Senior Backend Engineer

Toptal

. Write elegant, efficient, and testable Ruby (and/or TypeScript) code that is easy to maintain and debug.

Posted 5/7/2026full-timeRemote • 🇪🇸 SpainSeniorWebsite

Tech Stack

Tools & technologies

CloudGraphQLJavaScriptKafkaNode.jsReactRubyRuby on RailsSQLTypeScript

About the role

Key responsibilities & impact

Write elegant, efficient, and testable Ruby (and/or TypeScript) code that is easy to maintain and debug.
Cover code with tests and perform manual testing of features, while reviewing the work of colleagues.
Work on the infrastructure part of the project, collaborating with Infrastructure Engineers.
As a true teammate, continuously improve the team’s processes, brainstorm ideas, communicate statuses, and progress.
Mentor team members, provide feedback, and continuously improve as a professional.
Learn new concepts and technologies.
Design, develop, document, analyze, create, test, or modify computer or cloud-based systems or programs.

Requirements

What you’ll need

5+ years of web development experience with Ruby/Rails.
5+ years of experience with SQL databases.
Strong knowledge of object-oriented programming, automated software testing, development, and testing essential methodologies.
Knowledge of GraphQL and Kafka is preferred but not required.
Knowledge of JavaScript/TypeScript, Node.js, and React is a plus.
Ability to consider multiple quality dimensions like user impact, failure tolerance, code maintenance, implementation time, security breaches, and performance.
Be genuinely interested in technology and love to try new things.
Tackle complex problems by considering multiple solutions, weighing them, and deciding on the best course of action.
Must have outstanding written and verbal communication skills.
Thrive on providing and receiving transparent but always constructive feedback.
Ability to work in a fast-paced, rapidly growing company and handle a wide variety of challenges, deadlines, and a diverse array of contacts.
You must be a world-class individual contributor to thrive at Toptal. You will not be here just to tell other people what to do.

Benefits

Comp & perks

🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account Toptal Website LinkedIn All Job Openings 1001 - 5000 employees Founded 2010 🤝 B2B 🎯 Recruiter 🏪 Marketplace 💰 Seed Round on 2012-06 B2B
Recruitment
Marketplace Toptal is an exclusive network of the top freelance software developers, designers, marketing experts, finance experts, product managers, and project managers in the world. The company provides businesses with access to highly skilled professionals to tackle their most important projects. Toptal's offerings allow companies to quickly and flexibly hire top talent for various roles, including developers, designers, and finance experts, among others. These professionals are rigorously tested and vetted to ensure high quality and an excellent trial-to-hire success rate of 98%. With a global presence and a focus on embracing advanced skills such as blockchain and AI, Toptal is leading the future of on-demand work. Companies rely on Toptal for high-skilled freelance talent across various sectors, ensuring they can build amazing teams rapidly and efficiently as per their project needs. Senior Backend Engineer 🔥 2 minutes ago 🇪🇸 Spain – Remote ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Cloud GraphQL JavaScript Kafka Node.js React Ruby Ruby on Rails SQL TypeScript Apply Now Find Hiring Managers Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
Write elegant, efficient, and testable Ruby (and/or TypeScript) code that is easy to maintain and debug.
Cover code with tests and perform manual testing of features, while reviewing the work of colleagues.
Work on the infrastructure part of the project, collaborating with Infrastructure Engineers.
As a true teammate, continuously improve the team’s processes, brainstorm ideas, communicate statuses, and progress.
Mentor team members, provide feedback, and continuously improve as a professional.
Learn new concepts and technologies.
Design, develop, document, analyze, create, test, or modify computer or cloud-based systems or programs. 🎯 Requirements
5+ years of web development experience with Ruby/Rails.
5+ years of experience with SQL databases.
Strong knowledge of object-oriented programming, automated software testing, development, and testing essential methodologies.
Knowledge of GraphQL and Kafka is preferred but not required.
Knowledge of JavaScript/TypeScript, Node.js, and React is a plus.
Ability to consider multiple quality dimensions like user impact, failure tolerance, code maintenance, implementation time, security breaches, and performance.
Be genuinely interested in technology and love to try new things.
Tackle complex problems by considering multiple solutions, weighing them, and deciding on the best course of action.
Must have outstanding written and verbal communication skills.
Thrive on providing and receiving transparent but always constructive feedback.
Ability to work in a fast-paced, rapidly growing company and handle a wide variety of challenges, deadlines, and a diverse array of contacts.
You must be a world-class individual contributor to thrive at Toptal. You will not be here just to tell other people what to do. Apply Now 📊 Check your resume score for this job Improve your chances of getting an interview by checking your resume score before you apply. Check Resume Score Similar Jobs Senior Java Backend Developer 🔥 6 hours ago NEORIS 1001 - 5000 ☁️ SaaS 🏢 Enterprise 🤖 Artificial Intelligence Website LinkedIn All Job Openings Senior Java Backend Developer at NEORIS, working on greenfield project construction and API development. Collaborating on technical standards and system solutions with a multidisciplinary team. 🇪🇸 Spain – Remote ⏰ Full Time 🟠 Senior 🔙 Backend Engineer 🗣️🇪🇸 Spanish Required Java Jenkins Spring Spring Boot SpringBoot Senior Back End Developer, Golang, Python 🔥 8 hours ago Bonapolia 11 - 50 🎯 Recruiter 🤝 B2B Website LinkedIn All Job Openings Backend Engineer designing scalable and reliable backend solutions for mobility platform. Collaborating on system architecture and mentoring engineers in best practices. 🇪🇸 Spain – Remote ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Cloud Docker Kubernetes Microservices Python SQL Go Senior Java Developer – Transición a Tech Lead 🔥 10 hours ago knowmad mood 1001 - 5000 🤝 B2B 🏢 Enterprise Website LinkedIn All Job Openings Join knowmad mood as a Senior Java Developer (transitioning to Tech Lead) responsible for backend development in Java. Collaborate to improve code quality, stability, and provide technical leadership in a flexible remote environment. 🇪🇸 Spain – Remote ⏰ Full Time 🟠 Senior 🔙 Backend Engineer 🗣️🇪🇸 Spanish Required Java Spring Ingeniero/a Software, Java 🔥 10 hours ago knowmad mood 1001 - 5000 🤝 B2B 🏢 Enterprise Website LinkedIn All Job Openings Software Engineer developing Java solutions in a leading digital transformation company. Collaborating on innovative projects and ensuring quality in applications through best practices. 🇪🇸 Spain – Remote ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer 🗣️🇪🇸 Spanish Required Docker Java Kubernetes NoSQL SQL Arquitecto/a Backend, Java 🕒 Yesterday knowmad mood 1001 - 5000 🤝 B2B 🏢 Enterprise Website LinkedIn All Job Openings Backend Java Architect role focused on providing technical guidance and innovation to major clients in digital transformation initiatives. Join a leading Spanish tech firm supporting 500+ clients since 1994. 🇪🇸 Spain – Remote ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer 🗣️🇪🇸 Spanish Required Grafana Java Kafka Spring View More Backend Engineer Jobs 🌐 Worldwide Built by Lior Neu-ner. I'd love to hear your feedback — Get in touch via DM or support@remoterocketship.com Search Search Jobs by country Search jobs by city Search jobs by job title Search entry-level jobs Search junior-level jobs Search senior-level jobs Search jobs by tech stack Search jobs by contract type Search remote internships Search remote part-time jobs Remote jobs Anywhere in the World Companies Hiring Anywhere in the World Companies Hiring Sales People Anywhere in the World Companies Hiring Software Engineers Anywhere in the World Resources Advice Tips for finding remote jobs Interview questions and answers Resume examples Cover letter examples Post a job Affiliates Privacy policy Terms of service Job board SEO course AI Apply Copilot OpenClaw job finder Jobs by Country Remote jobs anywhere in the world (Worldwide remote jobs) Remote jobs United States Remote jobs Australia Remote jobs Brazil Remote jobs Canada Remote jobs France Remote jobs Ireland Remote jobs Germany Remote jobs Netherlands Remote jobs Spain Remote jobs UK Popular Jobs Remote data analyst jobs Remote customer support jobs Remote executive assistant jobs Remote marketing jobs Remote product designer jobs Remote product manager jobs Remote project manager jobs Remote recruiter jobs Remote sales jobs Remote software engineer jobs Jobs by Type Remote full-time jobs Remote part-time jobs Remote contract jobs Remote internship jobs Remote entry-level jobs Remote jobs with no experience required Remote junior jobs (1-3 years of experience) Digital nomad jobs Remote jobs with no degree required Freelance remote jobs Temporary remote jobs Remote jobs hiring now Stay at home mom jobs

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

RubyTypeScriptSQLobject-oriented programmingautomated software testingGraphQLKafkaJavaScriptNode.jsReact

Soft Skills

communicationmentoringteam collaborationproblem-solvingfeedbackadaptabilityprocess improvementtransparencytime managementcritical thinking