Full-Stack Developer (React, .Net)

Software Mind; Województwo mazowieckie; Remote; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Language classes

Knowledge sharing initiatives

Private healthcare and life insurance

Multisport card

Job summary

Software Mind is seeking an experienced frontend developer to join a next-generation risk analysis platform. You will craft analyst-facing interfaces using React and TypeScript, integrate with .NET backends, and optimize large datasets with smart data fetching and virtualization.

You will work with AI coding tools and maintain rigorous testing while ensuring PCI data handling and secure sessions. Remote-friendly and international projects are offered.

Qualifications

• 3–5 years of commercial software development with React/TypeScript.
• Production experience building data-heavy UIs (tables, grids and charts).
• Proficient in C#/.NET and ASP.NET Core Web API; SQL for endpoint changes.
• Experience with REST API integration using typed clients and server-state libraries.
• Hands-on with agentic AI coding tools (Claude Code, Copilot, etc.) and testing frameworks.

Responsibilities

• Build and ship production React and TypeScript features for risk analyst interfaces (transactions, merchants, risk views, queues).
• Extend C#/.NET endpoints behind features within API contracts owned by a senior developer.
• Integrate frontend with platform APIs; manage loading, error, pagination and caching states.
• Keep large datasets fast with virtualized tables and memoization; perform profiling.
• Write tests (unit, component, integration, e2e) and review AI-generated code for production readiness.
• Respect PCI boundaries: masked/tokenized data, secure sessions and token handling.
• Collaborate with client team, attend stand-ups, document decisions, ensure clean handoffs and CI/CD conventions.

Skills

React

TypeScript

C#/.NET

ASP.NET Core

REST API

Testing

AI tools

Data visualization

Docker

CI/CD

Tools

TanStack Table

AG Grid

Recharts

ECharts

Job description

Company Description

Software Mind develops solutions that make an impact for companies around the globe. Tech giants & unicorns, transformative projects, emerging technologies and limitless opportunities – these are a few words that describe an average day for us. Building cross-functional engineering teams that take ownership and crave more means we’re always on the lookout for talented people who bring passion and creativity to every project. Our culture embraces openness, acts with respect, shows grit & guts and combines cooperation with enjoyment.

Job Description

Project – the aim you’ll have

Join a next-generation risk analysis and scoring platform built for a payments technology company. The platform combines the client’s own risk rules with AI-driven, pre-scored risk feeds from a global card network. You’ll build the analyst-facing interfaces where risk teams review transactions and merchants and work their alert queues, in a small AI-first delivery team alongside a backend-leaning senior developer.

Role – How You’ll Contribute

• Build and ship production React and TypeScript features for risk analyst interfaces: transaction and merchant risk views, score explanations, alert queues, data-heavy tables, filters and charts
• Extend the C#/.NET endpoints behind your features (new fields, filters, endpoints) within API contracts owned by the senior developer
• Integrate the front end with platform APIs, handling loading, error, pagination and caching states cleanly
• Keep large-dataset UIs fast through virtualized tables, smart data fetching, memoization and regular profiling
• Use Claude Code or an equivalent agentic coding tool as your primary accelerator while owning the quality of every line merged
• Write unit, component, integration and end-to-end tests, and review and harden AI-generated code before it reaches production
• Respect the PCI boundary across the stack: masked and tokenized card data only, secure session and token handling
• Work closely with the client’s internal team: stand-ups, documented design decisions, clean handoffs, CI/CD and repo conventions

Qualifications – Expectations – the experience you need

• 3–5 years of commercial software development, including at least 3 years of production React and TypeScript (hooks, state management, Vite or Next.js)
• Experience building data-heavy UIs: tables, grids and charts over large datasets (e.g. TanStack Table, AG Grid, Recharts, ECharts)
• Working proficiency in C#/.NET: ASP.NET Core Web API, EF Core or Dapper, and enough SQL to change endpoints safely
• REST API integration with typed clients and server-state libraries such as TanStack Query
• Daily, hands-on use of agentic AI coding tools (Claude Code, Cursor, Copilot Workspace, Codex or similar) – you’ll demo your workflow live
• Testing discipline: Jest or Vitest, React Testing Library, Playwright or Cypress, xUnit or NUnit
• Solid frontend fundamentals: modern CSS, accessibility (WCAG), browser performance and web security (XSS, CSP, token handling)
• Docker and Docker Compose, Git, CI/CD (Azure DevOps, GitHub Actions or similar)

Additional Skills – The Edge You Have

• Payments, card processing, risk/fraud or financial services experience, ideally with PCI-scoped applications
• Design systems and component libraries (MUI, Fluent UI) and Storybook
• Advanced data visualization (D3, time-series and distribution charts) or UIs for LLM-backed features
• Identity in SPAs: OAuth2/OIDC, MSAL / Microsoft Entra ID
• Prior consulting or staff-augmentation experience embedded in a client team

Additional Information

What We Offer

• Flexible and remote cooperation options
• International projects with leading global clients
• Travels related to international projects
• Non-corporate atmosphere
• Access* to language classes
• Access* to knowledge-sharing initiatives
• Access* to private healthcare and life insurance
• Access* to multisport card
• The availability and terms of individual benefits may vary depending on the chosen form of cooperation.