Founding Software Engineer

SupportFinity™; San Francisco (CA); On-site; USD 180,000 - 280,000; Full time

Job summary

Kalos in San Francisco is seeking a founding engineer to shape product, culture, and the company’s trajectory. This is a full-time, in-person software engineering role at Kalos HQ, where you’ll influence the technical stack, roadmap, and architecture.

You’ll build new features from 0 to 1, own end-to-end delivery, mentor an early team, and collaborate with the founders on product vision while embracing a fast-paced, performance-driven startup environment.

Qualifications

• 4-10 years experience building software with a strong track record and ability to work full-stack.
• Startup mindset — resourceful, sharp, and entrepreneurial, who is excited to take early ownership.
• Love to move fast, to learn, and to always-be-improving.
• Experience using LLMs in production and interest in staying at the cutting edge of AI.
• Experience in designing and building scalable systems. Knowledge of modern software engineering practices and frameworks.
• You care deeply about users and love shipping polished, impactful work.
• Strong product intuition — you think beyond the code.

Responsibilities

• Build new features 0 -> 1 fast and iterate based on customer feedback.
• Own and ship core product features end-to-end across our AI agent, integrating LLMs and building workflows to deliver great UX.
• Collaborate directly with the founders on product vision, roadmap, and architecture.
• Lay the foundations for engineering culture, tooling, and processes.
• Help build and mentor the early team as we scale.

Skills

Full-stack development

Startup mindset

LLMs in production

System design

Product intuition

User-focused shipping

Job description

Company Description

Kalos is an early stage, high-growth startup based in San Francisco, CA. We built Blue – an AI Agent that is the world's best performance marketer. Blue works 24/7 to build and optimize ad campaigns to help our customers grow faster.

We are 5 people, and you'd be #6 on the team. Our early customers include well-known Silicon Valley tech companies, including multiple unicorns. We have more demand than we've been able to service. We're hiring on many fronts and it's time to go faster.

Role Description

As a founding engineer, you won’t just write code — you’ll help shape product, culture, and the trajectory of the company. You'll have an important voice in our technical stack, direction, and vision.

This is a full-time Software Engineering role. The current team is in San Francisco, and this role is in person at Kalos HQ.

We work hard and we know we're building a generational company. If you're looking for the ride of a lifetime, this might just be what you're looking for.

What You'll Do

• You will build new features 0 ->1 fast and iterate across our product based on customer feedback
• Own and ship core product features end-to-end across our AI agent, integrating LLMs and building workflows to delivering great UX
• Collaborate directly with the founders on product vision, roadmap, and architecture
• Lay the foundations for engineering culture, tooling, and processes
• Help build and mentor the early team as we scale

Qualifications

• 4-10 years experience building software with a strong track record and ability to work full-stack
• Startup mindset — resourceful, sharp, and entrepreneurial, who is excited to take early ownership
• Love to move fast, to learn, and to always-be-improving
• Experience using LLMs in production and interest in staying at the cutting edge of AI
• Experience in designing and building scalable systems. Knowledge of modern software engineering practices and frameworks
• You care deeply about users and love shipping polished, impactful work
• Strong product intuition — you think beyond the code

About the company

Multiply