Full Stack Developer - End-to-End Feature Delivery @ Belvedere Recruitment

Belvedere Recruitment; Warszawa; Hybrid; PLN 335,000 - 469,000; Full time

Job summary

Belvedere Recruitment seeks an experienced Full Stack Developer to join their Warsaw-based team on a 2-month contract, hybrid work setup. You will design backend APIs with .NET/C#, and deliver frontend features using React and TypeScript.

You’ll model data across SQL/NoSQL databases and ensure secure API design while integrating cloud services. The role emphasizes end-to-end ownership, collaboration with cross-functional teams, and delivering robust, security-conscious solutions for financial

Qualifications

• 6-8 years of software development experience.
• Strong proficiency in .NET and C# fundamentals.
• Experience building ASP.NET Core Web APIs.
• Strong React and TypeScript skills.
• Experience with SQL and NoSQL databases and data modelling.
• Knowledge of cloud platforms and services.
• Security-aware with secure API design.
• Ability to work independently on end-to-end tasks.

Responsibilities

• Design and implement backend APIs and business logic using .NET and C#.
• Build and integrate frontend functionality using React and TypeScript.
• Model data and optimise queries across SQL and NoSQL databases.
• Deliver complete features spanning backend, frontend, and integration boundaries.
• Troubleshoot and resolve production issues across multiple application layers.
• Contribute to code reviews, testing strategies, and technical quality standards.
• Support integration with external systems and cloud-connected services.
• Apply security best practices including secure API design and tenant-boundary thinking.

Skills

.NET & C# fundamentals

ASP.NET Core Web API

React & TypeScript

SQL & NoSQL databases

Cloud platforms & services

Debugging & problem solving

Secure API design

Independent work

6-8 years experience

Tools

MongoDB

Azure SQL

Azure App Services

Azure Storage

Key Vault

Monitoring tools

Job description

Requirements

• Strong proficiency in .NET and C# fundamentals


• Proven experience building ASP.NET Core Web APIs


• Solid React and TypeScript skills with ability to build and modify frontend screens independently


• Experience with both SQL and NoSQL databases, including data modelling and query optimisation (or strong experience in one with ability to learn the other quickly)


• Working knowledge of cloud platforms and services


• Strong debugging and problem-solving abilities across full stack


• Security awareness including secure API design and common vulnerability identification


• Ability to work independently on complex end-to-end tasks


• 6-8 years of relevant software development experience

Desirable

• Experience with MongoDB and Azure SQL


• Familiarity with Azure services such as App Services, Storage, Key Vault, and monitoring tools


• Background in financial, tax, or compliance-related platforms


• Experience supporting frontend modernisation in enterprise systems


• Knowledge of design system migrations or enterprise UI transitions

Location

Warsaw

Contract Type

2 Months

Job Type

Hybrid

Responsibilities

• Design and implement backend APIs and business logic using .NET and C#


• Build and integrate frontend functionality using React and TypeScript


• Model data and optimise queries across SQL and NoSQL databases


• Deliver complete features spanning backend, frontend, and integration boundaries


• Troubleshoot and resolve production issues across multiple application layers


• Contribute to code reviews, testing strategies, and technical quality standards


• Support integration with external systems and cloud-connected services


• Apply security best practices including secure API design and tenant-boundary thinking

Requirements

• .NET


• C#


• Web API


• React


• TypeScript


• SQL


• NoSQL


• Cloud platform


• Data modelling


• MongoDB


• Azure SQL


• Storage


• Azure


• Design system


• UI


• Key Vault

Company Overview

Our client is an established technology organisation delivering business-critical platforms within the financial services sector. They focus on building robust, scalable solutions that support compliance, tax, and financial operations for enterprise clients. The company values technical excellence, security-first thinking, and cross-functional collaboration. Their engineering teams work on modernising legacy systems while maintaining high standards for code quality and system reliability.

Position Overview

They’re looking for an experienced Full Stack Developer to join their team in Warsaw on a contract basis. This role offers the opportunity to work on meaningful features that directly impact how financial organisations manage risk, compliance, and reporting.

Benefits

While specific benefits details are being finalised, this contract role offers competitive day rates reflective of the technical complexity and experience required. You’ll work within a technically focused environment where code quality, security, and system reliability are prioritised, collaborating with experienced engineers committed to delivering robust solutions for the financial services sector.