Senior .NET Backend Developer, C#/.NET Core, Fintech

HumanIT Digital Consulting

Senior .NET Backend Developer in a high-stakes fintech environment. Building and supporting backend services in a live production context with a focus on scalability and security.

Posted 6/3/2026full-timeRemote • 🇵🇹 PortugalSenior💰 €2,050 - €2,700 per monthWebsite

Tech Stack

Tools & technologies

.NETOracleSQL

About the role

Key responsibilities & impact

You'll be working on backend services and application integrations within a fintech platform, connecting back-office systems with in-house and third-party applications
The environment is live and demanding — you'll be expected to design, build, and support production-grade systems where traceability, security, and data integrity are critical
The stack centres on modern .NET, with RESTful APIs, domain-driven service architecture, and SQL Server or Oracle data layers

Requirements

What you’ll need

At least 4+ years of C# and .NET backend development experience in production environments
Minimum 2 years of hands-on experience with .NET Core 8 or .NET 10
Proven experience in application integration — connecting back-office systems with in-house and third-party platforms
Strong command of RESTful API design and domain-driven service architecture principles
Mandatory: prior hands-on experience in fintech, trading, or brokerage projects — this is a hard requirement, not a nice to have
Experience optimising database queries and data access layers in SQL Server or Oracle
Solid knowledge of secure coding practices and financial data handling requirements
Familiarity with API versioning, OAuth/JWT authentication , and integration patterns
Experience supporting live production systems — tracing issues, diagnosing root causes, and delivering fixes under pressure
Ability to deliver scalable, maintainable backend services using modern .NET practices
Strong problem-solving and analytical skills with the ability to work independently across multiple workstreams
Clear communication skills in English (B2 or above)

Benefits

Comp & perks

15th month salary
Health insurance covering your family
Birthday off
Mobility program for digital nomads
Real work-life balance

ATS Keywords

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Hard Skills & Tools

C#.NET.NET Core 8.NET 10RESTful API designdomain-driven service architectureSQL ServerOraclesecure coding practicesdatabase query optimization

Soft Skills

problem-solvinganalytical skillsindependent workclear communication