Full Stack Engineer - Research Systems

eBay•Toronto, ON

About The Position

Join eBay’s Research Technology team and help shape the platforms, dashboards, and customer management systems that power insights and decision‑making for researchers, designers, and product partners across the company. We’re seeking a Full Stack Engineer (L24) to design and build end‑to‑end web applications, APIs, and integrations that support research dashboards, customer management workflows, and internal tooling. In this role, you’ll work across React, Node.js, and Java services, connecting to third‑party APIs and existing internal systems to deliver reliable, production‑ready capabilities. This is an individual contributor role where you’ll own features from design through deployment and monitoring.

Requirements

4–7 years of professional software engineering experience, including significant full‑stack work on production systems.
Strong proficiency with React (or a comparable modern front‑end framework) building modular, component‑based UIs backed by robust state management and testing.
Hands‑on experience building Node.js services (TypeScript or JavaScript), including Express‑style HTTP servers, middlewares, and integrations with downstream services.
Solid Java programming skills and experience working within existing Java services or microservices (e.g., Spring or similar frameworks).
Demonstrated experience designing and implementing RESTful APIs, including data modeling, authentication/authorization, and API documentation.
Experience integrating with third‑party APIs (REST/JSON or similar), including handling retries, backoff, error classification, and observability.
Comfortable working in and improving existing codebases—including reading unfamiliar code, debugging complex issues, and incrementally refactoring without breaking behavior.
Familiarity with building dashboards, internal tools, or customer management systems that expose configuration or customer data in safe, user‑friendly ways.
Proficiency with relational databases (e.g., MySQL, PostgreSQL) and basic query design; familiarity with at least one NoSQL or document store is a plus.
Strong foundation in software engineering fundamentals: testing, version control (Git), code reviews, and CI/CD workflows.

Nice To Haves

Experience designing or evolving internal platforms or tooling used by multiple teams (e.g., analytics dashboards, experimentation tools, content/experience management, or workflow systems).
Familiarity with modern front‑end tooling (Webpack/Vite, linting, type‑checking, testing frameworks) and performance optimization techniques.
Experience working with feature flags, configuration services, or experimentation frameworks.
Exposure to cloud‑native environments and containerized workloads (e.g., Docker, Kubernetes) and associated observability stacks (logs, metrics, tracing).
Comfortable navigating ambiguity, breaking down loosely defined problem spaces into clear milestones and shippable slices.
Strong communication skills with the ability to explain complex technical concepts to non‑technical partners and to write clear technical designs and documentation.

Responsibilities

Design, implement, and ship full‑stack features across React front‑ends, Node.js services, and Java back‑end components, with an emphasis on performance, reliability, and maintainability.
Design and evolve RESTful APIs and service contracts, including resource modeling, error handling, and versioning, in partnership with other engineering teams.
Integrate with third‑party APIs and internal platforms, handling auth flows, rate limits, and failure modes gracefully.
Build and maintain dashboards, internal tools, and lightweight customer management systems and configuration tools that give researchers and partner teams powerful, safe controls over customer records, cohorts, and workflows.
Work effectively within and around existing infrastructure, finding pragmatic solutions and designing extensions that respect current constraints while moving the system forward.
Read, understand, and refactor existing codebases, improving structure, test coverage, and observability as you go.
Take ownership of the full lifecycle of your work: technical design, implementation, automated testing, code review, deployment, monitoring, and incident follow‑up.
Collaborate closely with design, product, research, and other engineering partners to shape requirements, clarify trade‑offs, and deliver high‑quality user and developer experiences.
Contribute to internal standards and best practices for full‑stack development, API design, and tooling, helping the team move faster and more safely over time.