Sr Fullstack (Go/Java + React)

We are seeking a Full-Stack Software Engineer to join the Digital Platforms Engineering team of a leading digital currency platform that enables customers to buy, sell, and manage cryptocurrency through kiosks, a consumer portal, and enterprise products. In this role, you will work across backend services and frontend applications that support customer onboarding, transaction management, compliance workflows, and internal operational tools. You will build secure, scalable systems that power high-volume financial transactions in a regulated environment, collaborating closely with product managers, designers, engineers, and operations teams to deliver reliable, end-to-end solutions.

Responsibilities

• Design, build, and maintain full-stack features across frontend applications and backend services.
• Develop and maintain backend APIs that support onboarding, authentication, transaction lifecycles, and operational workflows.
• Build and enhance customer-facing and internal web applications.
• Integrate systems with third-party services and external providers.
• Implement secure authentication and authorization using OAuth 2.0 flows.
• Deliver scalable backend capabilities within a microservices environment.
• Ensure applications meet high standards for security, performance, reliability, and observability.
• Participate in code reviews, technical design discussions, and architecture decisions.
• Write and maintain clear technical documentation.

Tech Stack

• Backend: Go (Golang), Java
• Frontend: Next.js, React, TypeScript v5, Node.js
• APIs: RESTful APIs
• Databases: SQL, PostgreSQL
• Cloud & Infrastructure: AWS (including S3), Kubernetes, Helm, Terraform, containerized services
• Authentication & Identity: OAuth 2.0
• Observability: Grafana and other monitoring platforms
• Version Control & CI/CD: Git-based workflows and CI/CD pipelines
• Developer Tools: VS Code / Cursor

• 3+ years of experience as a software engineer working across frontend and backend systems.
• Strong experience building backend services in Go and/or Java.
• Proficiency with Node.js and TypeScript v5.
• Experience building frontend applications with Next.js, React, and TypeScript.
• Solid understanding of RESTful API design.
• Strong SQL skills and hands-on experience with PostgreSQL.
• Experience working in AWS environments.
• Familiarity with microservices and distributed backend systems.
• Experience with Kubernetes, Helm, and Terraform.
• Experience with monitoring and observability platforms such as Grafana.
• Experience debugging with VS Code and/or Cursor.

Preferred Qualifications

• Understanding of multi-threading and Go concurrency (goroutines).
• Experience integrating third-party APIs and external providers.
• Experience with webhooks and WebSockets.
• Software architecture and system design experience.
• Familiarity with authentication, authorization, and secure system design.
• Experience in fintech, crypto, payments, or other regulated industries.
• Experience building internal dashboards or operational tooling.
• Comfort using AI tools as part of the development workflow.

Additional Requirements

• Advanced English communication skills.
• Clear communication and a collaborative, ownership-oriented mindset.
• Comfort owning features end-to-end across the stack.

At Devsu, we believe in creating an environment where you can thrive both personally and professionally. By joining our team, you’ll enjoy:

• Paid holidays (based on client calendar)
• 15 business days of vacation
• Health allowance
• Annual learning budget
• Company-provided computer

Join Devsu and discover a workplace that values your growth, supports your well-being, and empowers you to make a global impact.