Senior Full Stack Engineer: iPaaS Integrations

Underdog: Verified engineers. Interview-ready. Searching confidentially. And companies apply to you; United States; On-site; USD 140,000 - 190,000; Full time

Job summary

Underdog is seeking a Senior Full Stack Engineer to architect mission-critical features used by thousands of developers to build, deploy, and scale integrations.

You will own projects end-to-end, from designing APIs to enhancing our low-code interface, mentoring engineers, and collaborating with product teams and customers to solve complex challenges.

Qualifications

• Experience building scalable B2B software integrations.
• Proficiency with TypeScript and React in production environments.
• Experience leading architecture discussions and technical roadmapping.

Responsibilities

• Lead architecture discussions and technical roadmapping for platform features.
• Ship production-grade code across the stack (frontend, backend, infrastructure).
• Collaborate with product and design to translate user needs into technical solutions.
• Mentor engineers and champion best practices (testing, code reviews, documentation).
• Work directly with customers to solve integration challenges.

Skills

TypeScript

React

APIs

Tools

TypeScript SDK/CLI

AWS

Job description

We’re revolutionizing how B2B software companies build and manage integrations. As a leading embedded integration platform (iPaaS), we empower teams from startups to Fortune 100 enterprises to deliver seamless connectivity solutions. Recognized for top-tier customer satisfaction, our engineer-first platform combines a low-code visual builder with robust developer tools, enabling teams to focus on their core product while we handle the complexity of integrations.

The Role

As a Senior Full Stack Engineer, you’ll architect mission-critical features used by thousands of developers to build, deploy, and scale integrations. You’ll own projects end-to-end, from designing APIs to enhancing our low-code interface, directly impacting how businesses connect their software ecosystems.

What You’ll Build

• Integration Tools: Enhance our visual workflow builder and TypeScript SDK/CLI for developers
• Scalable Infrastructure: Optimize systems handling millions of API calls and data transformations
• Developer Experiences: Improve dashboards, documentation, and APIs used by engineering teams globally
• Customer Solutions: Troubleshoot complex integration scenarios with enterprise users
• Frontend: TypeScript, React
• Cloud: AWS

Key Responsibilities

• Lead architecture discussions and technical roadmapping for platform features
• Ship production-grade code across the stack (frontend, backend, infrastructure)
• Collaborate with product and design to translate user needs into technical solutions
• Mentor engineers and champion best practices (testing, code reviews, documentation)
• Work directly with customers to solve integration challenges

Who We’re Looking For

• 6+ years building production systems at scale, preferably in B2B SaaS

Technical Mastery:

• Expertise in TypeScript/React and Python/Django
• Familiarity with cloud infrastructure (AWS) and relational databases

Mindset:

• Thrives in collaborative, fast-paced environments
• Obsessed with code quality and maintainability
• Communicates complex technical concepts with clarity

Bonus Points For

• Experience building SDKs, CLIs, or developer tools
• Background in integration platforms or iPaaS
• Mentorship experience or open-source contributions

Why Join?

🚀 Impact: Shape tools used by thousands to power critical business workflows

💻 Tech Excellence: Work on cutting-edge problems in API orchestration and data pipelines

💰 Compensation: base salary + equity

🏡 Remote Flexibility: Work from anywhere in the US with biannual team gatherings

• 401(k) with 4% company match
• Unlimited PTO + life/disability insurance
• Top-tier hardware and tools
• Build for Builders: Every feature is a developer experience
• Ship to Learn: Iterate fast while maintaining enterprise-grade reliability
• Customer-Centric Code: Solve real problems, not just write clever solutions

Apply Now if you:

• Want to redefine how software integrates at scale
• Love balancing technical depth with product intuition
• Are ready to mentor and lead in a high-growth environment