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Open nowPosted 43 days ago

Senior .NET Backend Developer

nexttech5 open roles

Where
Cluj-Napoca
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Your applicationOpen nowSenior .NET Backend Developernexttech · Cluj-Napoca

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Early applications get read.

11.8% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
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  2. 4.4%3 days
  3. 11.8%7 days
  4. 18.6%14 days
  5. 35.6%30 days
  6. 45.1%60 days
This job: posted 43 days ago

The posting

About Nexttech

Founded in 2015, Nexttech has built a solid foundation in delivering comprehensive IT solutions tailored to meet diverse client needs. With expertise spanning five key industry sectors—Banking, Energy, Telecom, Automotive and E-commerce & Logistics—we provide nearshore and onshore services designed to drive efficiency and support strategic growth.

Our team supports every phase of the Software Development Life Cycle (SDLC), from developing detailed roadmaps and resolving complex software challenges to ensuring quick time-to-market and optimized ROI.

Our Core Services:

• Managed Services: End-to-end support for seamless IT operations. • Custom Software Development: Tailored solutions to address specific business challenges. • Team Augmentation: Enhance your in-house capabilities with specialized expertise. • Nearshoring Services: Collaborative solutions that offer the benefits of proximity and cultural alignment. • Dedicated Development Teams: Aligned teams committed to your project’s long-term success. • Quality Assurance & Testing: Ensuring high-quality performance and reliability. • Consulting and Advisory Services: Expert insights to help navigate complex projects and decisions.

At Nexttech, we take pride in our commitment to client success, fostering trusted partnerships, and delivering solutions that align with each client’s unique goals and vision.

JOB DESCRIPTION

We are looking for a Senior .NET Backend Developer to design, build and evolve secure, scalable and reusable backend services for business-critical enterprise applications. This role is ideal for an experienced, hands-on engineer with strong expertise in C# and .NET, enterprise API design, system integration and cloud-native delivery.

Main tech: #CSharp #NET #ASPNETCore #RESTAPIs #Oracle #Kafka #Docker #OpenShift #Kubernetes #Microservices

Key Responsibilities

Backend Development & API Design

• Design, develop and maintain backend applications and services using C#, .NET and ASP.NET Core • Translate business and technical requirements into clear, maintainable and testable solutions • Design and implement REST APIs with clear, versioned contracts using OpenAPI / Swagger • Develop reusable integration capabilities and avoid application-specific point-to-point solutions • Create and maintain technical documentation, API specifications and implementation notes

Enterprise Integration & Data

• Design synchronous, asynchronous and event-driven interaction patterns based on solution needs • Integrate applications using Apache Kafka or equivalent enterprise messaging platforms • Develop and optimize database interactions with Oracle and other relational databases • Ensure backward compatibility, idempotency, transactional consistency and resilient error handling • Identify and resolve database, integration and application-performance issues

Architecture, Security & Quality

• Apply appropriate architectural patterns, including Clean Architecture, Domain-Driven Design and event-driven architecture • Implement authentication and authorization using OAuth 2.0, JWT and enterprise access-management solutions • Build automated unit, component and integration tests using xUnit, NUnit, Moq or equivalent frameworks • Participate in code reviews and contribute to clean-code, security, performance and engineering-quality standards • Address scalability, availability, latency, resiliency, auditability and maintainability requirements

Cloud-Native Delivery & Observability

• Containerize applications and support delivery through Docker and Kubernetes / OpenShift platforms • Contribute to CI/CD pipelines and build automation using GitHub Actions or equivalent tooling • Implement structured logging, metrics and distributed tracing aligned with organizational standards • Troubleshoot deployment, configuration and runtime issues in non-production environments • Collaborate closely with solution architects, technical leads, business analysts, QA engineers and other development teams

What will drive your success?

• Minimum 7 years of professional software development experience in enterprise environments • Minimum 5 years of hands-on backend development experience with C# and .NET / .NET Core • Minimum 3 years of hands-on experience with ASP.NET Core • Strong experience designing and implementing REST APIs and system-to-system integrations • Hands-on experience with Oracle, SQL and relational database technologies • Practical experience with Apache Kafka or other messaging and event-driven platforms • Strong understanding of object-oriented programming, SOLID principles, design patterns and clean-code practices • Experience with Entity Framework Core or equivalent persistence technologies • Hands-on experience with Docker and Kubernetes and/or OpenShift • Strong automated-testing skills using xUnit, NUnit, Moq or equivalent tools • Working knowledge of OAuth 2.0, JWT and enterprise identity and access-management integration • Experience applying Clean Architecture, Domain-Driven Design and event-driven architecture • Good understanding of distributed-system failure scenarios, resiliency and performance considerations • Experience working in Agile, cross-team and multi-system delivery environments • Strong analytical thinking, autonomy, ownership and delivery discipline • Ability to communicate technical decisions clearly and challenge unclear or inefficient solutions

Nice to Have

• Experience in banking, financial services or another highly regulated industry • Experience with payments, lending, customer-data, core systems or enterprise integration platforms • Familiarity with OpenTelemetry and observability tools such as Elastic, Prometheus or Grafana • Experience with caching strategies, cache invalidation and performance optimization • Familiarity with enterprise security, auditability, data-protection and controlled-delivery requirements • Practical experience with Microsoft Copilot or another enterprise-approved generative AI assistant • Understanding of confidentiality, data-classification and safe-use requirements when working with AI tools

Our Culture: What Sets Us Apart

At Nexttech, we don’t rely on polished platitudes; instead, we let our team members’ voices speak to the essence of who we are:

• “An organization that always listens to feedback from employees, continuously improving based on input and suggestions.” • “A culture that encourages work-life balance and independence at work.” • “A place where genuine communication and respect thrive between all levels of the company.” • “An organization that’s close to people, where kindness and support are constants.” • “A culture that makes new members feel welcomed, involved in day-to-day decisions, and valued for their unique skill set from day one.” • “A team that promotes psychological safety and the confidence to speak your mind without fear.”

Join Us and Bring Your Full Self to Work

We promise an environment where respect, openness, and recognition are at the core of your experience. Here, you’ll find a collaborative and responsible team that values fun, autonomy, and flexibility. You’ll face challenges that allow you to grow, supported every step of the way by peers and leadership alike.

What We Look for in You:

If you possess strong technical expertise, a product mindset, a collaborative spirit, and a proactive attitude, along with resilience, flexibility, and a desire to support your teammates, you’ll fit right in at Nexttech.

Come be part of a place where your effort is valued, your ideas are heard, and your growth is our priority. 🚀

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