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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Engineer - **Company:** Infinity Constellation Inc. - **Location:** New York, NY, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Admin Tools, Application Programming Interfaces (APIs), Artificial Intelligence, JIRA, User Authentication, Software as a Service, Encodings, Python (Programming Language), PostgreSQL, Node.Js, Next.js, ReactJS, Large Language Models, Prompt Engineering, Zapier, Backend, Fastapi, Stripe, Nintex, Graphql, Front End Software Development, Webflow, Automation Anywhere - **Published:** September 4, 2026 - **Apply:** https://startup.jobs/senior-full-stack-engineer-radiance-infinity-8135955 ## About the Role * 6-12+ years experience in engineering, product, or technical architecture roles * Experience building platforms or internal systems from zero to v1 (or beyond) * Strong product intuition: you think in systems, not features * Comfort working in ambiguity with evolving requirements * Ability to translate non-technical needs into technical solutions * Pragmatic, opinionated, and execution-focused * Experience with modern web stacks, APIs, automation, and AI tooling * Bias toward leverage, simplicity, and compounding value MUST-HAVE HARD SKILLS (Non-Negotiable) 1. Full-Stack Web Development (Production-Grade) * Frontend: React / Next.js (or equivalent modern framework) * Backend: Node.js / Python (FastAPI preferred) or similar * REST + basic GraphQL understanding * Authentication, permissions, role-based access * Handling real users, real data, real edge cases, * Experience building tools for agencies, creative teams, or knowledge workers * Exposure to AI workflows, LLMs, or automation systems * Experience scaling internal tools into external-facing products * Interest in brand, design, storytelling, or creative systems * Prior founding or early-employee experience, * You want to build systems that compound * You enjoy shaping products from first principles * You care about how humans actually work, create, and decide * You like autonomy and responsibility more than structure * You want equity in what you build ## Description We are looking for a Senior Full Stack Engineer to help architect, build, and evolve The SOURCE® from a powerful internal system into a scalable platform that supports both our agency workflows and future SaaS expansion. This is not a "ticket-taking" role. This is a role for someone who wants to shape the product, the architecture, and the technical philosophy from the ground up. You'll work directly with the founder to translate creative workflows, brand logic, and operational complexity into elegant systems that compound over time. What You'll Do Platform & Product Architecture * Design and own the technical architecture of The SOURCE® * Translate creative, brand, and agency workflows into scalable systems * Build a platform that supports services today and SaaS tomorrow * Make pragmatic decisions about build vs buy vs automate Execution & Systems * Ship fast, iterate often, and prioritize leverage over perfection * Build internal tools that reduce scope creep and operational drag * Integrate AI, automation, and workflow tooling where it actually adds value * Establish technical standards, documentation, and patterns early Partnership & Leadership * Act as a thought partner to the founder on product vision and sequencing * Help define what Radiance should and should not build * Lay the groundwork for future engineering hires and contributors * Own outcomes, not just code, * Designing relational and/or hybrid schemas (Postgres + JSON) * Modeling entities like: + Brands + Assets + Campaigns + Messaging hierarchies + Versions / approvals / history * Understanding how systems evolve without breaking 3. Workflow Automation & Tool Integration * Integrate tools via APIs (Stripe, Jira, Webflow, CMSs, CRMs) * Use automation tools (Zapier, Make, n8n, Temporal, etc.) * Design async workflows (approvals, handoffs, notifications) * Build internal dashboards and admin tools 4. AI / LLM Practical Implementation * Prompt engineering for structured outputs * Embedding LLMs into workflows * Using vector databases (Pinecone, Weaviate, Supabase, etc.) * Designing guardrails for brand voice + consistency * Knowing when NOT to use AI ## Related Videos - [Improving quality with Agentic AI with Rovo Dev and Xray](https://www.wearedevelopers.com/videos/2005-improving-quality-with-agentic-ai-with-rovo-dev-and-xray) - [Navigating Growth, Scaling Challenges, and Office Expansions with David Singleton, CTO at Stripe](https://www.wearedevelopers.com/videos/100362-navigating-growth-scaling-challenges-and-office-expansions-with-david-singleton-cto-at-stripe) - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [Coffee with Developers](https://www.wearedevelopers.com/videos/354-coffee-with-developers) - [Collaboration Quantified: Lessons from Open Source Developer Networks](https://www.wearedevelopers.com/videos/1422-collaboration-quantified-lessons-from-open-source-developer-networks) - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) ## Related Articles - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development) - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)