Senior Fullstack Engineer (React, Django)

Stealth Startup; Stockholms kommun; On-site; SEK 900,000 - 1,200,000; Full time

Job summary

Stealth Startup in Sweden seeks a Senior Fullstack Engineer to help build the next generation of an audio-first platform. You’ll work across the stack using React, Django, Python, REST/OpenAPI, WebSockets, and cloud tooling to deliver features quickly.

You’ll shape what we build, own end-to-end delivery, and ship small changes today in a small team that values speed and practical impact. Experience with audio processing is a plus, but we’ll teach you if needed.

Qualifications

• What you’ve built: web apps across the stack with React and Django or similar Python framework.
• Strong in React and Django; clean, readable code with attention to latency, UX, and details.
• Hands-on, self-driven and comfortable owning features end-to-end; able to ship small changes today.
• Audio processing experience (Web Audio API, DSP basics, codecs, streaming) is a plus but not required.

Responsibilities

• Build and run web applications across the stack with a focus on performance and UX.
• Help decide what to build and ship features end-to-end in a small, fast-moving team.
• Collaborate closely with teammates to iterate quickly and deliver value to customers.

Skills

Experience with web apps across stack

Hands-on / self-driven

Latency & UX attention

Tools

React

Django

Python

REST

OpenAPI

WebSockets

Web Audio API

Docker

Kubernetes

Datadog

Sentry

Job description

We’re a team of audio experts solving one of the hardest problems in speech technology.

Real conversations are messy. People interrupt each other, move around, sit at different distances from the microphone, and speak in rooms filled with reverb and background noise.

Most models are trained on synthetic mixtures because high-quality, paired recordings of real conversations are extremely difficult to collect. But models trained on simulated conditions often struggle when they meet the real world.

The solution:

We’ve built technology that captures both the room and the individual speakers at the same time.

That has given us something rare: a proprietary dataset of real conversations with the reference signals needed to train and evaluate a new generation of speech enhancement, separation, dereverberation, and spatial audio models.

The role:

We’re looking for an exceptional Senior Fullstack Engineer to help us build the next generation of that experience.

You’ll also help decide what we build, not only how we build it. We’re a small team, so your work can reach customers within days rather than quarters.

• React and TypeScript
• Python and Django
• REST, OpenAPI, and WebSockets
• Web Audio API and WebAssembly
• Docker and Kubernetes
• Datadog and Sentry

Requirements:

You have at least five years of professional experience building and running web applications across the stack, and you are strong in both React and Django or an equivalent Python framework.

You write clean, readable code and you care about the details users notice: latency, animation, spacing, typography, how something feels when it is dragged, scrubbed or played.

You are hands-on and self-driven, you prefer shipping a small change today to a big one next month, and you are comfortable being the person who decides.

Experience with audio processing is important to us and preferred: the Web Audio API, DSP basics, codecs, streaming or multichannel audio. It is not a blocker for the right candidate; we will teach you the audio if you bring the engineering.