Senior Full-Stack Engineer (JVM + TypeScript)

OnHires; Barcelona; A distancia; EUR 70.000 - 90.000; Jornada completa

Descripción de la vacante

A fast-growing tech startup is seeking a Software Engineer to join their remote team. The role involves end-to-end feature development, backend and frontend work, and integration with cloud infrastructure. Candidates should have 8+ years of experience and strong skills in languages like Go or Kotlin. The company offers stock options, unlimited PTO, and a culture that values high ownership and flexibility.

Servicios

Stock options

100% remote work

Unlimited PTO

Collaborate with top engineers

Formación

• 8+ years of experience in software engineering required.
• Strong backend expertise is essential.
• English: Upper-Intermediate or higher.

Responsabilidades

• Build features end-to-end across backend and frontend.
• Contribute to browser/IDE plugins and dev-facing tools.
• Participate in code reviews and mentor other engineers.

Conocimientos

Backend expertise in Go, Kotlin, Java, or Scala

Experience with RESTful APIs

Solid frontend skills with TypeScript

Familiarity with cloud infrastructure and Kubernetes

Herramientas

Kubernetes

GCP

PostgreSQL

Docker

GitHub Actions

Descripción del empleo

Remote | Globally Distributed Team

Data Platform / DevTools Product

Full-time | Long-term | Stock Options Included

What You’ll Work On

• Build features end-to-end — from data processing and APIs to frontend components like browser extensions and IDE plugins.
• The focus is backend-heavy, but solid frontend skills are required for delivering user-facing developer tools.
• Build and own features across backend, APIs, and frontend
• Develop internal and public APIs
• Integrate with the company’s data platform
• Contribute to browser / IDE plugins and dev-facing tools
• Support CI / CD pipelines and cloud-based delivery
• Collaborate with the infrastructure team (Kubernetes, GCP)
• Write well-tested, maintainable code
• Participate in code reviews and mentor other engineers

Tech Stack

• Primary Backend: Go, Kotlin, Java, or Scala — language flexibility is welcome; JVM experience is especially valued
• Frontend: TypeScript + any modern JS framework (React, Vue, Angular, Svelte — all accepted)
• Infrastructure: Kubernetes, Terraform, Docker, GCP
• Data Layer: PostgreSQL
• DevOps: CI / CD pipelines, GitHub Actions, CircleCI

You Might Be a Great Fit If You Have

• 8+ years of experience in software engineering
• Strong backend expertise (Go, Kotlin, Java, or Scala)
• Hands-on experience with RESTful APIs and data-heavy applications
• Familiarity with cloud infrastructure and Kubernetes
• Solid frontend skills (TypeScript, integration-level — no need for deep UI work)
• Ability to deliver production-ready features end-to-end
• Comfortable working across the stack and switching layers as needed
• Experience with developer tools or data platforms is a plus
• English: Upper-Intermediate or higher

What’s In It for You

• Stock options in a fast-growing, VC-backed startup
• 100% remote team with async-friendly culture
• Collaborate with world-class engineers from NASA, Meta, MIT, AWS
• Work on a high-impact devtools product used by engineering and security teams
• Unlimited PTO and flexible hours
• High ownership, zero micromanagement, no legacy

Interview Process

• Recruiter screening (30 mins)
• CEO interview
• Math interview
• Technical interview #1 (live coding)
• Technical interview #2 (live coding)
• Final interview with CTO / co-founder

Interested?

Apply now or message us directly — we’ll be happy to share more about the role, product, and team. Let’s build something exceptional together.