Trinetix

Senior Full-Stack Developer – .NET, React, AWS

Trinetix

full-time

Posted on:

Location Type: Hybrid

Location: Warsaw • Poland

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Job Level

Senior

Tech Stack

AWSCloudMicroservices.NETNoSQLReactTerraform

About the role

  • Develop and maintain end-to-end features across React front-end and .NET back-end services
  • Build scalable, maintainable APIs and business logic supporting fleet optimization workflows
  • Implement responsive, user-friendly interfaces with a strong focus on performance and usability
  • Integrate applications with cloud infrastructure, data platforms, and enterprise systems
  • Collaborate with Solution Architects to implement architectural patterns and best practices
  • Ensure code quality through reviews, automated testing, and adherence to engineering standards
  • Troubleshoot, optimize, and improve system performance, reliability, and scalability
  • Support deployments and production operations on AWS
  • Work closely with product and business teams to translate requirements into production-ready solutions

Requirements

  • 5+ years of experience in full-stack software development
  • Strong hands-on experience with .NET (C#) for backend services and APIs
  • Solid experience building modern front-end applications using React
  • Proven experience designing and consuming RESTful APIs
  • Good understanding of cloud-native application development on AWS
  • Experience working with relational and/or NoSQL databases
  • Strong understanding of software engineering best practices (clean code, testing, performance, security)
  • Experience working in agile, cross-functional teams
  • Ability to collaborate effectively with architects, data engineers, and business stakeholders
  • Nice-to-haves:
  • - Experience with microservices architectures
  • - Familiarity with AWS services such as ECS/Fargate, Lambda, API Gateway, S3, SNS/SQS
  • - Experience with event-driven architectures
  • - Exposure to CI/CD pipelines and Infrastructure as Code (Terraform or CloudFormation)
  • - Experience integrating frontend applications with data or analytics platforms
  • - Familiarity with authentication and authorization mechanisms (OAuth2, JWT, enterprise SSO)
  • - Experience working with high-load or enterprise-scale systems
Benefits
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Applicant Tracking System Keywords

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Hard Skills & Tools
.NETC#ReactRESTful APIsAWSrelational databasesNoSQL databasesmicroservicesCI/CDInfrastructure as Code
Soft Skills
collaborationcommunicationproblem-solvingagile methodologiesteamworkadaptabilityattention to detailcritical thinkingtime managementstakeholder engagement