, especially for CVs, shared profiles, Outlook data, and protected links. The key risk is Microsoft Graph and OAuth during the redesign. I would map those existing flows first, then handle the UI, candidate management, matching, invoicing, and admin work in milestones. Which part of the existing codebase is currently the most difficult to change without affecting production workflows? Looking forward to work with you.

@MSaadJaved

Hi, I’ll redesign and extend your existing multi-tenant recruiting SaaS without breaking current data structures, including the UI/UX relaunch, Microsoft 365/Outlook integration, and secure candidate workflows such as CV processing and irreversible anonymization. The main technical concern here is preserving tenant isolation and existing workflows while adding AI matching, invoicing, and protected shortlist sharing, so I’ll start with a full codebase and architecture audit before touching features. I recently worked on a multi-tenant SaaS with role-based access, document handling, and third-party API integration. For your project, I’d begin with mapping the current domain model and workflow gaps, then implement the redesign in modular phases with testing around security, synchronization, and multilingual support. Could you share the current stack details and the areas you consider most sensitive for preservation? Best regards, NexLoom

@SkillCrafts

Your need for a senior full-stack developer to refine your multi-tenant recruiting SaaS echoes my recent experience optimizing a similar platform's core functionalities, including robust candidate and talent pool management with a focus on intuitive UX. I understand the critical importance of a seamless transition, preserving existing data and workflows while delivering a modernized interface. My approach involves a deep dive into your current codebase, identifying key areas for refactoring and enhancement within your existing architecture. I'll leverage a modern JavaScript framework (e.g., React/Vue) for the UI relaunch, ensuring responsiveness and performance. For backend services and integrations (Outlook Add-in, M365), I'll utilize robust APIs and potentially a microservices approach for scalability and maintainability. A detailed plan will outline iterative development cycles, focusing on early feedback and continuous integration. To ensure alignment, could you elaborate on the primary pain points you're experiencing with the current UI/UX that are driving this relaunch? Additionally, what are your key metrics for success in terms of user adoption and platform efficiency post-redesign? I'm eager to discuss how my technical expertise can translate into tangible improvements for your recruiting platform.

@Jennycreation

Hello Sir, I have already worked on similar types of website and software development projects and I am confident that I can successfully handle your project. I am a full-time freelancer with **17+ years of experience** in web development, software development, automation, and API integrations. My expertise includes: * ASP.NET C# web and software development * Android app development * Python automation and web scraping (Amazon, Instagram, Facebook, Google Maps, LinkedIn, Telegram, and other custom scraping solutions) * JavaScript, jQuery, AJAX, Bootstrap, HTML5 * Microsoft SQL Server database development * Payment gateway integration * SMS, Email, Banking, Financial, and Insurance API integration * Custom automation bots and workflow automation software I focus on delivering **high-quality, scalable, and reliable solutions** with clean code and long-term support. Please contact me in private chat so we can discuss your requirements in detail. I can also show you a **demo of similar projects** I have completed. Looking forward to working with you. Thanks & Regards

@carlosd178

Hello, After reviewing your project requirements, I understand you need an experienced full-stack developer to redesign and further develop an existing multi-tenant recruiting SaaS platform while preserving the current codebase, workflows, and data structures. The main challenge is upgrading a complex SaaS platform without disrupting existing functionality. My approach would be to first audit the current architecture and workflows, then proceed with UI modernization, backend improvements, integrations, security enhancements, and feature development through structured milestones. For the Microsoft 365 integration, I would use Microsoft Graph API with secure OAuth authentication for email/calendar synchronization and Outlook Add-in connectivity. Candidate documents and anonymization workflows would be handled with secure processing and privacy-focused design. A couple of questions: • What technology stack is the existing platform currently using? • Do you have a preferred milestone schedule for the UI relaunch, integrations, and backend improvements? I would be glad to review your specification and help evolve the platform into a modern, secure recruiting SaaS solution. Best regards, Carlos.

@cuyodigital

:) Hello, I'm Ricardo from Buenos Aires. :) What you have isn't mainly a redesign problem, it's a platform-continuity problem. The existing recruiting SaaS already has working data and workflows, so the priority is modernizing the interface and extending the platform without breaking tenant isolation or established business logic. I would first audit the current architecture, data model and tenant boundaries, then map the candidate, company, CRM and recruiting workflows. Next I would modernize the frontend and backend integrations, including Microsoft services, document processing, AI matching and protected profile sharing. Finally I would strengthen security, permissions and testing while preserving the existing workflows. I would avoid rebuilding working modules from scratch, especially where existing data and integrations already carry business rules. Which existing module is most critical to preserve unchanged during the relaunch? I can sketch the current-platform audit and modernization path before you decide anything. Free, no commitment. If you want, I can share examples of my previous projects here on Freelancer.com.