Senior Platform Engineer: AI-Powered Scalable Infra & CI/CD

Cello; United Kingdom; On-site; Full time

Job description

What We’re Building

• AI‑powered infrastructure company with $10.3M in funding from top‑tier investors.
• Exciting product: APIs, attribution models, MCP integration, AI‑based recommendation engines, and assistants – not your typical CRUD app.
• Real traction: 30+ new customers every month, 10M+ end users monthly.
• Small team, so you’ll genuinely shape how we build things.
• You’ll touch everything from frontend widgets to backend infrastructure to data pipelines. The work doesn’t get repetitive.
• We actively learn about new tech and AI tools and adopt where we can – we have to, because our customers do.
• Remote‑first, but we get together regularly—company‑wide and as an engineering team.
• The founding team consists of serial founders and experienced big‑tech operators from Twilio, Wise, and Skype.

Why Join

We help SaaS companies turn their users and partners into a sales channel through referrals, sharing, and recommendations. 10M+ end users interact with our system every month.

Our widgets live inside customer products, so your code runs in environments you don’t control. On top of that, we provide APIs that customer developers integrate against, and a portal where customers manage their campaigns and analytics.

Under the hood we deliver attribution across complex user journeys, AI‑based recommendation engines, and multi‑tenant infrastructure serving hundreds of customers at scale.

Our product is integrated by customer developers – and that world is changing fast. The people building against our APIs and widgets range from corporate engineering teams to solo founders using AI coding agents. Staying current with how developers work today and ensuring our product fits those workflows is an exciting challenge.

Your Mission

• Setup and maintain AWS infrastructure – architecture, reliability, security, and cost. You work directly with stakeholders with no intermediate teams.
• Design and maintain CI/CD pipelines that enable ship from commit to production with zero manual steps.
• Help decide when to ship fast to learn and when to solidify the foundation.
• Influence architecture and product direction beyond coding tickets.
• Adopt the latest AI improvements to accelerate building and shipping.

About You

• Good communication skills and a collaborative attitude.
• Experience building systems at real scale: high traffic, large user base, high availability.
• Deep AWS expertise across compute, messaging, storage, networking, and observability.
• Strong experience with Infrastructure as Code (Terraform or similar).
• Solid distributed systems thinking: ordering guarantees, idempotency, retries, at‑least‑once delivery, partial failure recovery.
• Experience running PostgreSQL in production – configuration, connection pooling, migrations, performance, backup and restore.
• Application‑layer literacy to read TypeScript/Node.js (NestJS) code.
• Good judgement of when "good enough" is sufficient and when to invest in quality.
• Strong problem‑solving ability; break down complex, ambiguous problems and ship pragmatic solutions.
• Contribute ideas and challenge assumptions, not just execute.
• Genuinely curious about the product itself.
• Knowledge of agentic coding tools such as Claude Code, Cursor, multi‑agent setups, etc., and using them to push limits.
• Strong work ethic – ownership, shipping commitments, self‑motivated.

Nice‑to‑Haves

• Strong opinions about observability – structured logging, distributed tracing (OpenTelemetry), dashboards and alerting built for on‑call humans, not vanity metrics.
• Experience operating event‑driven architectures under load (SQS, Kafka, or similar).
• Familiarity with data warehousing / analytics (ClickHouse, Snowflake, or similar).

About us

We are the revenue‑growth infrastructure for digital businesses to acquire, retain, and monetize customers at scale in the AI era. Cello turns word‑of‑mouth into a systematic growth channel. Our referral platform allows users and affiliates to share and discover any software product with only a few clicks, inspiring users to share the products they love and virtually reinventing how companies sell and market products. Category leaders including Typeform, Miro and Veed trust Cello to accelerate their growth flywheel.