Backend Engineer

Colossus Technologies Group; San Francisco (CA); Hybrid; USD 150,000 - 230,000; Full time

Benefits offered by this job

Equity

Hybrid work model

Job summary

Colossus Technologies Group is seeking a core backend engineer in the SF Bay Area. You will design, build, and scale services behind our security-focused AI platform, working directly with the founders.

Expect ownership of features end-to-end as the platform grows for enterprise customers. You’ll contribute across the stack with TypeScript/Node.js and Python, sharpen data models in PostgreSQL, and build secure, scalable services capable of processing large enterprise data.

Qualifications

• Proven backend experience building production-grade services.
• Strong TS/Node.js and/or Python skills in real projects.
• Solid relational database knowledge, PostgreSQL preferred.

Responsibilities

• Design and build scalable backend services and APIs.
• Own features from design through production in a growing platform.
• Collaborate with founders, product, and customers to shape the product.
• Develop data models and optimize performance in PostgreSQL.
• Integrate with Azure and Microsoft 365 to analyze access risk.
• Set engineering standards and contribute to architecture decisions.

Skills

Backend software engineer

TypeScript/Node.js

Python

PostgreSQL

Startup experience

Builder’s mindset

Tools

NestJS

Azure

Microsoft 365

PostgreSQL

Python

Job description

Location: SF Bay Area (hybrid, 2–3 days a week on-site)

Employment type: Full-time, direct hire

About the company

Our client is a venture-backed AI security startup that recently raised a new funding round from top-tier security investors. Its founders came from a leading AI-native security company. The platform helps enterprises adopt AI tools like Microsoft Copilot and AI agents safely, by finding and fixing what those tools can access that they shouldn’t. Every security team is dealing with this problem right now, and this company is building one of the main products for it.

The role

You’ll be a core backend engineer on a small team, working directly with the founders. You’ll design, build, and scale the services behind the product, and you’ll own features from design through production as the platform grows with enterprise customers.

What you’ll do

• Design and build scalable backend services and APIs in TypeScript (NestJS) and Python
• Build integrations with Microsoft Azure and Microsoft 365 to analyze permissions, data exposure, and AI access risk
• Design data models and optimize performance in PostgreSQL
• Build services that process large amounts of enterprise data reliably and securely
• Work with the founders, product team, and customers to turn security problems into product features
• Help set engineering standards, architecture decisions, and best practices as the team grows

What we’re looking for

• Strong hands-on experience as a backend software engineer building production systems
• Proficiency in TypeScript/Node.js and/or Python
• Solid experience with relational databases, ideally PostgreSQL
• Startup experience: you’re comfortable with ambiguity and with owning your work end to end
• A builder’s mindset: you like shipping product, not just maintaining systems

Nice to have

• Experience with Microsoft Entra ID, Microsoft 365, SharePoint, or Microsoft Graph APIs
• Background in identity, access management, or data security
• Exposure to AI or LLM-driven products
• Experience building enterprise B2B SaaS
• Get in early at a well-funded company in the fastest-growing area of cybersecurity
• Work directly with experienced founders and have real influence on product and architecture
• Competitive base salary plus meaningful equity
• Solve a problem that every enterprise security team is dealing with right now