Senior Test Engineer (UI Team)

Index Exchange; Toronto; On-site; CAD 110,000 - 160,000; Full time

Benefits offered by this job

Health, dental, vision plans

Generous PTO and flexible schedules

Equity package

Retirement matching

Parental leave

Well-being allowance

Commuter benefits

Learning and development programs

Volunteer time off

Job summary

Index Exchange is hiring a Senior Test Engineer to join the UI engineering team, driving test automation and high‑quality software for a global ad tech platform. The role emphasizes validating complex distributed components, collaborating with product and UX, and maintaining a rigorous quality bar across fast‑moving releases.

You’ll work on full‑stack tests for GraphQL/REST APIs, contribute to the design system, and mentor others while advancing our testing tooling and automation capabilities.

Qualifications

• 5+ years of experience as a Software Engineer.
• 3+ years designing and implementing automated validation systems or test infrastructure.
• Experience validating high‑throughput, low‑latency distributed systems.
• Proficiency with JavaScript (Node, React), Golang, MySQL or equivalent.

Responsibilities

• Test the control plane for programmatic ad tech touching millions of users daily.
• Collaborate with platform engineers to develop and automate full validation spectrum.
• Lead data analysis to assess data health and root causes of issues.
• Identify gaps in testing and drive long‑term test suite improvements.
• Design and evolve test automation framework architectures and tools.
• Contribute to design processes to build a testable platform and data models.

Skills

Software testing

Automated validation

CI/CD DevOps

Distributed systems

JavaScript (Node/React)

Golang

SQL

Tools

GraphQL

REST APIs

Selenium

Jest

Job description

At Index Exchange, we’re reinventing how digital advertising works—at scale. We are a globally trusted independent supply-side platform, powering intelligent decisioning to maximize value for media owners and deliver stronger outcomes for buyers.

We’re a proud industry pioneer with over 20 years of experience accelerating the ad technology evolution. Our proprietary tech is trusted by some of the world’s largest brands and media owners and plays a crucial role in keeping the internet open, accessible, and largely free.

We process more than 550 billion real-time auctions every day (in comparison, Google processes about 14 billion searches per day) with ultra-low latency. Our platform is vertically integrated from servers to networks and runs on our own metal and cloud infrastructure. This end-to-end infrastructure is designed to provide both stability and agility, enabling us to adapt quickly as the market evolves.

At the core of it all is our engineering-first culture. Our engineers tackle internet-scale problems across tight-knit, global teams. From moving petabytes of data and optimizing with AI to making real-time infrastructure decisions, Indexers have the agency and influence to shape the future of advertising. We move fast, build thoughtfully, and stay grounded in our core values.

About The Role

We’re looking for a Senior Test Engineer to join the UI engineering team, who can leverage their depth and breadth of experience to help us continue to grow our platform while maintaining high standards for efficiency, quality, performance, integrity, and technical excellence.

The UI application product team works directly with product and UX stakeholders to bring their visions to life by implementing full screen workflows backed by GraphQL and REST APIs, as well as maintaining the design system library and UI components other screen builders rely on.

Index’s exchange operates at a global scale, handling millions of transactions every second of every day. Achieving our mission means holding the highest bar for Quality (functional, performance, reliability, resiliency, efficiency, yield) at all times; every millisecond quite literally counts in our business.

What We’re Looking For

• Leaders: You know how to work with a team of engineers, mentoring and guiding members of the team, as well as leveraging your own knowledge and experience to make sound decisions
• Problem Solvers: You are tenacious at finding solutions and find creative ways to solve problems while working with others amicably and presenting your viewpoints. You like figuring out where things break so others can collaborate to make them better.
• High Standards: You take the quality of every release personally. You have a passion for building comprehensive test suites for complex software, and bring a robust CI/CD DevOps tooling culture to bear to keep the signals flowing
• Knowledge Hungry: Learning new frameworks and languages is exciting to you – you’re not satisfied with the status quo. Our solution space exists on the cutting edge.

Here’s What You’ll Be Doing

• You’ll be working to test the control plane for cutting edge programmatic ad tech that touches millions of users every single day
• Operate side‑by‑side with platform and feature engineers, developing comprehensive tests for each build as a core component of the quality strategy and SDLC. You will interpret functional requirements and designs to: plan, develop, execute and automate the full spectrum of validation, operating a crucial gateway on the critical path to production.
• As a member of the development team, you will drive daily test result reviews, issue diagnosis, resolution and closure. Lead or assist in data analysis to determine data health and consistency, or root cause of issues.
• Identify and address gaps in testing over time, proactively as well as through responding to release blockers and production incidents. Take long‑term responsibility for an ever‑improving test suite.
• Be a key technical leader in driving the architecture evolution of our software/data test automation framework and related capabilities
• Lead the definition, design, dev, docs, and maintenance of tools, test cases, and automation frameworks
• Provide feedback and influence into the design process to help us build a testable platform, applications, and data models
• Design and build quality, performance, and reliability in from day one, and inspire other team members to do the same

Here’s What You Need

• You are a talented, fast learner and embrace change
• 5+ years of experience as a Software Engineer
• 3+ years designing and implementing automated validation systems, test infrastructure, or developer tooling as production‑quality software
• Experience designing and building simulation software to validate functionality and performance of end‑to‑end software solutions
• Experience validating high‑throughput, low‑latency distributed systems where correctness, resiliency, and performance characteristics matter at scale
• A passion for designing, writing, and testing high‑quality code. We use a lot of different languages and frameworks including JavaScript (Node, React), Golang, MySQL and more
• Experience in performance test design, load modeling, profiling and identifying systemic bottlenecks in distributed systems.
• Excellent problem‑solving skills, the ability to think differently, and an understanding that compromise, negotiation and practicality are important qualities
• A desire to work with and learn from the people around you – we greatly value people and interactions
• We’re looking for the right combination of personality and ingenuity to push our product to the max, inspire those around you and have fun doing it.

Why You’ll Love Working Here

• Comprehensive health, dental, and vision plans for you and your dependents
• Paid time off, health days, and personal obligation days plus flexible work schedules
• Competitive retirement matching plans
• Equity packages
• Generous parental leave available to birthing, non‑birthing, and adoptive parents
• Annual well‑being allowance plus fitness discounts and group wellness activities
• Commuter benefits and discounts, where available
• Employee assistance program
• Mental health first aid program that provides an in‑the‑moment point of contact and reassurance
• One day of volunteer time off per year and a donation‑matching program
• Bi‑weekly town halls and regular community‑led team events
• Multiple resources and programming to support continuous learning
• A workplace that supports a diverse, equitable, and inclusive environment – learn more here

Equal employment opportunity

At Index Exchange, we believe that successful products are built by teams just as diverse as the audience who uses them. As such, we are committed to equal employment opportunities. We celebrate diversity of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or expression, or veteran status. Additionally, we realize that diversity is deeper than any status or classification—diversity is the human experience. For those who show grit, passion, and humility—Index will welcome you.

Accessibility For Applicants With Disabilities

Index Exchange welcomes and encourages individuals with disabilities to apply to work with us.

If you require an accommodation, please share the details of your request and any information how we can assist you with the hiring recruiter when they contact you. Index Exchange will make reasonable efforts to ensure accommodation requests are met throughout the recruitment process.

Index everywhere, Index anywhere

Our corporate headquarters are in Toronto, with major offices in New York, Montreal, Kitchener, London, San Francisco, and many other global cities. As a major global advertising exchange, we are committed to operating as a tightly knit global team and embracing and empowering talent wherever our colleagues may be.

AI Disclaimer

Automated tools including artificial intelligence may be used to assist in screening and assessing applicants for this role. All hiring decisions involve human review.

Vacancy Status: This posting is for an existing vacancy.