Senior Software Engineer (Golang/TypeScript/React) - Independent Contractor

Lever, Inc.; España; A distancia; EUR 50.000 - 64.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Remote work

US ET hours

Ownership over features

Descripción de la vacante

Lever, Inc. is seeking a Senior Software Engineer (Golang/TypeScript/React) for an independent contractor role based in Spain.

You will develop backend Golang microservices and frontend UI with React and TypeScript, delivering scalable, data-intensive features. You will own features end-to-end, influence architecture, and drive improvements in performance, observability, and automation, while collaborating with a distributed team across Product and stakeholders.

Formación

• Experience developing backend services and web apps with Go, deploying services in Docker containers.
• Experience building modern frontend with React/TypeScript, focusing on performance and usability.
• SQL experience with relational databases and data-intensive apps.
• Strong clean-code and idiomatic TS/Go, with engineering standards.
• Ability to learn quickly and communicate with stakeholders.
• Excellent communication and collaboration skills; commitment to learning.
• Go concurrency (goroutines) experience is a plus.
• CI/CD with GitLab is a plus.
• Observability tools like Prometheus and Grafana are advantageous.
• Experience with MaterialUI, Airflow, Python, or Terraform is welcome.

Responsabilidades

• Design, develop, test, maintain, and enhance Golang microservices and frontend applications.
• Build polished, performant React/TypeScript UI components following the design system.
• Take end-to-end ownership of features from ideation to production and improvement.
• Contribute to technical strategy by evaluating architectures and trade-offs.
• Improve performance, reliability, and observability with monitoring and best practices.
• Raise engineering quality through code reviews, automation, and standards.
• Collaborate with engineers, Product Managers, and stakeholders to deliver impactful solutions.

Conocimientos

Golang

TypeScript

React

Docker

SQL

CI/CD

Observability

Communication

Goroutines

AI tooling

Herramientas

GitLab CI

Prometheus

Grafana

MaterialUI

Terraform

AWS

MariaDB

ClickHouse

Docker

SQL

Descripción del empleo

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Engineer (Golang/TypeScript/React) - Independent Contractor based in Spain.

This is a senior engineering opportunity focused on building and evolving a data-intensive platform used by major global organizations and financial institutions.
You will work across backend microservices and modern frontend applications, combining Golang, TypeScript, and React to deliver reliable and performant products.
The role offers meaningful ownership, with engineers expected to take features from initial ideas through production and ongoing improvement.
You will contribute to technical strategy, architectural decisions, engineering standards, and the modernization of existing systems.
The engineering environment emphasizes observability, automation, performance, clean code, and continuous improvement.
You will collaborate within a distributed technical organization while engaging with Product and stakeholders across the wider business.
The position is fully remote and requires working US Eastern Time hours to maintain strong collaboration with the broader team.

Accountabilities:

• Design, develop, test, maintain, and enhance Golang microservices and frontend applications, ensuring they remain reliable, scalable, maintainable, and aligned with product needs.
• Build polished, performant, component-based user interfaces in React and TypeScript, following established design system principles and delivering a strong customer experience.
• Take end-to-end ownership of features, from ideation and technical design through implementation, testing, deployment, and continuous improvement in production.
• Contribute to technical strategy by evaluating architectural options, balancing existing systems with new technologies, and clearly communicating technical decisions and trade-offs.
• Improve the performance, reliability, and observability of services and applications through effective engineering practices and appropriate monitoring solutions.
• Raise engineering quality standards through clean-code practices, thoughtful code reviews, automation, process improvements, and the adoption of technologies that improve team productivity.
• Collaborate closely with engineers, Product Managers, and stakeholders across the business to understand requirements, communicate complex technical topics, and deliver solutions that create meaningful business impact.

Requirements:

• Strong professional experience developing backend services and web applications with Golang, including deploying services in Docker containers.
• Strong experience building modern, componentized frontend applications using React and TypeScript, with a focus on performance, usability, and maintainability.
• Ability to write performant SQL and work effectively with data-intensive applications and relational databases.
• Strong understanding of clean-code principles and idiomatic TypeScript and Go, with the ability to apply these principles during development, code reviews, and engineering standards.
• Ability to quickly understand a new business domain and product, learn independently, and apply that knowledge to technical and product decisions.
• Strong communication skills, including the ability to explain complex technical concepts clearly to both technical and non-technical stakeholders.
• Demonstrated commitment to continuous learning and improving technical skills, engineering practices, and ways of working.
• Experience with concurrent application logic, such as Go goroutines, is beneficial but not essential.
• Experience building CI/CD pipelines, particularly with GitLab CI, is a plus.
• Familiarity with observability tools such as Prometheus and Grafana, as well as experience with AI tools used to improve engineering productivity or productionized AI solutions, is advantageous.
• Additional experience with MaterialUI, Airflow, Python, or Terraform is welcome.
• Experience with technologies such as Golang, TypeScript, React, MaterialUI, MariaDB, ClickHouse, GitLab, AWS, and SQL is valuable.

Benefits:

• Compensation of USD 5,000–6,500 per month as an independent contractor.
• Fully remote working environment with location flexibility.
• US Eastern Time working hours, typically aligned with approximately 2:00 PM–10:00 PM CET or 1:00 PM–9:00 PM BST.
• Opportunity to work on a data-intensive platform serving major international organizations and financial institutions.
• Significant ownership over features, technical decisions, architecture, and engineering improvements.
• Exposure to large-scale financial data collection, processing, validation, analytics, and data-driven products.
• Collaboration within a technical organization of approximately 30 technologists, working in small, cross-functional teams alongside Product Managers and business stakeholders.
• Opportunity to contribute to engineering standards, automation, observability, performance, and adoption of modern technologies including AI-enabled tooling.
• Fully remote collaboration within an international, technology-focused environment.

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