Senior Backend & Platform Engineer
Role details
Job location
Tech stack
Job description
The Platform team treats reliability and developer experience as a product, not as a constraint.
We want engineers who ship through complexity instead of around it, and who already use AI every day rather than watching it from a distance.
If you enjoy backend and infrastructure work, are comfortable jumping into frontend when needed (AI helps), and believe AI is a genuine productivity multiplier when used thoughtfully, we'd love to talk.
About the Role and the Team
The Platform team at PhantomBuster is the technical backbone of our SaaS product. We ensure reliability, scalability, developer experience, and performance across our backend and infrastructure.
You'll join the CSI squad, one of our Platform squads, alongside a tight group of experienced engineers. You'll report to Clément, our Engineering Manager, and work daily with our Tech Lead, Olivier, who acts as the technical reference for the team. You'll also collaborate frequently with the Product squads (Griffin, Unicorn) and the DataIO/PI squads.
We're looking for someone with strong backend and infrastructure fundamentals, comfortable enough with frontend (React) to ship end-to-end features when needed (with AI as a force multiplier), and motivated by the AI transformation happening across our engineering team.
Concrete topics you'll work on:
- Scalability and sharding: our backend architecture is under pressure as we grow. You'll help design and implement the sharding strategy that unlocks the next order of magnitude.
- MCP compatibility with our API: keeping our public API surface aligned with the MCP protocol as both evolve, so AI agents can interact with PhantomBuster reliably.
- Harness engineering: building the infrastructure that lets agentic AI workflows run safely against our codebase.
- Reliability and observability: improving how we detect, measure, and respond to issues in production.
About the technical stack:
- TypeScript with strict rules
- Node.js, PostgreSQL, Redis
- Cloud-based architecture on AWS
- DevOps tools such as Docker, Ansible and Pulumi.
- CI/CD with GitHub Actions and CircleCI
- React for the frontend side of the stack
- AI tooling: Claude Code, Cursor, Codex, internal AGENTS.md/CLAUDE.md conventions, custom agents Skills and autonomous agents
What You'll Do
AI-assisted engineering
- Use AI tools daily as part of your engineering workflow (code generation, reviews, debugging, exploration)
- Question AI outputs critically. Accuracy and judgment matter more than raw speed
- Contribute to our agentic engineering initiatives: agent reviews, AGENTS.md conventions, internal autonomous agent (Ghost), harness work
- Ship full-stack features end-to-end when needed, leveraging AI on the frontend side
Backend & Infrastructure
- Own end-to-end delivery of Platform projects
- Tackle scalability and sharding work as our load grows
- Maintain and evolve our API and its MCP compatibility layer
- Improve reliability, observability, and performance of our systems
- Contribute to our infrastructure: AWS, Docker, Infrastructure as Code (Ansible, Pulumi), CI/CD pipelines
Quality & Developer Experience
- Prevent bugs and technical debt from reaching production through rigorous code reviews
- Improve internal tooling, deployment workflows, and the day-to-day developer experience
- Write tests that match our team's strategy and raise the quality bar where you see gaps
- Drive monitoring and observability improvements in our domain
Collaboration & Support
- Participate in our weekly Support Duty rotation (handling internal requests and Zendesk
tickets escalated to Platform)
- Contribute to our deployment rotation
- Pair with engineers from other squads when backend changes affect their work
Documentation & Knowledge sharing
- Write specifications and decision records for the projects you lead
- Share what you learn through internal demos, written posts, or thorough code reviews
- Start mentoring more junior engineers as you grow into the role
Requirements
Do you have experience in Zendesk?, * 7+ years of experience in backend or infrastructure engineering, ideally in SaaS
- Proven track record of shipping and operating real production systems
Technical skills
- Strong in TypeScript / Node.js (Koa)
- Comfortable with PostgreSQL, Redis, RabbitMQ/AMQP and distributed multi-service deploys (backward-compat awareness)
- Solid AWS experience (or equivalent cloud), Docker, IaC and CI/CD pipelines
- Familiar with observability practices (logging, metrics, tracing) and able to use them to drive improvements
- Comfortable enough with React to ship features end-to-end with AI assistance. Full-stack curiosity rather than full-stack expertise
- Bonus: exposure to LLM / agentic AI (AWS Bedrock AgentCore, LangChain/LangGraph) or browser automation / scraping at scale
Green flags
- You've shipped infrastructure that you still operate today
- You bring up AI in conversation before being asked, and you have informed opinions on which tools work and which don't
- You've already dealt with scalability work (sharding, partitioning, queue tuning, hot paths) and have scars to show for it
- You're comfortable opening a Linear issue, a PR, and a Notion doc in the same morning
- You see reliability and developer experience as a product, not as a constraint
- You value pragmatism over perfection, and shipping over polish
Benefits & conditions
- Think infra is something other people should handle
- Arrive with proposals to rewrite the whole stack before understanding why it exists
- Are skeptical that AI has a real place in critical backend or infra work
- Find Support Duty or operational work beneath you
- Need a backlog handed to you to be productive