Senior Developer & Software Architect for AI Video SaaS (Next.js / TypeScript / Postgres)

We're a Luxembourg-based media & SaaS company building 360Matrix, a product that turns raw video interviews into dozens of ready-to-publish assets (clips, shorts, articles, translations, optimized videos). The product is built in-house with AI-assisted development and is moving toward production. We're looking for a senior developer / software architect to be the technical right hand on this codebase: own the architecture decisions with us, keep quality high, and get hands-on where it counts as we scale toward launch. What you'll do Architecture: own the big technical decisions with us — data model, API design, auth, billing, scaling the AI pipeline Quality: look over the code we ship, catch bugs, security issues and risky patterns before they reach production Hardening: help take the app production-ready (security, error handling, secrets, observability, CI/CD) Hands-on when needed: step in directly on tricky modules — pipeline orchestration, GPU inference, multi-tenant logic, performance bottlenecks Direction: short calls to settle bigger design questions and set the technical roadmap The stack Frontend / Backend: Next.js 14 (App Router), TypeScript, API routes Database: PostgreSQL 16 + Prisma ORM Auth: JWT (jose) + bcrypt, HTTP-only cookie sessions, ~20 social OAuth providers (Google, Apple, LinkedIn, TikTok, Instagram, etc.) Infra: Railway (Nixpacks build), Cloudflare DNS, Resend (email) AI pipeline: Whisper / Deepgram (ASR), Claude Sonnet (scripting, rewriting, AI captions), FFmpeg + Remotion (assembly + rendering) Orchestration: Inngest for the AI pipeline, RunPod Serverless for GPU inference (vision, face detection) Lip-sync / dubbing: HeyGen today; self-hosted alternatives (MuseTalk, Wav2Lip, XTTS) being evaluated for cost reduction — not yet integrated Other: token-based billing (Discover/Pro/Enterprise plans), multi-tenant enterprise workspaces, beta-invite system What we're looking for Senior-level, production experience with Next.js + TypeScript Strong on PostgreSQL/Prisma and API/auth security Comfortable with serverless/managed deployment and event-driven orchestration (Inngest, queues, background jobs — or equivalent) Bonus: AI/ML video or audio pipelines, FFmpeg/Remotion, GPU inference (RunPod or similar) You think in systems: you can look at a codebase and say what to keep, what to refactor, and why Direct, specific, respectful communication — you explain the trade-offs Reliable async work with predictable turnaround