Senior Product Engineer

Realmforge AI; København; On-site; DKK 700,000 - 900,000; Full time

Job summary

Realmforge AI is hiring a Senior Product Engineer to own the platform around the narrative engine, including delivery systems, creator tooling, and infrastructure. You will work on real-time AI-generated narratives, large catalogs, media storage and delivery, search, caching, and performance.

You’ll collaborate with creators to design characters, settings, and story elements that the AI brings to life. The role emphasizes strong product engineering with autonomy, end-to-end ownership, and focus

Qualifications

• Strong TypeScript, React, and Next.js experience.
• Node/TypeScript backend services and APIs.
• Back-end fundamentals: data modeling, queues, async jobs.
• Fluent with Python reading/writing.
• Experience with coding agents or AI-assisted development is a plus.

Responsibilities

• Own platform around the narrative engine: delivery systems, creator tooling, and infrastructure.
• Build real-time delivery, large catalogs, storage and search, caching, and query performance.
• Develop creator tooling for designing characters, settings, and story elements.

Skills

TypeScript

React

Next.js

Node.js

Python

AI tooling / agents

Job description

Build the platform the stories run on

Hey I'm Erik (CTO). My background is in ML and computer vision (PhD, Google Research / DeepMind), and I've been a narrative RPG gamer most of my life.

I'm hiring a Senior Product Engineer to join our engineering team of three. My focus is the core narrative engine—the AI that tells coherent stories. This role owns the platform around it: the systems that deliver those stories to players, the tools creators build with, and the infrastructure that keeps it reliable, scalable, and built right.

You own everything around the narrative engine: the systems that deliver stories to players, the tools creators build with, and the infrastructure that keeps it standing.

You don't need ML, LLM, or AI research experience. We want a strong product engineer.

What you'll work on

Six things on your plate (at least)

• Platform architecture
• Real-time delivery of AI-generated narrative: closer to a media platform than a SaaS app. Large catalogs, media storage and delivery, search, caching, and query performance.
• Creator tooling: Tools for creators to design characters, settings, and story elements the AI brings to life.
• Payments and subscriptions: Plans, paywalls, entitlements, failed payments, and refunds.
• Orchestrating third-party APIs that are slow, expensive, or unreliable: Retries, fallbacks, caching, and graceful failure.
• Monitoring and operations: Deploys, alerting, tracing, production debugging, performance, and cost work.
• Engineering foundations: Code review, CI, testing culture, and a CI/CD setup we can iterate on quickly.

Who you are

• 4–5+ years, hands-on. Senior enough to work unsupervised and to have seen good engineering practice up close, while still writing code every day.
• A finisher. You talk about what you shipped and maintained, not what you started.
• Autonomous. You don't need work broken down for you, you don't go quiet for a week, and foundational calls with no playbook energise you.
• You measure things. You want numbers on how the product is used and what it costs to run before deciding.
• You care about user experience. A janky transition bothers you, and you treat the designer as a partner rather than silently improvising.
• Communicative. You flag problems early and disagree openly.
• Technical skills
• Strong TypeScript, React, and Next.js, with depth and repeated use.
• Node / TypeScript backend services. This is where most of the backend work sits.
• Backend fundamentals: data modeling, API design, async jobs, queues, and background processing.
• Agentic engineering: fluent with coding agents such as Claude Code, Cursor, and Codex. We want to leverage AI without shipping slop.
• Comfortable reading and writing Python.

Nice to have

None of these are required.

• Consumer products with real users: media, streaming, entertainment, games, creative tools, or marketplaces.
• Subscription businesses: billing, paywalls, and entitlements.
• Realtime systems: reactive backends such as Convex, Firebase, or Supabase; SSE; websockets; and live-updating interfaces.
• Audio or video pipelines: encoding, storage, CDN, and playback.
• Analytics and experimentation: event tracking, funnels, A/B testing, and feature flags using tools such as PostHog, Amplitude, Mixpanel, or Segment.
• Experience as an early hire at a company that then grew, or on small teams with broad ownership.
• Polished, design-led interfaces. Send links or screenshots.
• Side projects that show initiative: open source, game jams, or interactive fiction.

We don't waste your time

We read every application ourselves and respond with a decision within two weeks.

How we hire

• Intro call with Vansh (CEO)—20 minutes about you, us, and what you want next.
• Intro call with Erik (CTO)—20 minutes about your engineering background.
• Live coding session—one hour working on something real together.
• Meet us in person—over food and drinks, then we decide.