Senior Full-Stack Developer- Next.js/TypeScript (SaaS Product)

Engagement Details & Flexibility

• Role Type: Contract / Freelance / Part-Time or Full-Time
• Commitment: 20 to 40 hours/week (Open to candidates who can commit a minimum of 4 hours daily)
• Working Hours: Flexible working setup with a regular overlap during 9:00 AM 2:00 PM US Pacific Time (PT) for syncs and collaboration.
• Onboarding: Starts with a well-scoped paid trial project (approx. 10–15 hours) to establish collaborative alignment before transitioning into a long-term engagement.

Core Responsibilities

• Feature Engineering: Design and build core comparison logic that processes structured data against reference records to highlight key insights, variances, and gaps with source-level provenance.
• Data Processing Workflows: Develop document ingestion pipelines (PDFs, structured text) featuring page-level citation extraction and automated validation checks.
• Architecture & Multi-Tenancy: Implement robust backend architecture using PostgreSQL, incorporating multi-tenant isolation, structured version control, dynamic role-based access control (RBAC), and authentication.
• AI & Search Integration: Integrate LLM APIs for structured extraction and optimize vector search capabilities (Pinecone) to deliver accurate, reliable platform outputs.
• System Quality & Delivery: Maintain automated test suites (Vitest, Playwright), refine CI/CD pipelines (GitHub Actions), and ensure smooth release deployments on Vercel.

Technical Stack

• Frontend/Backend: Next.js 15 (App Router), React, TypeScript (strict mode)
• Database & Auth: PostgreSQL, Multi-tenant schemas, SSO/SAML/OIDC patterns
• Testing & Infrastructure: Vitest, Playwright, GitHub Actions CI, Vercel
• AI & Search: Pinecone vector index, LLM API integration

Candidate Profile & Qualifications

• Experience: 5+ years of professional full-stack web application development in production environments.
• Core Expertise: Deep mastery of TypeScript and React / Next.js.
• Domain Modeling: Hands-on experience with typed domain modeling, state machines, and enforcing business rules through robust type systems.
• Code Maintenance & Refactoring: Proven ability to navigate, modernize, and enhance existing production codebases.
• Track Record: Successfully launched or contributed significantly to deployed, user-facing web applications.
• Communication: Excellent written English skills with a self-directed, result-oriented approach to execution.

How to Apply

To help us evaluate your profile efficiently, please submit the following with your application:

1. Portfolio/Work Samples: Links to 2–3 web applications or projects you have developed, highlighting your personal technical contributions.

2. Code Sample: A link to a public repository or code sample demonstrating your TypeScript domain layer structure.

3. Availability & Rates: Your hourly rate and daily availability within US Pacific hours.

4. Short Case Study: A brief paragraph highlighting an instance where you inherited an existing codebase, identified an area for improvement, and successfully optimized it.