Zynap
Senior Full-Stack Engineer
Senior Full-Stack Engineer at Zynap builds and owns features end to end on an AI-native platform: Go and Python microservices, event-driven pipelines, and a React + TypeScript front end. Agents and LLM-powered workflows are core to the product, and AI coding tools are core to the workflow. On-site in Barcelona.
- Compensation
- Not disclosed
- Location
- Barcelona, Spain
- Work setup
- Not specified
- Seniority
- Senior
- Employment
- Not specified
- Experience
- 4+ years
- Category
- Fullstack
- Posted
Skills
Must have
- 4+ years building and shipping production software with senior-level ownership from design through operation
- Strong hands-on React (with TypeScript) experience in production applications
- Strong backend experience in Go or Python (at least one required)
- AI-driven development experience: genuine fluency with AI coding agents (e.g. Claude Code, Cursor, Codex) in your real workflow
- Familiarity with AI-driven development practices: working with LLMs, prompting, critically evaluating AI-generated code
- Solid engineering fundamentals: API design, data modelling, testing, debugging distributed systems
- Professional English, written and spoken
Nice to have
- Experience in both Go and Python
- Familiarity with event-driven architectures: queues, workers, async pipelines (SQS, Kafka)
- Experience with AWS ecosystem (also Terraform, Docker, Kubernetes)
- Experience building AI-powered product features (tool use, MCP, RAG, evals)
- Background or interest in cybersecurity
- Spanish or additional languages
Full description
About the role
- We are looking for a Senior Full-Stack Engineer to build across the whole platform: from the Go and Python services and event-driven pipelines that power it, to the React application our customers use every day. AI is not a side project here: agents and LLM-powered workflows are core to the product, and AI-driven development is core to how we build it. You will ship features end to end, own them in production, and help raise the bar for how a modern, AI-native engineering team works.
What you'll do
- Build and ship product features end to end: backend services, APIs, and the React front end
- Work across our Go and Python microservices
- Build and evolve our React + TypeScript web application
- Work with event-driven pipelines (queues, workers, schedulers) building scalable solutions
- Build AI-powered product capabilities: agents, LLM integrations, and tooling
- Make AI-driven development a first-class part of how you work, using coding agents and AI tooling daily, and helping shape how the team uses them well
- Own quality end to end: testing, code review, observability, and deployment
- Collaborate closely with Product and Design
What we're looking for
Must have
- 4+ years building and shipping production software, with senior-level ownership of features from design
- through operation
- Strong hands-on experience with React (with TypeScript) in production applications
- Strong backend experience in Go or Python (at least one is required; we work in both)
- AI-driven development experience: genuine fluency with AI coding agents and assistants (e.g. Claude
- Code, Cursor, Codex, etc.) as part of your real development workflow, and sound judgement about when and how to use them
- Familiarity with AI-driven development practices more broadly: working with LLMs, prompting, and evaluating AI-generated code and output critically
- Solid engineering fundamentals: API design, data modelling, testing, and debugging distributed systems
- Professional English, written and spoken
Nice to have
- Experience in both Go and Python
- Familiarity with event-driven architectures: queues, workers, and asynchronous pipelines (SQS and Kafka)
- Experience with AWS and its ecosystem (we also use Terraform, Docker, and Kubernetes)
- Experience building AI-powered product features (tool use, MCP, RAG, evals)
- Background or interest in cybersecurity
- Spanish or additional languages
How you work
- Pragmatic and product-minded: you optimise for shipping value to users, not for elegance in the abstract