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Long-Term Full Stack Developer ([login to view URL] / React / TypeScript) + Security Mindset We are looking for a proactive Full Stack Developer to join a growing maritime software startup for an intensive one-month engagement, with a strong possibility of transitioning into a long-term role. The application is already well advanced. The goal is to spend the next month strengthening the platform, eliminating weaknesses, improving security, refining workflows, and preparing the product for production deployment. Current Technology Stack * Frontend: [login to view URL], React, TypeScript * Backend: [login to view URL] API Routes, Server-Side TypeScript * Database Layer: Repository Pattern (currently local/demo data, production database integration planned) * Authentication: Role-based access control, demo users, private portal workflows * Integrations: * Telegram Bot * OpenAI document and receipt intelligence * Future Google Workspace and export integrations Responsibilities You will work directly with the founder in a highly collaborative environment. Key objectives include: 1. Review overall application architecture and code quality. 2. Identify and fix bugs across all user workflows. 3. Strengthen authentication, authorization, and session management. 4. Review role-based permissions across vessels, offices, captains, crew members, and administrators. 5. Audit API routes for: * Data leakage * Privilege escalation * Insecure Direct Object References (IDOR) * Authentication bypasses 6. Prepare the application for production deployment. 7. Recommend and help implement a secure architecture for: * Database * Storage * Secrets management 8. Secure file uploads, receipts, evidence photos, and document previews. 9. Review Telegram and OpenAI integrations from a security perspective. 10. Create a clear security checklist and remediation roadmap. 11. Help structure: * CI/CD pipelines * Environment variables * Backup strategies * Monitoring and logging 12. Improve the user experience where needed: * Modify existing screens * Add or remove forms * Refine workflows * Improve usability and interface consistency Ideal Profile * Strong experience with [login to view URL], React and TypeScript. * Comfortable working across both frontend and backend. * Experience preparing SaaS products for production. * Strong debugging and problem-solving skills. * Experience with PostgreSQL, Supabase, authentication systems and multi-user applications. * Ability to work independently and proactively suggest improvements. Big Plus * Cybersecurity background. * Application security experience. * Security audits and penetration testing knowledge. * DevSecOps experience. * Previous work on fintech, enterprise SaaS, logistics, maritime or highly regulated systems. Working Style * Direct 1:1 collaboration with the founder. * Regular FaceTime/Google Meet calls. * Fast communication. * Long-term mindset. * Startup environment where initiative and ownership matter. Duration Initial engagement: 1 month Potential extension: Long-term / permanent collaboration for the right candidate. To Apply Please share: * Relevant projects or repositories. * Your experience reviewing and securing production applications. * Examples of architecture reviews, QA work, security audits, or production launches. * A brief explanation of why you believe you are a good fit for this role. We are looking for someone who can think like both a developer and a security auditor, while helping transform a rapidly growing platform into a production-ready product.
Project ID: 40503424
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175 freelancers are bidding on average $517 USD for this job

With over a decade of experience in full-stack architecture and high-scale systems, I understand the importance of strengthening your maritime software platform, eliminating weaknesses, and improving security to prepare it for production deployment. My background in scaling applications for over 1 million users and expertise in high-security FinTech systems align directly with the challenges your project faces. My strategic insight for your project is to conduct a thorough review of the overall application architecture and code quality while focusing on strengthening authentication, authorization, and session management. My past success in scaling Telegram Mini Apps to serve a large user base demonstrates my ability to handle complex projects like yours. I encourage you to reach out to me to discuss how we can collaborate to reinforce the security of your platform and enhance the user experience. Let's connect to strategize the roadmap for making your maritime software startup a success.
$600 USD in 20 days
6.9
6.9

Hi there, I have over a decade of experience working across full stack tech, helping startups take products from early stages to production. I can share some relevant projects and examples during our discussion. I've read the requirements carefully, and I got it—this is less about adding features and more about hardening the existing platform, reviewing workflows, improving security, and making sure everything is production-ready before launch. Yes, I have done similar work before where I reviewed existing applications, fixed issues across user flows, tightened role-based permissions, prepared database and storage architecture, secured file uploads and third-party integrations, and helped set up environment management, backups, monitoring, and deployment pipelines as products moved from demo environments to production. I believe I would be a good fit for this role because I like working closely with founders, taking ownership, and proactively suggesting better ways to structure and secure the system rather than simply implementing tasks. I'd be happy to connect, review the current state of the application, and help prioritize what should be addressed during the next month to prepare the platform for launch. Thanks, Rahul A.
$400 USD in 30 days
6.7
6.7

A maritime SaaS with role-based access across vessels, offices, captains, and crew needs security-first thinking before production. I'd spend the first week on code/architecture review and then fix the highest-risk items: • Architecture and auth audit — RBAC, session handling, IDOR risks, role escalation paths • Secure file uploads, receipt/document previews, and evidence-photo handling • Harden Telegram and OpenAI integrations (input validation, rate limits, logging) • Bug fixes and UX consistency pass across workflows • Production-readiness checklist and deployment roadmap I've worked on multi-role SaaS platforms with similar permission models; the RBAC + document-handling combination is where most maritime/ops apps accumulate risk. A focused one-month pass should leave you confident enough for production.
$600 USD in 30 days
4.7
4.7

Hello Dear! Good Day! Hope you are doing fine. This is Ruhul Ajom Sagor. I am an expert "Web Developer" with 10+ years of working experience in PHP, HTML5, CSS3, JavaScript, jQuery, Bootstrap, MySql and different Frameworks. I have completed my B.S.C Engineering in Computer Science and Engineering (CSE) from BUET. Hire me and you don't have to worry about your website problems again! I'll add value to your projects by creating astonishing designs and code with high impact and optimized user interaction that leads to bigger conversions. WHAT PROBLEMS CAN I HELP YOU SOLVE? • Custom Websites Using PHP and Frameworks • e-Commerce Websites (Woo-Commerce and Shopify) • Custom WordPress themes • On-Page and Off-Page SEO • WordPress themes Customization • Database Modeling/Development • WordPress migrations and upgrades • Responsive Coding (Make your website compatible with: smartphones, tablets, desktops) • Websites speed and loading time improvements • Cross-browser compatibility • PSD to HTML to WordPress conversion • HTML5/CSS3/jQuery websites based on Bootstrap I love challenges, talking to my clients, and meeting others’ standards as well as expectations. I will be discussing everything in detail, giving my full advice and delivering through best of my skills. You are cordially welcome to discuss your project. Thank You! Best Regards, Ruhul Ajom
$500 USD in 7 days
4.4
4.4

Hi, I can help with making your maritime platform production-ready by hardening security, fixing workflow bugs, and strengthening role-based access across the app. js architecture and API routes, then run targeted security checks (auth/IDOR/session/file uploads) while fixing issues in small, testable PRs. What’s your current auth/session approach and what storage method will you use for receipt/evidence files? Do you already have a staging environment for production deployment prep? If you share access details, I can begin immediately.
$250 USD in 3 days
1.6
1.6

Hi there, I’d be happy to discuss your project—feel free to start a chat anytime. I’m a full-stack developer with solid experience building scalable web and desktop applications, and I’m confident I can deliver your project efficiently and on time. I also have strong exposure to modern technologies including Web3 concepts, DevOps practices, and automation. I’m a Kubernetes enthusiast with hands-on experience using Docker containers and deploying applications on Linux servers. My expertise includes: MERN / MEAN Stack (development + team management) .NET Core APIs with Angular, including D3.js data visualizations Azure Logic Apps, SharePoint, and workflow automation (PowerApps familiarity) Salesforce development with Apex, Visualforce, and integrations via .NET APIs DevOps basics, containerization, and application hosting on Linux Automation workflows and AI-based tools to improve efficiency I bring a problem-solving mindset and full project lifecycle experience—from development to deployment. Looking forward to hearing from you. Thank you!
$500 USD in 5 days
1.5
1.5

Hi, Good day, I reviewed your project details carefully and can see strong potential to build something both technically solid and polished from a user experience perspective. As a Senior Full Stack Engineer, I focus on delivering scalable, well-structured solutions that are not only functional, but also reliable, maintainable, and aligned with real business goals. I take a practical, results-driven approach throughout development, with clear communication, clean architecture, and attention to both performance and usability to ensure the final product meets your expectations on every level. I bring over 10 years of experience as a Senior Software Engineer, specializing in building scalable, high-quality, and maintainable systems across a wide range of projects. My approach combines strong technical expertise with clear and reliable communication, allowing me to deliver solutions that are not only technically sound, but also aligned closely with business objectives and long-term growth. I’m excited about the opportunity to contribute to your project and deliver reliable, high-quality results. Before getting started, I have a few quick questions to ensure everything is fully aligned with your expectations and project goals. I would appreciate it if you could send me a message when you are available. Cheers, Jonny Ha
$450 USD in 7 days
0.0
0.0

꧁⎝ ?༺ Hello ༻? ⎠꧂ As a seasoned, senior AI Mobile App Developer with a specialization in React Native and Flutter, I am perfectly suited to take on the responsibility of being your Full Stack Developer for your maritime software startup. With my extensive experience in building mobile apps from the ground up, a vital skillset in this endeavor, I am capable of ensuring that your application receives the comprehensive strengthening it requires. My proficiency in PostgreSQL dovetails nicely with your requirements for integrating a production-grade database into the application. Combined with my extensive background in SaaS product development and payment system integration, I will prepare the application for production deployment. Additionally, my expertise in API integration will help ensure seamless future expansion and compatibility - including your planned Google Workspace and other export integrations. Another core quality that makes me an ideal fit is my security-driven mindset. Aware of how high-risk systems like yours demand utmost care, I can audit the API routes, seeking out vulnerabilities such as privilege escalation or authentication bypasses. You are far more than just another gig for me - you're valuable partner on a project with long-term goals and I guarantee that same dedication to security which has characterized my past engagements. Simply put, choosing me means hiring peace of mind and professionalism for secure pair of hand Thanks, Dennis
$250 USD in 4 days
0.0
0.0

Hello, Your project is particularly interesting because it combines application development, security auditing, and production-readiness—areas where I regularly contribute. I can review the existing architecture, identify workflow and code-quality issues, strengthen authentication and RBAC controls, audit API routes for security vulnerabilities such as IDOR, privilege escalation, and data exposure risks, and help prepare the platform for a secure production launch. Beyond security, I'm comfortable improving UX, refining workflows, implementing CI/CD practices, organizing environment management, monitoring, logging, backups, and designing scalable database and storage strategies. I also have experience working with AI-powered integrations and understand the importance of securing document processing, file uploads, and third-party services. I enjoy startup environments, proactive collaboration, and working directly with founders to turn ambitious products into reliable production systems. My approach is not only to fix issues but also to provide a clear roadmap for future growth, security, and maintainability. I'd be happy to discuss your current architecture and how I can help strengthen the platform during the upcoming month and beyond. Best regards Jane Buro
$500 USD in 7 days
0.0
0.0

I have 6 years of experience as a full-stack developer and am a perfect fit for your requirements. I hope we can collaborate on this project.
$500 USD in 7 days
0.0
0.0

Hello, I am interested in this opportunity. I have nearly 8 years of experience as a Technical Lead and Full Stack Developer, delivering enterprise applications, ERP systems, API integrations, and production deployments. My experience includes architecture review, code quality assessment, authentication and authorization design, role-based access control, API development, PostgreSQL, TypeScript, cloud deployment, CI/CD, and system integration. I have led multiple projects from design through production, working closely with business stakeholders and development teams. For your platform, I can help review the existing architecture, identify bugs and security risks, strengthen authentication and session management, audit API routes, improve role permissions, review OpenAI and Telegram integrations, and recommend a secure production-ready architecture. I can also assist with deployment planning, environment management, monitoring, logging, backups, and workflow improvements. I enjoy working in startup environments, collaborating directly with founders, and proactively suggesting improvements that improve security, maintainability, and user experience. I would be happy to discuss your current platform, priorities, and roadmap to help prepare the application for a successful production launch and long-term growth. Best regards, Phyo Thet Paing
$500 USD in 7 days
0.0
0.0

The project includes frontend and backend development, database integration, API connectivity, responsive design, security implementation, testing, deployment, and technical support.
$500 USD in 7 days
0.0
0.0

Dear Valued Client, I hope you are doing well. After reviewing your project requirements, I am confident that I have the skills, experience, and dedication needed to deliver a high-quality solution that meets your expectations. As a Senior Software Engineer, I specialize in developing reliable, efficient, and user-focused solutions while maintaining clear communication and meeting project deadlines. I take pride in understanding my clients' goals and delivering results that provide real value. My structured approach ensures quality, transparency, and timely completion throughout the project lifecycle. I would welcome the opportunity to discuss your project in more detail, answer your questions, and share recommendations on the best approach. Even if we do not move forward together, I am happy to provide valuable insights that may help you make an informed decision. Kind Regards, Phakisang Molefe Senior Software Engineer
$400 USD in 7 days
0.0
0.0

WE HELP BUSINESSES TURN IDEAS INTO RESULTS!! We recently worked with a client who needed a similar solution and helped them move from planning to a finished product that delivered real value for their business. What stood out to me about your project is that you're not just looking for someone to complete a task. You're looking for a reliable team that understands the bigger picture and can create something that is effective, professional, and built to last. Our team covers design, development, automation, integrations, optimization, testing, and ongoing support etc. If you're looking for a team that takes ownership, communicates clearly, and genuinely cares about the success of your project, we're ready to help. I'd love to chat about your project! The worst that can happen is you walk away with a free consultation! Regards, Ryan.
$400 USD in 7 days
0.0
0.0

We recently helped a tech startup achieve streamlined security enhancements. We can do the same for you, with your Full Stack Developer project. I noticed you need a proactive developer with a security mindset, and that is not something every freelancer gets right. It matters, and we take it seriously. We handle full-stack development and security enhancements end to end, and we have completed several projects just like this one. Feel free to message me, I will share some examples of similar projects we have completed, and we can have a quick chat about the project. The worst that happens is you walk away with a free consultation if we decide to not take on the project. Regards, Paul.
$400 USD in 7 days
0.0
0.0

Hello, I have extensive experience with the type of project you're proposing. I'd like to discuss this further.
$500 USD in 7 days
0.0
0.0

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