Summary
✨ AI‑Generated
A growing technology team is looking for a Senior Full-Stack Engineer to build and scale a modern data-driven SaaS platform. You will work across database design, backend services, rich React interfaces, asynchronous workflows, analytics, AI integrations, cloud storage, testing, and production infrastructure. The role is ideal for an engineer with 5+ years of experience who enjoys owning production features end-to-end and solving challenging data and performance problems.
Highlights
Own end-to-end development across backend, frontend, data, analytics, AI integrations, and infrastructure. The role provides hands-on exposure to modern TypeScript and React applications, scalable Node.js services, large datasets, AI integrations, automated testing, CI/CD, and performance engineering.
Description
5+ years experience · TypeScript · React · Node.js
We’re looking for a Senior Full-Stack Engineer to join our team and help build and scale a modern data-driven SaaS platform.
You’ll work across the entire product.
from database design and backend services to React interfaces, background jobs, analytics, AI integrations, and production infrastructure.
What you’ll do
Build and ship production features end-to-endDevelop scalable REST APIs with Node.js and ExpressDesign and optimise MongoDB schemas, indexes, and aggregation pipelinesBuild asynchronous workflows using BullMQ and RedisDevelop fast, data-heavy React applications with TypeScriptBuild dashboards, tables, charts, filtering and analytics experiencesIntegrate LLM APIs and third-party servicesWork with Parquet, DuckDB and large datasetsImplement file exports, cloud storage and signed downloadsWrite automated tests and maintain CI/CD qualityTroubleshoot production issues and improve application performanceContribute to architecture and technical decisions
Tech Stack
Frontend: React 18, Vite, TypeScript, Tailwind CSS, React Router, Recharts, DuckDB-WASM
Backend: Node.js 22, Express, Mongoose, BullMQ, Redis, JWT
Database & Data: MongoDB, Redis, Parquet, S3-compatible storage, analytics pipelines
AI & Integrations: LLM APIs, MCP, OAuth 2.0, web scraping and third-party APIs
Infrastructure: Docker, Terraform, cloud VMs, managed PaaS, CDN and edge workers
Testing: Vitest, Supertest, Playwright, Testing Library, OpenAPI contract testing
Requirements
5+ years of professional software development experienceStrong hands-on experience with TypeScript, React and Node.jsStrong understanding of REST APIs, authentication and authorisationProduction experience with MongoDB or another NoSQL databaseExperience with Redis and queue-based systemsExperience building and debugging asynchronous/background processingStrong understanding of React performance and data-heavy UIsGood knowledge of Git, testing and modern development practicesAbility to take ownership of features from idea to productionStrong problem-solving and communication skills
Nice to Have
Experience with:
LLM/AI integrationsAnalytics or BI productsParquet, DuckDB or ClickHouseMulti-tenant SaaSTerraform and cloud infrastructureSSO/SAML/OIDC/SCIMWeb scraping and data acquisitionStorybook and design systemsPlaywright/E2E testingMCP and AI-agent integrationsSEO, GEO/AEO or marketing analytics
Who We’re Looking For
We’re looking for someone who enjoys building real products, solving difficult technical problems, and taking ownership.
You don't need to know every technology in our stack.
Strong fundamentals, production experience, and the ability to learn quickly matter more than matching every keyword.
If you've built, shipped, scaled, or debugged complex production systems, we'd love to hear from you.
Experience: 5+ years
Location: Remote
Working hours: EU
Email you CV at hr@gunasys.com
