Senior Fullstack Engineer (Golang)

N-iX; España; Híbrido; EUR 50.000 - 70.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive compensation package

Opportunities for professional development

Flexible working format

Education reimbursement

Descripción de la vacante

N-iX is looking for a Senior Full Stack Engineer in Spain. In this role, you will design and implement APIs in Go and build user-facing features in React. Collaborating with a cross-functional team, you'll ensure high performance experiences for users. Ideal candidates will have 5+ years in software development with strong experience in backend APIs, JavaScript, and React. The position offers flexible working options and competitive compensation alongside a collaborative workplace culture.

Formación

• 5+ years of professional experience in software development.
• Strong experience building backend APIs and services in Go.
• Proven experience with React as a primary frontend framework.

Responsabilidades

• Design, develop, and maintain backend services and APIs in Go.
• Build responsive single page applications using React and Redux.
• Implement clean, reusable UI components for good user experience.

Conocimientos

Go

JavaScript

React

Redux

HTML5

CSS3

AWS

REST APIs

NoSQL

Automated Testing

Herramientas

Docker

Descripción del empleo

About our client

Our client builds a leading digital identity and fraud prevention platform used by banks, fintech companies, online marketplaces, and other regulated businesses worldwide. Their products combine biometric identity verification, document and image processing, and advanced fraud detection to help customers balance frictionless digital experiences with strong security and regulatory compliance. The company relies on AI, machine learning, and computer vision to power identity verification, mobile deposit, and liveness detection solutions used by thousands of organizations.

About the role

We are looking for a Senior Full Stack Engineer who is comfortable working across backend services in Go and modern web front ends. You will join a cross functional team that builds cloud native identity and fraud products on AWS. Your responsibilities will span from designing and implementing APIs in Go to building user facing features in modern JavaScript frameworks, ensuring secure, high performance experiences for both internal and external users.

What will you do?

• Design, develop, and maintain backend services and APIs in Go running on AWS using microservice and or serverless patterns.
• Build responsive single page and web applications using React and Redux and integrate them with backend APIs.
• Implement clean, reusable UI components and ensure good user experience, performance, and accessibility.
• Write and maintain automated tests for both backend and frontend parts of the solution and contribute to CI and CD automation.
• Work closely with designers, product managers, QA, and other engineers to refine requirements and deliver features end to end.
• Participate in technical design and architecture discussions and help define interfaces between services and front end applications.
• Contribute to documentation of APIs, front end components, and key technical decisions.
• Take part in Agile ceremonies and actively drive improvements in team processes and engineering practices.

Required skills and experience

• 5+ years of professional experience in software development, including significant time in full stack roles.
• Strong experience building backend APIs and services in Go
• Solid knowledge of JavaScript and proven experience with React as a primary frontend framework.
• Experience with a state management solution such as Redux, MobX or similar.
• Good understanding of HTML5, CSS3, and common UI patterns and best practices.
• Experience deploying and operating applications on AWS or another major cloud platform
• Practical experience designing and consuming REST APIs and familiarity with web security concepts such as authentication, authorization, and secure data handling.
• Experience working with relational and or NoSQL databases (DocumentDB is preferred).
• Strong communication skills and ability to collaborate effectively in a distributed environment.
• Knowledge of server side rendering frameworks or micro frontend architectures.
• Experience writing and maintaining automated tests for backend and frontend applications.
• Experience with microservices and serverless design patterns.

Nice to have

• Experience with TypeScript and more advanced frontend architecture patterns.
• Experience with Docker and CI/CD pipelines.
• Experience integrating with complex backends using gRPC or Protocol Buffers.
• Exposure to image processing, data pipelines, or machine learning powered features.
• Experience with Java as an additional backend language.
• Experience working in Agile product teams and methodologies.
• Previous work on SaaS products at scale in domains like digital identity, banking, or fintech.

What we offer

• Competitive compensation package and comprehensive benefits.
• Opportunities for professional development within an innovative international environment.
• Collaborative workplace culture using the latest technologies.

We offer

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits
• not applicable for freelancers