Senior Full-Stack Developer (.NET, React, AWS)

Trinetix

Poland Remote permanent

Posted: January 28, 2026

Required Skills

Job Description

We are seeking a Senior Full-Stack Developer to build and evolve scalable, cloud-native applications that support fleet optimization and operational efficiency across a large-scale vehicle network of 46,000+ assets in 545+ locations. You will work hands-on across front-end and back-end systems, collaborating closely with product, architecture, data, and business stakeholders to deliver high-quality solutions deployed on AWS.

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

Core Responsibilities

• 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

What we offer

• Continuous learning and career growth opportunities
• Professional training and English/Spanish language classes
• Comprehensive medical insurance
• Mental health support
• Specialized benefits program with compensation for fitness activities, hobbies, pet care, and more
• Flexible working hours
• Inclusive and supportive culture

About Us

Established in 2011, Trinetix is a dynamic tech service provider supporting enterprise clients around the world.

Headquartered in Nashville, Tennessee, we have a global team of over 1,000 professionals and delivery centers across Europe, the United States, and Argentina. We partner with leading global brands, delivering innovative digital solutions across Fintech, Professional Services, Logistics, Healthcare, and Agriculture.

Our operations are driven by a strong business vision, a people-first culture, and a commitment to responsible growth. We actively give back to the community through various CSR activities and adhere to international principles for sustainable development and business ethics.

To learn more about how we collect, process, and store your personal data, please review our Privacy Notice: https://www.trinetix.com/corporate-policies/privacy-notice

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