Senior Full Stack Software Engineer

We’re hiring a Senior Full-Stack Engineer to build and scale the platform behind a high-performance fulfilment system. This includes the core WMS/OMS powering our operations and evolving into a standalone product.

This is a senior, high-ownership role. You will lead the design and delivery of critical systems end-to-end — from architecture and data models to user-facing applications — and set the technical standard for how we build.

You'll work across a TypeScript-first stack of backend services, web applications, and mobile platforms, solving real-world warehousing problems at scale.

What You'll Do

• Lead large technical initiatives end-to-end from discovery and design through implementation, rollout, and post-launch iteration. You'll be the technical owner other engineers look to for direction on these workstreams.
• Design scalable, maintainable system architectures, making clear trade-offs across performance, complexity, and speed.
• Build across the stack: backend services, APIs, and user-facing applications.
• Drive the mobile platform: help shape the architecture of our upcoming React Native apps.
• Work on meaningful domain problems: order lifecycle and returns, marketplace integrations, courier and shipping logic, product and inventory management, warehouse workflows, and the interfaces between a digital platform and a physical, robotic fulfilment center.
• Raise the engineering bar: thoughtful code reviews, pragmatic testing, clear documentation, and mentorship for the engineers around you.
• Collaborate cross-functionally with product, operations, and warehouse teams to turn messy real-world fulfilment problems into clean, maintainable software.
• Lead and drive AI adoption within engineering workflows, identifying opportunities to improve team productivity, code quality, and delivery speed through modern AI tools and practices.

Must-Have Qualifications

• 4–6+ years of experience building and shipping production grade software systems.
• Solid understanding of system design and architecture, ability to design scalable, maintainable systems (microservices, modular monoliths, event-driven patterns, etc.).
• Strong engineering fundamentals: debugging, performance, reliability, scalability and clean abstractions.
• Strong back-end experience with Node.js or any Node framework (NestJS preferred).
• Strong front-end experience with React/Next including component architecture, state management, data flows, and performance optimization.
• Strong proficiency in TypeScript, including advanced type system features and their application in production systems.
• Strong Experience in designing and working with REST APIs, and gRPC / protobuf or another typed RPC contract.
• Strong experience with MongoDB or similar databases — including data modeling, indexing strategies, query optimization, and managing data consistency and performance at scale.
• Experience designing and operating systems on cloud infrastructure (preferably AWS), including compute, storage, networking, and managed services
• Proven ability to take ambiguous problems, define clear plans, and drive them to completion.
• Ability to work effectively in a remote, distributed, cross-functional team — strong written communication and async collaboration skills.
• Bachelor's degree in Computer Science, Software Engineering, or a related field (equivalent professional experience will also be considered).

Strongly Preferred

• Experience building and shipping production mobile applications (React Native preferred), including performance optimization, offline-first patterns, native integrations, and end-to-end release ownership.
• Experience with event-driven or message-based architectures.
• Experience with logistics, e-commerce, marketplaces, WMS, or fulfilment domains — or adjacent supply-chain systems.
• Strong experience in containerization and deployment tooling
• Experience working in an Nx monorepo or similar polyrepo/monorepo tooling
• Observability practices: structured logging, metrics, tracing, alerting.
• Exposure to warehouse automation, robotics integrations, or industrial IoT systems.

About OTO Fulfilment

OTO Fulfilment offers faster, more cost-effective, and scalable order fulfilment for small and medium-sized enterprises through a digital platform paired with a hyper-automated fulfilment center.

Our technology team is building a deeply integrated platform that serves as the foundation of our fulfilment systems — a modern WMS/OMS designed to handle the complexity of real-world operations.

This platform powers everything from order lifecycle and inventory management to warehouse workflows and system integrations, bringing structure and reliability to inherently complex, high-volume environments.