Senior Founding Full Stack Engineer

United States Digital Space LLC

United States

Remote

USD 160,000 - 175,000

Full time

14 days+

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Benefits offered by this job

Remote friendly

Equity package

Job summary

United States Digital Space LLC in the United States is seeking a senior full stack engineer who can move fast, build hard things, and help us stay ahead as we deepen integrations across the CRM ecosystem.

You will own meaningful surface area across our stack, ship end-to-end features, improve CI/CD and testing, and build AI-powered capabilities, including LLM integrations and vector search, with CRM partners like HubSpot, HighLevel, and Close.

Qualifications

Proficient with Next.js, React, and Node.js in production.
Experience with AI applications, including LLM integrations and model APIs.
Excellent SQL skills with complex queries.
Experience integrating with third-party APIs, especially CRMs.
Familiar with CI/CD, DevOps, and testing.

Responsibilities

Own meaningful surface areas across our stack and ship end-to-end features.
Improve CI/CD, DevOps, and test coverage.
Optimize backend algorithms powering routing and delivery.
Build AI-powered capabilities and integrations with CRM partners.
Prototype and ship production integrations quickly.

Skills

Next.js

React

Node.js

AI integrations

SQL

Amplitude

CRM integrations

DevOps/CI-CD

Testing

Tools

Docker

AWS/GCP

CI/CD pipelines

Job description

About the company

We are the iMessage and SMS marketing platform trusted by 3,000+ sales teams, installed in 4,300+ HighLevel accounts and integrated with HubSpot, Close, and other top CRMs. Our customers double their response rates and skip the A2P compliance headache entirely. We have helped generate $2M+ in revenue for the teams we serve, and we are scaling fast.

We are looking for a senior full stack engineer who can move fast, build hard things, and help us stay ahead as we deepen integrations across the CRM ecosystem.

What you will do

You will own meaningful surface area across our stack. That means shipping new full stack features end to end, sharpening our DevOps and test coverage, optimizing backend algorithms that power message routing and delivery, and building AI powered capabilities (think voice cloning, AI voice memos, intelligent message optimization).

As we expand integrations with HubSpot, HighLevel, Close, and new CRM partners, you will be the engineer who can pick up an unfamiliar API on Monday and ship a production integration by Friday.

What we are looking for

Strong proficiency with Next.js, React, and Node.js in production
Hands on experience building AI applications, including LLM integrations, prompt engineering, working with model APIs, vector search, or similar
Excellent SQL skills. You can write, debug, and optimize complex queries without flinching
Experience working with Amplitude for product analytics, event tracking, and turning data into product decisions
A track record of building and integrating with third party APIs, especially CRM platforms (HubSpot, HighLevel, Close, or comparable)
Comfortable across the stack: shipping features, improving CI/CD and DevOps, writing meaningful unit tests, and tuning backend performanceFast learner who thrives in a fast moving environment where the integration list keeps growing

Nice to have