Senior Full Stack Developer

About the Role We are looking for a Senior Full Stack Developer to join a CommIT team delivering mission-critical systems for a leading financial institution. You will own features end-to-end across the full stack, working in a secure, highly regulated banking environment where reliability, code quality, and disciplined process matter as much as speed. This is a hands-on senior role on a layered enterprise architecture. You will be expected to operate confidently across all tiers — from the React client through to the core banking integration — and to raise the engineering bar for the team. We build with modern, AI-assisted workflows, so developers who are fluent with tools like Cursor and Claude Code will feel at home. Architecture at a Glance You will design and build across a layered banking architecture, understanding the responsibilities and boundaries of each tier and how data and transactions flow through them: Client (React) → BFF (Next.js / JavaScript) → Middleware (.NET / C#) → Core Banking Key Responsibilities • Design, build, and maintain full-stack features end-to-end across the client, BFF, and middleware tiers. • Develop responsive, accessible UIs in React and build the Backend-for-Frontend layer in Next.js / JavaScript. • Implement and integrate middleware services in .NET / C#, connecting to core banking systems and third-party financial APIs. • Write secure, well-tested, maintainable code, with unit and integration test coverage as part of the definition of done. • Work within the bank's SDLC and governance — change management, environment promotion, security and compliance gates, code review, and release control. • Participate in design discussions and code reviews; mentor team members and improve engineering practices. • Collaborate with product, QA, architects, and the client's teams in a delivery-focused, client-facing setting. Requirements Must-Have Qualifications • 5+ years of professional full-stack development experience. • Front-end: strong React, including modern patterns, state management, and component architecture. • BFF / JavaScript: hands-on experience building Backend-for-Frontend layers with Next.js (Node / JavaScript / TypeScript). • Middleware: solid .NET / C# development, building services and integrations. • Layered architecture: proven experience designing and developing across a Client → BFF → Middleware → Core structure, with a clear grasp of each tier's responsibilities and boundaries. • Banking / regulated SDLC: experience working within a bank's (or comparable regulated enterprise's) software development lifecycle — formal change management, security and compliance gates, and release governance. • Testing: strong testing discipline with hands-on unit and integration testing using NUnit (.NET) and Jest (JS/TS). • Fundamentals: REST APIs, relational databases (e.g. SQL Server / Oracle / PostgreSQL), Git, and CI/CD pipelines. • Messaging / event-driven: hands-on experience with messaging and event-streaming tools such as RabbitMQ and Kafka, and asynchronous integration patterns between services. • State machines: deep knowledge of state machine design and implementation for modeling complex, multi-step workflows and transaction lifecycles. • Security mindset: writes with security and data sensitivity front of mind, appropriate to a banking context. • Communication: strong verbal and written English; effective in a collaborative, client-facing delivery environment. Advantages • Banking / financial domain depth — prior experience with core banking, payments, or other financial systems. • AI-assisted development — hands-on experience with tools such as Cursor or Claude Code (ideally 1+ year). A meaningful plus on this team. • Cloud & modern infra — AWS, microservices, containers (Docker / Kubernetes). • Local context — familiarity with the Israeli banking landscape and Hebrew.