Engineer III Full Stack Backend Mostly

Engineer III, Full-stack - Mostly Backend

Location: Columbus

Reports To: EVP Engineering

About Onsetto

Onsetto is building a white label, AI powered platform that simplifies and accelerates commercial bank account switching. We help financial institutions win more business, grow deposits, and establish primacy by automating complex AR, AP, and payroll transitions with bank grade reliability.

Because we automate mission critical financial workflows for banks, our backend systems must be secure, scalable, and architected for long term growth.

About the Role

We are seeking a senior backend engineer to take ownership of core platform services, support the Banker Portal, maintain and improve our LLM driven workflows, and reduce dependency on senior leadership for day to day technical execution.

This role requires strong architectural judgment, hands on coding ability, and the ability to build production grade systems that support financial institutions.

Key Responsibilities

Backend Architecture and Development

Design, build, and maintain scalable backend systems using Python and Django

Own core services, APIs, and SDK development

Lead database schema design and performance optimization

Improve system reliability and long term maintainability

Banker Portal Support

Build and maintain backend services supporting banker facing workflows

Ensure secure handling of financial and customer data

Collaborate with frontend engineers on API contracts and system integration

LLM and Automation Systems

Maintain and improve LLM driven workflows and automation pipelines

Optimize data processing and prompt orchestration logic

Ensure AI powered features are reliable, auditable, and production ready

Performance and Scalability

Identify and resolve bottlenecks in database and service layers

Improve background job processing and task orchestration

Design systems that scale with growing bank adoption

Collaboration and Leadership

Take ownership of complex technical initiatives

Reduce workload burden on senior engineers and leadership

Mentor junior engineers where appropriate

Contribute to architectural decision making and code review standards

Required Qualifications

5 plus years of backend engineering experience

Strong proficiency in Python and Django

Experience designing and building RESTful APIs

Solid database design experience with relational databases

Experience building production systems that handle sensitive data

Experience and ability to program with React / Typescript as needed

Preferred Qualifications

Experience integrating AI or LLM based systems into production applications

Familiarity with React based frontend integration

Experience in financial services or regulated environments

Exposure to AWS infrastructure and cloud architecture

What Success Looks Like

Core backend systems are stable, scalable, and well documented

Reduced technical dependency on founders for implementation details

Clean API design supporting banker workflows

Improved performance and reliability across services

Why Join Onsetto

You will play a critical role in building the technical backbone of a banking infrastructure platform. Your work will directly support financial institutions in growing deposits and strengthening client relationships, while shaping the long-term architecture of the company.