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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer | Billing - **Company:** WellHub Inc - **Location:** Houston, TX, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Automation of Tests, Cloud Computing, Cloud Engineering, Software Quality, Databases, Continuous Integration, Relational Databases, Distributed Systems, Amazon DynamoDB, PostgreSQL, Microsoft SQL Server, MySQL, NoSQL, Oracle (Applications), Payment Service Provider, Software Architecture, SQL Databases, Backend, Kotlin, Event Driven Architecture, Kubernetes, Information Technology, Restful APIs, Data Pipelines, Serverless Computing, Microservices - **Published:** August 5, 2026 - **Apply:** https://arc.dev/remote-jobs/j/redirect/p9zn0qdanv ## About the Role * Focus on making things right and better at every opportunity; * Solid experience with RESTful APIs written in: Java/Kotlin + Spring (main stack); * Asynchronous processing and data pipelines; * Software Architecture knowledge: Event driven architectures and Serverless; * Software quality and test automation mindset; * Cloud computing (AWS) and Cloud Native (K8s) experience; * Experience with SQL technology such as PostgreSQL, MySQL, Oracle, SQL Server or any other relational database; * Experience with NoSQL database such as DynamoDB; * Experience with microservices and high volume distributed systems; * Experience using AI agents during daily tasks and development; * Bachelor's degree in computer science or equivalent professional experience. We recognize that individuals approach job applications differently. We strongly encourage all aspiring applicants to go for it, even if they don't match the job description 100%. We welcome your application and will be delighted to explore if you could be a great fit for our team. For this specific role, please note that experience working with Kotlin or Java (Spring), microservices, and distributed systems are mandatory requirements. ## Description We are hiring a Senior Backend Software Engineer in our Billing team in Portugal! This is a Remote - Portugal position, meaning you can work from anywhere within the country. Please note that this role is only open to candidates in Portugal. Responsible for the platform that serves the entire Wellhub business, processing millions of transactions for users and companies around the globe. We work closely with cross functional teams and payment service providers to deliver optimum checkout conversion rates and also efficient account management interactions. We are creating a new architecture and set of systems that will guarantee consistency across multiple areas and services. We are looking for a Senior Software Engineer, with a solid history of quality projects delivered, hands-on technical work, willing to work with a team of ~8 mid-level, senior and staff software engineers working from Brazil and Portugal. YOUR IMPACT * Participate in the development of some of the most critical and challenging services in our ecosystem, seeking to build long-term and sustainable solutions; * Design, develop, test, deploy, maintain and improve services focusing on performance, scalability, and resilience; * Build Integration with 3rd party API and tools; * Work in a collaborative and agile environment that prioritizes people over process; * Work with cutting-edge technologies and edge cases on a global scale; * Live the mission: inspire and empower others by genuinely caring for your own wellbeing and your colleagues. Bring wellbeing to the forefront of work, and create a supportive environment where everyone feels comfortable taking care of themselves, taking time off, and finding work-life wellness. ## Related Videos - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [MySQL Protocol Features You Should Be Aware Of](https://www.wearedevelopers.com/videos/100267-mysql-protocol-features-you-should-be-aware-of) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [Why Kotlin is the better Java and how you can start using it](https://www.wearedevelopers.com/videos/661-why-kotlin-is-the-better-java-and-how-you-can-start-using-it) - [Coding for Good: Achieving social change with an app](https://www.wearedevelopers.com/videos/1645-coding-for-good-achieving-social-change-with-an-app) ## Related Articles - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Best Countries for Software Engineers](https://www.wearedevelopers.com/magazine/267-best-countries-for-software-engineers) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london)