--- title: 'Senior Fullstack Engineer (Moderation) at Stream' canonical: 'https://feeny.ai/job/senior-fullstack-engineer-moderation-stream-toronto-7ndya5fv62bh' type: 'job' last_seen: '2026-10-28' --- # Senior Fullstack Engineer (Moderation) at Stream - **Company:** Stream - **Location:** Toronto, Canada - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-10-27 - **Last confirmed live:** 2026-10-28 - **Apply:** https://jobs.ashbyhq.com/stream/950ba8ae-b3c5-4a24-ab0d-756c9012a731 ## Job description ## About Stream Stream powers real-time [Chat](https://getstream.io/chat/), [Video](https://getstream.io/video/), [Activity Feeds](https://getstream.io/activity-feeds/), and [AI Moderation](https://getstream.io/moderation/) for more than 1 billion end users across 4,000+ apps, from Strava and Bumble to eBay and Patreon. Our platform processes billions of API requests per month and supports applications with millions of concurrent users, while delivering highly reliable, low-latency services and a great developer experience. ## The role We're looking for a Senior Full Stack Engineer I to join Stream on our mission of elevating the quality of apps for billions of users globally. You'll own the backend of our AI Moderation product: building new capabilities and making the Go services behind them cleaner, faster and more reliable. This is a full-time role, hybrid with 3 days a week in our Toronto co-working space. ## What you'll work on You'll join our five-person Moderation team, which builds the product customers use to detect, review and act on harmful content in their apps. The role leans backend. Dedicated frontend engineers own the moderation dashboards, and you'll own the Go services, data model and integrations behind them, stepping into React when a feature spans the stack. You'll work closely with the team lead, our other Toronto-based engineer, Infrastructure, and the Customer Success and Support teams, and directly with customers' trust and safety and engineering teams. Here's the honest current state: the product has grown fast and the backend has grown with it. There's real cleanup, refactoring and simplification to do, and you'll have the room to do it well. You'll also give the team coverage in North American hours, which today rests largely on one engineer. Job responsibilities: - Build new moderation features: design and ship Go services from database schema and API endpoints through to production rollout, including work on our new AI moderation flow. - Clean up the backend: refactor existing moderation services, reduce technical debt, simplify code paths and raise test coverage. - Improve reliability and performance: strengthen alerting and observability, and fix scaling and latency issues in the moderation pipeline. - Own third-party integrations: maintain and extend the AI and moderation providers that plug into the pipeline. - Keep production healthy: diagnose defects to root cause and take part in on-call, with a focus on North American hours. - Work with customers: troubleshoot their issues directly and bring what you learn back into the roadmap. - Work across the stack when needed: ship React changes alongside the frontend engineers and review your peers' code. ## About you You're a backend engineer at heart who is comfortable picking up frontend work when a feature needs it. You enjoy leaving a codebase better than you found it, and you'd rather simplify a service than add another layer to it. You like owning problems end to end, including the ones that show up in production or in a customer conversation. You probably won't enjoy this role if you want a pure frontend position, a large team with a fixed process, or a job with no on-call. The team is small, the product is moving fast, and North American coverage is part of the job. You have: - 6+ years of professional software engineering experience, mostly on the backend. - Solid backend experience in Go, Python or a comparable language, and willingness to work in Go. We run a 10-week internal Go onboarding programme. - Experience designing REST APIs and relational data models (ideally Postgres), and working with Redis. - A track record of shipping features used at scale and of refactoring and improving existing production systems. - Working knowledge of React and TypeScript or JavaScript. - Experience with automated testing across client and server code. - Comfort working with customers and handling production incidents. Bonus points: - Exposure to trust and safety, content moderation or policy enforcement products. - Professional experience with Go. - Experience with GCP or another major cloud provider. - Experience integrating LLM or ML-based services into production systems. - Message queue experience. - Full-text search experience. - Open-source contributions. What makes this role exciting - Scope: you'll own the backend of a product area, with the room to clean up and reshape it. - Impact: AI Moderation is one of Stream's growth products, and you'll help ship its new AI moderation flow and the features that come after it. - Stack: Go, Postgres, Redis and React on GCP, with Claude, Cursor and ChatGPT Codex as everyday tools. - Starting point: a small team where your work is visible from week one, and a second Toronto engineer to work with closely. Why join Stream? We're a Series B company with offices in Boulder, Amsterdam, Skopje and Toronto, and a team of 140+ people from 37 nationalities. We're backed by Felicis Ventures, GGV Capital, 01 Advisors, Techstars, and Arthur Ventures, with angels including Dick Costolo (ex-CEO of Twitter), Olivier Pomel (CEO of Datadog), Tom Preston-Werner (co-founder of GitHub), and Nicolas Dessaigne (co-founder of Algolia). We'll be straight with you: a startup is more demanding than a large company. There's no fixed playbook, you'll own things end to end, and you'll sometimes pick up work outside your title. That's also what makes it a fast place to grow. If you want real ownership and high scale more than structure and a set career ladder, you'll feel at home here. ## What we offer - A base salary of CAD 130,000 to 190,000 per year - Stream employees enjoy some of the best job benefits in the industry: - A team of exceptional engineers - The chance to work on OSS projects - 20 days of PTO first year of employment, 24 days starting your second year - Company equity - Extended Healthcare - Dental benefit - Long & Short-Term Disability - Life Insurance - Fitness stipend - A Macbook Pro provided - A Learning and Development budget - The opportunity to attend or present to global conferences and meetups - The possibility to visit our offices in Boulder, CO and Amsterdam, NL Our culture Stream is a casual, transparent team that aims high and supports each other. In engineering, we care about ownership and quality, and our goal is to ship stable software. Management stays hands-on, with less middle management and more time spent doing the work. If that sounds like the environment you want next, apply now. ## Equal opportunity Stream is an equal opportunity employer and welcomes applications from all qualified candidates. We don't discriminate based on any ground protected by the Ontario Human Rights Code. Accommodation is available on request for candidates taking part in all parts of the selection process. This posting is for an existing vacancy. We don't use AI to screen, assess or select applicants. You must be legally entitled to work in Canada; we can't offer visa sponsorship or relocation for this role. Hybrid office policy: applicants based (or relocating to) one of our office locations are expected to work according to the applicable local office attendance policy. Equal opportunity employer statement: Stream provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. Note for external recruiters: We currently have this role covered and do not accept unsolicited agency resumes. We are not responsible for any fees related to unsolicited resumes. ## About Stream ## Company Overview - **One-liner**: Stream provides a unified platform of APIs and SDKs for building scalable, real-time chat, video/audio, activity feeds, and AI-powered moderation features. - **Entity Type**: Private (Series B) - **Headquarters**: Boulder, Colorado, United States (with offices in Amsterdam, Netherlands; Skopje, North Macedonia; and Toronto, Canada) - **Founded**: 2015 - **Founders**: Thierry Schellenbach and Tommaso Barbugli ## Core Business - **Primary industry**: Technology, Information and Internet — specifically real-time communication infrastructure and developer tools. - **Target customers**: B2B — product and engineering teams at apps, social networks, marketplaces, gaming platforms, and any digital service needing in-app chat, video, or activity feeds. - **Mission or purpose**: To help apps build real-time experiences that scale, by handling the hard parts of real-time AI and infrastructure so developers can ship their actual product faster. ## Products & Services - **Chat Messaging API**: A scalable, low-latency chat API with support for offline, global messaging, and customizable UI kits. Type: SaaS API. - **Video & Audio API**: Real-time voice and video calling infrastructure. Type: SaaS API. - **Activity Feeds API**: A personalized feed engine for building social timelines and notification streams. Type: SaaS API. - **AI Moderation**: LLM-powered, real-time content moderation for text, image, video, and audio. Includes automated queues, reviewer workflows, and compliance support for DSA, Online Safety Acts, and COPPA. Type: SaaS API. - **Vision AI Agents (open-source)**: An open-source SDK for building multi-modal AI agents that can see, hear, and act — with features like RAG, tool use, phone calling, pose tracking, and object detection. Type: Open-source SDK. ## Market Standing - **Valuation/Market Cap**: Not publicly disclosed. - **Key Metric**: Total funding of **$58.25 million** (Series B). Annual revenue estimated at **$4.9 million**. - **Notable Investors/Partners**: Notable Capital (lead investor in Series A), Arthur Ventures (lead investor in Seed), Social Starts, and other investors. - **Growth Signals**: The company serves **2,000+ global apps** and powers experiences for **1+ billion end users**. Headcount is **131 employees**, growing **15.2% year-over-year** (+44 people). Operates in **26 countries** with 6 edge-server locations and a **99.999% uptime SLA**. They have recently launched an open-source Vision AI SDK and are expanding into AI agent infrastructure. ## Competitive Advantages - **Unified platform**: Combines chat, video, feeds, and moderation on a single shared infrastructure, eliminating the need to "duct-tape" multiple point solutions together. - **Performance**: Sub-9ms API response times and a battle-tested global edge network built for millions of concurrent users. - **Developer experience**: 10+ SDKs with typed APIs, clear docs, and customizable components. Ships in under 50 lines of code for many use cases. Open-source SDKs and zero lock-in. - **Enterprise readiness**: SOC 2 compliant on day one, with full audit logs, transparent reasoning, and compliance support for major regulations (DSA, COPPA, Online Safety Acts). - **AI-native**: Built-in LLM-powered moderation with fewer false positives, and a new open-source platform for multi-modal AI agents. ## Strategic Focus - **AI Agents**: A major push into real-time AI with the launch of the open-source Vision AI SDK, enabling voice, vision, and tool-use agents. Focus on edge-agnostic routing, low-latency pipelines, and modular plugins. - **Moderation & Compliance**: Deepening AI moderation capabilities to meet growing regulatory demands (DSA, Online Safety Acts). - **Global scale**: Continuing to expand edge infrastructure and support for a global customer base across 26+ countries. - **Developer community**: Maintaining and growing the open-source SDK ecosystem to drive adoption and reduce lock-in concerns. ## Why Work Here - **Culture**: Stream emphasizes mastery, transparency, and teamwork. The team is distributed across 35 nationalities with offices in Boulder, Amsterdam, Skopje, and Toronto. - **Remote/Hybrid/Office**: Offers a mix of in-office, remote (EU), and hybrid roles. Offices are located in Boulder (USA), Amsterdam (NL), Skopje (MK), and Toronto (CA). - **Notable perks**: - **Stock options** granted to all full-time employees. - **Comprehensive healthcare**, dental, and vision plans (US only) plus generous parental leave. - **401K** (US) and local pension scheme contributions (Amsterdam). - **Monthly fitness stipend**. - **Commuter benefits** (free office parking and transportation). - **Interesting technical challenges**: Working on real-time infrastructure at massive scale (1B+ end users, sub-9ms latency, 99.999% uptime). - **Engineering culture**: Heavy investment in open-source, SDK quality, and developer experience. The company is 50+ engineers strong and values shipping fast. ## Sources 1. [getstream.io](https://getstream.io/) 2. [LinkedIn](https://www.linkedin.com/company/getstream) 3. [Crunchbase](https://www.crunchbase.com/organization/getstream-io) 4. [getstream.io/team](https://getstream.io/team/) 5. [jobs.ashbyhq.com/stream](https://jobs.ashbyhq.com/stream) ## Other roles at Stream - [Backend Engineer – Real-Time Video](https://feeny.ai/job/backend-engineer-real-time-video-stream-amsterdam-n96pax6ez78z) — Amsterdam, Netherlands - [Staff Software Engineer, Backend](https://feeny.ai/job/staff-software-engineer-backend-stream-amsterdam-m8bnbt80kz9j) — Amsterdam, Netherlands - [Marketing Operations Analyst, Revenue Operations](https://feeny.ai/job/marketing-operations-analyst-revenue-operations-stream-boulder-2vphyvwex3ht) — Boulder, CO - [Manager, Sales Development & Enablement](https://feeny.ai/job/manager-sales-development-enablement-stream-boulder-t856vf9sfwqp) — Boulder, CO - [Staff Software Engineer, Infrastructure](https://feeny.ai/job/staff-software-engineer-infrastructure-stream-amsterdam-3b4tvqzq0q42) — Amsterdam, Netherlands - [Lead Data Engineer](https://feeny.ai/job/lead-data-engineer-stream-boulder-dzdsha08vx43) — Boulder, CO - [Solutions Consultant II- Trust & Safety](https://feeny.ai/job/solutions-consultant-ii-trust-safety-stream-united-states-gnsw1bc5p3ky) — United States