Engineer III - Full stack - Python/Django + Typescript on AWS (Columbus)

Onsetto, Inc • Columbus, OH

25d • $130,000 - $180,000 • Hybrid

About The Position

At Onsetto, we're building more than technology, we're building the future of business banking. Trusted by financial institutions across the country, Onsetto is helping banks grow deposits, win operating relationships, and transform how they serve businesses. Following our recent $9 million seed funding round, we're entering an exciting new phase of growth and looking for ambitious, entrepreneurial people who want to help shape what comes next.

This role is for engineers who can independently own meaningful parts of a system. As an Engineer II, you are expected to move beyond execution and take responsibility for how systems behave in production. You will design, build, and improve services while owning their reliability, performance, and long-term maintainability. You will work across backend systems, infrastructure, and reliability, with increasing responsibility for decision-making and system design. We operate at the intersection of AI systems running in real production environments and regulated financial systems requiring auditability and control. What we build must work consistently, under real constraints, at scale.

Requirements

• 5 or more years of experience building production software systems
• Strong proficiency in at least one backend language (Python preferred)
• Experience designing and building APIs and working with databases
• Solid understanding of system design fundamentals (scalability, reliability, failure modes)
• Ability to debug across layers (application, infrastructure, data)
• Demonstrated ownership of systems or major features
• Comfort working in environments with real operational constraints

Nice To Haves

• You have owned a system or service in production
• You proactively identify and fix reliability or performance issues
• You think in terms of tradeoffs, not just implementation
• You improve systems beyond your immediate scope
• You use tools (including AI) to increase speed without sacrificing quality
• You help raise the bar for those around you

Responsibilities

• Design, build, and maintain backend services and APIs
• Own specific systems or components, including their reliability in production
• Debug complex issues across services, infrastructure, and data flows
• Improve system performance, scalability, and fault tolerance
• Contribute to CI/CD pipelines, deployment processes, and release quality
• Use LLM tools effectively to accelerate development while maintaining quality
• Participate in incident response and lead root cause analysis efforts
• Collaborate with product and engineering to define clear, testable solutions
• Contribute to system design decisions and technical tradeoffs

Benefits

• Flexible PTO
• Medical, dental, and vision coverage for eligible employees
• Access to HSA plan options
• Paid parental leave

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed