Full-Stack Engineer for SaaS Finalization

Cliente Freelancer · Remoto · Remoto · freelance · mid

Publicada el 2026-07-21

Descripción de la oferta

Senior Full-Stack Engineer to Finish and Productionize Existing SaaS React + TypeScript + FastAPI + PostgreSQL + Azure + OpenAI About the project Operation MOS is a live SaaS product helping veterans translate military experience into civilian résumés, job applications, LinkedIn content, ATS-tailored résumés, and interview preparation. This is not a greenfield build and not a “vibe code a new app” job. The core product is already built and deployed. I need a senior engineer who can take ownership of the finish line: validate what works, fix demonstrated issues, simplify duplicate paths, polish the remaining modules, and safely productionize counselor and enterprise workflows. We have a detailed discovery package, product inventory, diagrams, prioritized backlog, deployment runbooks, and existing test coverage ready for the right candidate. Current stack - Frontend: React, TypeScript, Vite, Tailwind - Backend: Python, FastAPI, Pydantic, SQLAlchemy - Data: PostgreSQL, Redis, Azure Blob Storage - Infrastructure: Azure App Service/container deployment, GitHub Actions - AI/document workflows: Azure OpenAI/OpenAI, GPT-5 mini and GPT-4.1 nano, PDF parsing and OCR - Product areas: résumé builder/export, FITREP/EVAL import, ATS tailoring, LinkedIn tools, interview prep, counselor dashboard, enterprise dashboard, admin operations What I need you to own 1. Learn the existing system quickly - Review the discovery package, architecture, backlog, deployment process, and test suite. - Validate current production/staging behavior before changing it. - Identify real bugs versus stale findings, feature flags, or intentional pilot limitations. 2. Finish and harden the product - Improve the veteran journey where evidence shows friction. - Finish/polish the counselor and enterprise dashboards. - Strengthen loading, error, retry, empty, and recovery states. - Consolidate duplicate or legacy paths only when justified by evidence. - Improve maintainability around large React screens without proposing a rewrite. 3. Own production-quality engineering - Write focused tests at the right layer: unit, API contract, and browser only when useful. - Protect role-based access, tenant isolation, PII, consent, secure file handling, and auditability. - Work safely with Azure configuration, feature flags, migrations, staging deployment, rollback, logging, and monitoring. - Treat AI quality, latency, token usage, and cost as product requirements. 4. Create a clean handoff - Small, reviewable PRs. - Clear release notes, test evidence, screenshots where relevant, and rollback notes. - A prioritized recommendation for what to ship, pilot, gate, defer, or remove. Required experience - Strong production React + TypeScript experience. - Strong Python/FastAPI and PostgreSQL experience. - Experience with Azure or comparable cloud deployment/operations. - Experience with authentication, RBAC, multi-tenant SaaS, PII/security-sensitive workflows. - Experience integrating and evaluating OpenAI/Azure OpenAI or similar LLM systems. - Comfortable working in an existing codebase with imperfect documentation. - Strong written English and proactive communication. - Able to explain technical tradeoffs to a non-traditional technical founder. Nice to have - Document extraction/OCR/PDF generation experience. - Accessibility and responsive UX experience. - Veteran, workforce-development, education, nonprofit, HR-tech, or enterprise SaaS experience. - Experience taking an MVP through a controlled pilot into a reliable production product. Important constraints - No rewrite proposal before you have reviewed the system and produced evidence. - No production changes without staging validation and rollback awareness. - No shortcuts around security, tenant isolation, PII, consent, or test coverage. - This may become an ongoing engagement if the first phase goes well. Paid first milestone Start with a paid 8–12 hour technical takeover and execution plan. You will receive the existing discovery package. Your deliverable is: - Your understanding of the architecture and product state. - The top 5 verified risks/opportunities. - Your recommended first two weeks of work. - A proposed first PR scope: small, measurable, testable, and reversible. - Questions or missing access/documentation you need answered. Please include in your proposal 1. A short example of a SaaS product you inherited and improved. 2. Your hands-on experience with React/TypeScript, FastAPI/Python, PostgreSQL, Azure, and LLM integrations. 3. How you would approach an existing 3,000+ line dashboard component without risking a rewrite. 4. Your weekly availability, time zone, hourly rate, and earliest start date. 5. The phrase “evidence before rewrite” at the top of your response so I know you read this post. I will prioritize candidates who can show relevant shipped work, communicate clearly, and propose a disciplined first milestone instead of promising to rebuild everything.

Skills

Fuente original: freelancer

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