Senior Fullstack Engineer (Golang)

N-iX; Poland; Hybrid; PLN 60,000 - 90,000; Full time

Benefits offered by this job

Competitive compensation package

Flexible working format

Professional development tools

Education reimbursement

Corporate events and team buildings

Job summary

N-iX in Poland is seeking an experienced Senior Full Stack Engineer to join a cross-functional team focused on building cloud-native identity and fraud prevention products. The ideal candidate will have over 5 years of professional experience, strong skills in Go for backend development, and proficiency in modern JavaScript frameworks like React. The role offers a flexible working environment and a competitive compensation package, emphasizing professional development and collaboration in a supportive culture.

Qualifications

• 5+ years of professional experience in software development.
• Strong experience building backend APIs and services in Go.
• Solid knowledge of JavaScript and proven experience with React.

Responsibilities

• Design and develop backend services and APIs in Go.
• Build responsive applications using React and integrate with APIs.
• Write and maintain automated tests for the entire solution.

Skills

Back End development in Go

React

AWS deployment

REST APIs

Microservices design patterns

Tools

Docker

CI/CD pipelines

Job description

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