Full Stack Developer - End-to-End Feature Delivery

BELVEDERE; Warszawa; Hybrid; PLN 180,000 - 260,000; Part time

Job summary

BELVEDERE is seeking a seasoned Full Stack Developer in Warsaw on a 2-month hybrid contract. You will own end-to-end feature delivery across backend APIs, React frontend, and cloud services, leveraging .NET Core, TypeScript, and Azure.

You will contribute to design, security, and reliability while collaborating with cross-functional teams to deliver robust financial platforms. Ideal candidates have 6–8 years of experience, strong C#, ASP.NET Core, React, and database modeling skills, with a

Qualifications

• 6–8 years of software development experience.
• Proven experience building ASP.NET Core Web APIs.
• Solid React and TypeScript skills for frontend work.
• Experience with SQL and NoSQL databases and data modelling.
• Cloud platforms knowledge (Azure preferred) and secure API design.
• Strong debugging and end-to-end problem-solving abilities.

Responsibilities

• Design and implement backend APIs and business logic with .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 across backend, frontend and integration boundaries.
• Troubleshoot production issues across multiple layers.
• Contribute to code reviews, testing strategies and technical quality.
• Support integration with external systems and cloud-connected services.
• Apply security best practices including secure API design and tenant-boundary thinking.

Skills

ASP.NET Core

C#

React

TypeScript

Azure

SQL

NoSQL

Security best practices

Full stack

Tools

MongoDB

Azure SQL

Job description

Full Stack Developer - End-to-End Feature Delivery

Location: Warsaw

Contract Type:2 MonthsJobType:Hybrid

• Build complete business features across backend APIs, React frontend, and cloud services

• Work with modern tech stack including .NET Core, TypeScript, Azure, and both SQL and NoSQL databases

• Solve complex technical challenges across multiple application layers

• Contribute to code quality through reviews, testing, and security-focused development

Company Overview

Our client is an established technologyorganisationdelivering 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 onmodernisinglegacy systems while maintaining high standards for code quality and system reliability.

They'relooking 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 directlyimpact how financialorganisationsmanage risk, compliance, and reporting.

Position Overview

As a Full Stack Developer,you'lltake ownership of delivering complete business features from concept through to production. You'llwork across the entire technology stack, designing and implementing backend APIs, building frontend interfaces with React and TypeScript, and integrating with cloud services. This role requires someone who can work independently on complex tasks while collaborating with cross-functional teams to deliver high-quality solutions that meet security and performance standards.

Responsibilities

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

• Build and integrate frontend functionality using React and TypeScript

• Model data andoptimisequeries 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

• Strongproficiencyin .NET and C# fundamentals

• Proven experience building ASP.NET Core Web APIs

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

• Experience with both SQL and NoSQL databases, including data modelling and queryoptimisation(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 frontendmodernisationin enterprise systems

• Knowledge of design system migrations or enterprise UI transitions

Benefits

While specific benefits details are beingfinalised, this contract role offers competitive day rates reflective of the technical complexity and experiencerequired. You'llwork within a technically focused environment where code quality, security, and system reliability areprioritised, collaborating with experienced engineers committed to delivering robust solutions for the financial services sector.