Senior Full Stack Engineer

Who We Are

At KEV, we build mission-critical financial software for K–12 schools on a massive scale. Our platform delivers real-time control and visibility into every dollar collected, whether cash, check, or digital, replacing fragmented workflows with secure, modern systems. Trusted by 27,000 K–12 schools and districts managing over $8B annually, KEV operates at the intersection of payments, accounting, and reporting—where complexity is high and engineering excellence matters.

Headquartered in Toronto with teams across North America, we are scaling fast and investing deeply in cloud-native, data-driven technology. If you want to build high-impact SaaS products that solve hard problems, scale with purpose, and make your work matter in public education, KEV is the place to do it.

About The Role

At KEV, our engineering teams build and operate mission-critical SaaS platforms that support more than 27,000 K12 schools and over 1 million users across North America. Our systems process and manage high volumes of financial transactions every day, operating at scale in a domain where reliability, security, and correctness are non-negotiable. We are hiring a Senior Developer to help design, evolve, and scale the core systems that power KEV’s financial platform.

In this role, you will work across frontend and backend services to deliver secure, high-performance software that supports complex financial workflows. You will contribute to architectural decisions, system design, and platform evolution as KEV continues to grow. This role requires deep experience building and operating SaaS software at scale.

You will design systems that remain reliable under real-world load, handle sensitive financial data with care, and support distributed architectures as usage grows. You will collaborate closely with Product, Design, and Engineering peers to translate real school needs into scalable, durable solutions that earn long-term trust. This role is for an active vacancy.

How You’ll Contribute Build and Scale Core Systems Design, build, and evolve core services and platform capabilities that support KEV’s SaaS products at scale. Lead system design and architectural decisions, including event-driven patterns where appropriate, to ensure reliable, high-performance systems across complex, high-volume workloads. NET.

Ensure frontend and backend systems are aligned, performant, and built for long-term maintainability. Financial Platform Trust Build and maintain software that processes financial transactions with a strong focus on correctness, traceability, and security. Ensure financial workflows are resilient, failures are handled predictably, and customer trust is protected.

Production Reliability Own the reliability of the systems you contribute to by diagnosing production issues, improving observability, and strengthening operational practices that support stable releases and day-to-day platform health. Data and Performance at Scale Design and optimize relational data models and SQL queries that support high-volume production workloads. Balance performance, data integrity, and maintainability as systems evolve.

Quality Engineering Write clean, maintainable, and well-tested code, applying shift-left practices such as unit and integration testing to catch issues early. Contribute to improving engineering standards, development workflows, and technical decision-making across the team. Cross-Functional Collaboration Partner closely with Product Managers, Designers, and Engineering peers to shape scope, assess trade-offs, and deliver well-defined solutions.

Communicate clearly about technical constraints, risks, and progress to support predictable delivery.

Who You Are

8+ years of professional experience building and operating production SaaS software, wit