Senior Backend Software Engineer

United States Digital Space LLC; Seattle (WA); Hybrid; USD 113,000 - 197,000; Full time

Benefits offered by this job

Equity

Job summary

United States Digital Space LLC seeks a Senior Backend Software Engineer in Seattle, hybrid, full-time. You’ll own real-time voice workflows, build scalable SIP/RTP handling, and drive latency‑sensitive pipelines within a small foundational team.

The role covers architectural decisions for greenfield projects and integration of TELOPHONY tech on AWS, with TypeScript/Node.js and Python as core stacks.

Qualifications

• Greenfield backend role building next-gen voice products from scratch.
• The team will make early architecture decisions and shape platform design.

Responsibilities

• Build next-gen voice products from scratch.
• Make early architecture decisions for greenfield services.
• Work on real-time telephony stack and latency budgets.

Skills

Real-time media handling

STT/TTS pipelines

Speaker verification

Deepfake detection

Conversations AI

Tools

Docker

Kubernetes

Kafka

AWS

TypeScript/Node.js

Python

SIP/RTP

Job description

the company | Senior Backend Software Engineer | Seattle, WA | HYBRID | Full-time | $113-197k + equity

the company's Voice Intelligence Platform protects 500M+ users from spam, fraud, and deepfake scam calls, and gives businesses branded, verified caller ID so the calls that matter get answered.

We're hiring a senior backend engineer for a small foundational team building our next-generation voice products from scratch: real-time SIP/RTP media handling, STT/TTS pipelines with tight latency budgets, deepfake detection and speaker verification, and conversational AI, all integrated directly into carrier networks. It's greenfield, so you'll be making the early architecture decisions, not maintaining legacy services.

Stack: TypeScript/Node.js, Python, Kafka, Docker/Kubernetes on AWS. Telephony experience (SIP, RTP, WebRTC) is a plus, not required. Team is distributed across Seattle and Europe, async-first; 3 days/week in the Seattle office.