Full Stack Engineer (React/Node/C#) - Contractor

CRU; Polska; On-site; PLN 200,000 - 280,000; Full time

Job summary

CRU is seeking an experienced Full Stack Engineer Contractor to deliver a data-heavy commodity intelligence platform. You will own features from SQL queries through React components and deployment on Azure, using a modern TypeScript stack.

Work with Data Engineering to shape schemas, deploy via GitHub Actions, and apply AI tooling to improve the development process while ensuring security and performance in production environments.

Qualifications

• Experience owning features from database queries to frontend delivery.
• Experience with data-heavy platforms and AI tooling in workflows.
• Ability to work in an async-first distributed team.

Responsibilities

• Deliver full-stack features via SQL, NestJS GraphQL, Apollo hooks, and React in Next.js.
• Collaborate with Data Engineering to align schemas and data models.
• Deploy and support features on Azure App Services and Functions using GitHub Actions.
• Translate assets, costs, and valuations into testable features.
• Apply AI tooling in development while validating outputs.
• Prioritize testing, security, and performance for production readiness.
• Communicate technical details to non-technical stakeholders and manage delivery risks.

Skills

Strong written communication

Async teamwork

End-to-end ownership

Problem solving

Curiosity about business domain

Explain technical details

Delivery risk management

Quality mindset

Tools

TypeScript

Node.js

NestJS

GraphQL

React

Next.js

Azure App Services

Azure Functions

GitHub Actions

Terraform

Vitest

AI tooling

Job description

Direct applications only. We are seeking applications from individual contractors who will personally provide the services. No recruitment agencies, consultancies or third-party suppliers, please

CRU is looking for an experienced Full Stack Engineer Contractor to support the delivery of a business-critical commodity intelligence platform.

Help evolve a business-critical, data-heavy platform into an AI-augmented product used by analysts, traders and strategists across global commodity markets. You’ll own features from database query through application development and deployment on Azure, working across a modern TypeScript stack and a complex, data-rich business domain.

Key Responsibilities:

• Deliver full-stack features from SQL queries and NestJS GraphQL services to Apollo hooks and React components in Next.js.
• Partner with Data Engineering, which owns the schemas and data model, to build reliable product features.
• Deploy and support features on Azure App Services and Azure Functions using GitHub Actions; extend Terraform infrastructure as needed.
• Explore the database and user interface to understand assets, commodities, cost stages, emissions scopes and valuations, translating requirements into clear, testable features.
• Use AI tooling in the engineering workflow, help improve team practices, and critically validate AI-generated work.
• Build with testing, security, permissions and performance in mind, and contribute to enterprise readiness.
• Help manage delivery risks, issues and dependencies, and communicate technical details to non-technical stakeholders.

Skills & Experience:

• Strong written communication and the ability to contribute effectively in an async-first, distributed team.
• Proactive end-to-end ownership, with accountability for how features behave in production and in front of users.
• Curiosity about business domains and a willingness to explore data and the product to clarify requirements.
• Strong communication skills, including the ability to explain complex technical details to non-technical stakeholders.
• Experience helping manage delivery risks, issues and dependencies.
• A quality mindset, with testing, security and performance considered part of completing a feature.
• Daily use of AI tools, with the judgement to set team context and rules and critically validate generated outputs.

Technical Skills:

Must-have:

• TypeScript, including strong strict-typing practices.
• Node.js and NestJS, including services, modules, dependency injection and code‑first GraphQL.
• GraphQL resolvers, pagination, error handling and awareness of N+1 query issues.
• SQL, including joins, aggregations, window functions and reading query plans.
• React 18 and Next.js 16 (App Router), including feature delivery, Apollo cache debugging and front‑end pull‑request review.
• Azure App Services and Azure Functions, including configuration, deployment slots, triggers, bindings, logs and troubleshooting deployed environments.
• GitHub Actions, including reading, debugging and extending build, test and deployment workflows, environments and secrets.
• Terraform, including navigating existing modules, proposing changes through pull requests and confidently reviewing plans.
• Vitest; write unit tests by default and understand the trade‑offs between unit, integration and end‑to‑end testing.
• Daily use of at least one modern AI coding tool, such as Cursor or Claude Code.

Nice to have:

• Commercial C#/.NET experience with ASP.NET Core Web APIs and Entity Framework.
• ClickHouse experience, including the MergeTree family, materialised views, argMax, groupArray, projections, skipping indexes and query introspection.
• Experience writing efficient queries and reasoning about performance on large datasets.