Full-Stack Engineer

Costory; Paris; Sur place; EUR 45 000 - 65 000; Plein temps

Avantages offerts par ce poste

Real ownership in your projects

High-growth environment

Remote policy with office days

Résumé du poste

A cloud cost management startup is seeking a Full Stack Engineer to build intuitive interfaces and APIs for cloud data management. You will work on developing high-performance user interfaces and integrating tools like Slack and Microsoft Teams to streamline FinOps processes. Ideal candidates should have 1+ years of experience, proficiency in TypeScript, and a solid understanding of React. This role offers a fast-paced environment with real ownership of projects, allowing you to ship code to production quickly.

Qualifications

• 1+ year of experience building full-stack web applications.
• Proficiency in TypeScript across frontend and backend.
• Solid grasp of React and state management.

Responsabilités

• Build interfaces and APIs that turn complex cloud data into actionable stories.
• Work on high-performance UI to provide clear insights from massive datasets.
• Develop integrations for tools like Slack and Microsoft Teams.

Connaissances

TypeScript proficiency

React

State management

RESTful APIs in Express

ORM modeling (Prisma)

Outils

Node.js

Prisma

Slack integration

Microsoft Teams integration

PostHog

Description du poste

We’re building the FinOps Assistant we wish we had as large cloud clients. After managing multi-million dollar budgets across GCP, AWS, and Datadog , we know how painful cloud cost management can be. FinOps often falls on senior engineers, forced to manually monitor costs and investigate spikes with little context.

We believe FinOps and engineering teams shouldn’t waste time digging through billing consoles and dashboards. LLMs alone won’t solve anomaly detection or cost allocation —the real challenge is adding context to messy billing data. That’s why we’re building an agent that correlates costs with technical and product events , explains changes, and surfaces insights directly where teams work , so they can focus on optimization.

Long-term, our vision is to shift FinOps left , just like SecOps. Engineers should understand cost impact as they build , not after the fact. Costory becomes their co-pilot—helping them make smarter trade-offs between performance, reliability, and cost early in the development cycle .

Your Mission:

As a Full Stack Engineer, you will be responsible for building the interfaces and APIs that turn complex cloud data into intuitive, actionable stories. You’ll bridge the gap between our data engine and the end-user, ensuring that a DevOps lead or a CFO can understand their cloud spend in seconds.

What You’ll Be Working On

Project 1: The Ultimate FinOps Interface

The Goal: Ship features that make Costory the most intuitive FinOps tool available.

The Focus: You will work on reducing "Time to Information." You'll build high-performance UI to turn massive datasets into clear, actionable insights. Your mission is to make complex cloud billing feel "easy" for the end-user and the most intuitive.

Project 2: Ecosystem & Agent Integrations

The Goal: Ensure our users don't lose a second "doing" FinOps by bringing the data to them.

The Focus: You will build and ship integrations for Slack, Microsoft Teams, and MCP (Model Context Protocol) . You’ll leverage Node.js, Prisma, and LLM APIs to push critical cost alerts and automated reports directly into the tools engineers and finance teams already use daily.

Frontend: React, Mantine UI, TanStack Query (React Query).

Analytics: PostHog

What We’re Looking For

1+ Year of Experience: You have at least one year of professional experience (including long-term internships or apprenticeships) building and maintaining full-stack web applications.

TypeScript Proficiency: You are comfortable working in a type-safe environment across the frontend and backend.

Frontend Savvy: You have a solid grasp of React and state management. Experience with TanStack Query (React Query) and UI libraries like Mantine is a significant plus.

Backend Foundations: You understand how to design RESTful APIs in Express and have experience modeling data using an ORM (ideally Prisma ).

The "Builder" Mindset: You are proactive, take ownership of your features, and prefer shipping over perfectionism.

Startup Ready: You’re excited about the fast-paced, sometimes ambiguous environment of a young company.

What We Offer

Real Ownership: you'll be shipping code to production in your first week.

High-Growth Environment: Help scale a product from 0 to 1.

Remote Policy: at least 10 days per month at the office