Lead Software Engineer - Finance Technology

ON RUNNING; Greater London; On-site; GBP 65,000 - 85,000; Full time

Job summary

A global sportswear company seeks a Senior Engineer to architect and build robust financial solutions that support their global operations. This pivotal role focuses on transitioning to a high-performance, event-driven architecture, leveraging TypeScript, NestJS, and Apache Kafka. Ideal candidates will have extensive backend experience in Node.js and a collaborative mindset to handle financial stakeholder needs. Join us in ensuring that our financial systems are scalable, reliable, and future-proof.

Qualifications

• Extensive experience building backend services specifically with NestJS and Node.js.
• Proven experience implementing Apache Kafka in production environments.
• Proficient in leading technical discovery for migrations.
• Strong track record with Kubernetes, Terraform, and GitHub Actions.
• Technical experience with ERP systems and financial processes is a plus.
• Ability to communicate effectively with technical peers and Finance stakeholders.

Responsibilities

• Architect and build the financial infrastructure that powers global operations.
• Lead transition to a North Star architecture, improving performance and scalability.
• Ensure financial systems are reliable and compliant, leveraging Kafka and NestJS.

Skills

TypeScript Mastery

Streaming Expertise

Logical Problem Solver

Cloud & DevOps Native

Domain Curiosity

Collaborative Partner

Tools

NestJS

Node.js

Apache Kafka

Kubernetes

Terraform

GitHub Actions

Job description

Overview

In short: As a Senior Engineer in the Finance cluster, you will architect and build the technological infrastructure that powers On's global financial operations. You will play a pivotal role in transitioning our finance ecosystem toward a "North Star" architecture — moving away from legacy patterns toward a high-performance, event-driven landscape. At On, we believe everyone in the world should have access to the best sportswear. For this to happen, we need high-performing, robust financial solutions that ensure our global growth is supported by accurate data, compliant processes, and efficient automation across all legal entities. By leveraging Kafka for real-time data streaming and NestJS for robust microservices, you will ensure our financial systems — from global tax compliance to automated bank integrations — are scalable, reliable, and future-proof.

Responsibilities

• Architect and build the financial infrastructure that powers On's global operations.
• Lead the transition to a North Star architecture, moving from legacy patterns to a high-performance, event-driven landscape.
• Ensure scalable, reliable financial systems with accurate data, compliant processes, and efficient automation across all legal entities, leveraging Kafka and NestJS.

Qualifications

• TypeScript Mastery: Extensive experience building backend services specifically with NestJS and Node.js.
• Streaming Expertise: Proven experience implementing Apache Kafka in production environments to handle high-throughput data.
• Logical Problem Solver: Proficient in leading technical discovery and breaking down big migrations into manageable, iterative releases.
• Cloud & DevOps Native: Strong track record with Kubernetes, Terraform, and automating deployments through GitHub Actions.
• Domain Curiosity: Technical experience with ERP systems (D365 F&O) and financial processes such as landed cost, tax engines, or CNAB bank integrations is a plus.
• Collaborative Partner: Ability to communicate effectively with both technical peers and Finance stakeholders to translate business needs into architectural requirements.