Senior Full Stack Engineer in Toronto

The opportunity at Unity involves building a world-class advertising platform that operates at a massive global scale. The Ads team powers the systems that connect advertisers with creators and players, driving performance, reliability, and growth across our ecosystem.

As a Senior Full-Stack Engineer on the Unified Ads Platform team, you’ll own the service layer where advertiser and publisher entities live. This includes campaigns and budget caps, applications and ad units, creative packs and the moderation pipeline behind them, offerwall currency, A/B tests, and LevelPlay integration. You will design contracts that stay stable as the product changes, keep state consistent across service boundaries, and own the correctness and availability of all of it in production.

This role is ideal for someone strong on both sides of the stack who thinks in terms of data contracts and correctness, and who wants real ownership of systems other engineering teams depend on. As the team grows, this role has a path to evolve into a Tech Lead Manager position.

What you’ll be doing:

• Design, build, and operate services in our TypeScript platform (NestJS) across a large domain model, owning the APIs and data contracts that downstream ads systems depend on.
• Model entity data for scale and change — relational schema design, migrations, and schema evolution against tables that serving, billing, and reporting all read from.
• Design and build event-driven integrations with Kafka and Google Cloud Pub/Sub, using patterns such as transactional outbox and idempotent consumers to maintain consistency across service boundaries.
• Deliver the user-facing surfaces on top of the platform in React and TypeScript, turning dense entity and performance data into workflows publishers and advertisers can trust.
• Operate what you build on Kubernetes, where the service declares its own cloud infrastructure alongside its code, and take real ownership of its SLOs.
• Drive observability and quality across the platform — distributed tracing, metrics, and testing frameworks.
• Set the standards for how the service is built and hold the line on them in design and code review, mentoring engineers as you go.

What we’re looking for:

• 6+ years building and operating production software, with real depth on both backend services and modern frontend.
• Advanced TypeScript, and experience with an opinionated, modular Node backend framework — NestJS, or comparable dependency‑injection and module architectures.
• Strong data modelling and SQL— schema design, migrations, and performance at scale, alongside the API versioning judgment that goes with it.
• Event‑driven systems— Kafka, Pub/Sub, or similar.
• Advanced React, with strong judgment around component design, state management, and performance in data‑intensive interfaces.
• Cloud‑native operation— containerized services on Kubernetes, and comfort owning the system in production, including deployment, scaling, monitoring, incident response, and on‑call.
• Strong ownership mindset— focused on correctness, observability, and long‑term maintainability, backed by real engineering discipline in testing, review, and accessibility.

You might also have:

• Background in ads, attribution, billing, or monetization systems.
• Infrastructure‑as‑code experience — Kubernetes‑native resource management, Terraform, or service mesh.
• Familiarity with OpenTelemetry and distributed tracing in production.
• Experience with design systems or configuration‑driven UI frameworks.
• Exposure to cross‑team technical alignment or guild‑style quality initiatives.

Additional Information:

Zone A: $135,400 - $175,900
Zone B: $125,300 - $162,800
This range reflects the anticipated base salary for this position. Beyond base salary, this role may be eligible for equity awards and participation in our company incentive plans (such as annual discretionary bonuses or sales commissions). The final offer amount will depend on several factors, including geographic location and the candidate’s relevant experience, professional background, and skill set.

Benefits:

At Unity, we want our team members to thrive. We offer a wide range of benefits designed to support well‑being and work‑life balance. Please note: Benefits eligibility, specific offerings, and coverage vary based on the country and employment status. While specific benefits vary, here are some of the ways we strive to take care of our eligible team members globally:

• Comprehensive health, life, and disability insurance
• Commute subsidy
• Employee stock ownership
• Competitive retirement/pension plans
• Generous vacation and personal days
• Support for new parents through leave and family‑care programs
• Office food snacks
• Mental Health and Wellbeing programs and support
• Employee Resource Groups
• Global Employee Assistance Program
• Training and development programs
• Volunteering and donation matching program

Life at Unity:

Unity [NYSE: U] is the world’s leading game engine, powering play for more than 3 billion consumers each month. The top mobile games in the world, the most played PC indie titles, the most innovative console games, and virtually all of the top XR and Web Games are developed, deployed, and grown in Unity. Unity also enables teams across industries like automotive, manufacturing, and healthcare to design, simulate, and collaborate in 3D — closing the gap between ideas and reality.

Unity is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation or any other protected status in accordance with applicable law.