Software Engineer Brazil

At Domu.ai, we're building the agentic infrastructure for the future of the world's largest financial institutions. AI agents that handle millions of live interactions every day for Fortune 500 banks and insurers, end-to-end. Interactions are 3x-ing monthly. We're hitting problems most startups never encounter: real-time voice AI at scale, legacy banking infrastructure, enterprise telephony, and building regulatory frameworks in the US.

The role

As the Software Engineer you'll.....

• Build and own core product features: Backend systems, APIs, voice infrastructure, wherever the product needs you. Code ships daily and goes live for Fortune 500 clients.
• Work on things most engineers never touch: telephony systems, real-time voice processing, and integrations with legacy financial infrastructure. The problems are hard. That's the point.
• 95%+ of your time will be coding and building.
• We're looking for engineers who can own one of these areas: the orchestration layer that coordinates our voice AI systems, infrastructure scaling and low-level performance, security as a generalist building for Fortune 500 financial institutions, or product engineering close to users finding high-leverage wins.
• Know what it feels like when things are working: real customers, real revenue, a product people actually need. You also know the chaos, the pace, the things that break at the worst possible time. You've seen both sides and you want to do it again with a team that's already found traction.

Why Domu

• Real traction. Post $XXM in revenue, Fortune 500 customers, 12x YoY growth. This isn't a bet on an idea. The product works and customers are paying for it.
• You'll learn how enterprise deals work from an engineering seat. You'll see the direct line between your code and revenue.
• AI First company with $1M+ revenue per employee.
• Early enough to shape the product, the team, and the culture.

How we work

• We do dailies. We groom tickets. But we keep process light and in service of the work, not the other way around. We'd rather spend time building than talking about building.
• We care about doing great work. Not just shipping, but shipping something you're proud of.
• Ownership here is real. You won't be handed tasks from a backlog. You'll see what needs to happen and do it. That's how a small team ships to Fortune 500 customers.
• We hire people whose judgment we trust, then get out of their way. No passengers.

What you bring

• 3+ years of experience as a software engineer
• Previously worked at a Series A (or similar stage) startup and went through the same hypergrowth challenges Domu is facing
• Experience dealing with legacy systems and refactoring them into sustainable, scalable architectures
• Strong backend fundamentals - can own features end-to-end from design to production
• Proficiency in TypeScript and/or Python

Extras we'd be excited about

• Telephony/Voice infrastructure - SIP, SRTP, WebRTC, or platforms like Telnyx, Twilio, LiveKit
• High-throughput distributed systems - queue workers, event-driven architectures, handling 1M+ daily transactions
• PostgreSQL at scale - query optimization, replication, connection pooling
• Kubernetes - production deployments, scaling stateful services
• Real-time data pipelines - ClickHouse, Kafka, or similar OLAP/streaming solutions
• AWS infrastructure - SQS, containerized deployments
• Compliance-conscious environments - SOC 2, ISO 27001, or fintech/enterprise security requirements
• Experience with AI/ML integrations in production (LLMs, voice AI)
• Familiarity with contact center / dialer systems
• You've been through the early stages of a startup before.
• You care about the craft. You want to build something good, not just something that works.

Ideal archetypes:

• Head of Eng / Tech Lead at a Series A/B startup (5–20 engineers), built and scaled core infra from scratch
• Senior Engineer who was one of the first 10 hires and is ready for that feeling again
• Founding Engineer through Series B/C, owns systems end-to-end, wants a new zero-to-one challenge
• Staff Engineer at a Series C/D slowed by process, wants to move fast again
• Repeat startup engineer, 2–3 stints, specifically seeks small teams with hard problems

What we offer

• Healthcare
• weekly stipend for food and transportation
• gym membership
• equipment budget (strict rules on noisy mechanical keyboards)
• whatever tools you need

Interview Process

1. Interview with Head of Engineering (Kai)
2. Technical screening
3. Technical take-home challenge
4. 1 hour interview with another 2 engineers
5. Paid trial