Senior Automation Developer (OutSystems)

Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!

We are looking for an experienced Senior Automation Developer (OutSystems) to design, develop, integrate, and technically lead enterprise-grade applications and workflow automation solutions.

The role requires strong hands-on OutSystems expertise combined with solid knowledge of application architecture, APIs, databases, enterprise integrations, cloud technologies, and automation platforms. The candidate is expected to take technical ownership of delivered solutions, support less experienced developers, and contribute to architecture and development standards.

What You Will Do:
● Design, develop, test, deploy, and maintain complex enterprise applications using OutSystems.

● Take technical ownership of OutSystems solutions from design through production support.

● Translate complex business requirements into scalable and maintainable technical solutions.

● Define application architecture, module structure, reusable components, and development standards.

● Develop and consume REST/SOAP APIs and integrate OutSystems with enterprise applications.

● Design data models, business logic, workflows, and integration layers.

● Perform code reviews and ensure compliance with OutSystems development, security, and architecture best practices.

● Troubleshoot complex technical issues and optimize application performance and reliability.

● Support CI/CD, release management, and deployment activities across environments.

● Collaborate with Solution Architects, Integration Architects, Business Analysts, QA, DevOps, and business stakeholders.

● Mentor mid-level developers and provide technical guidance to the development team.

● Identify opportunities for RPA, AI/GenAI, and intelligent automation.

Requirements:
Experience

● 7+ years of professional software development experience.

● 5+ years of strong hands-on OutSystems development experience, preferably in enterprise environments.

● Proven experience delivering complex and business-critical OutSystems applications.

● Experience acting as a Senior Developer, Technical Lead, or technical owner of application components.

● Strong understanding of software architecture, SDLC, Agile/Scrum, and enterprise development standards.

OutSystems

● OutSystems 11 and/or OutSystems Developer Cloud (ODC)

● Service Studio

● Integration Studio

● Reactive Web development

● OutSystems Entities and advanced data modeling

● Server Actions, Client Actions, Timers, Processes, and asynchronous processing

● Reusable modules, components, services, and libraries

● OutSystems application architecture and dependency management

● LifeTime / deployment and application lifecycle management

● Performance optimization and troubleshooting

● Security and role management

Programming & Web Technologies

● JavaScript

● HTML5

● CSS3

● SQL

● JSON

● XML

● Strong understanding of web application architecture and browser/server interactions

API & Integration

● REST APIs

● SOAP Web Services

● OpenAPI / Swagger

● OAuth 2.0

● OpenID Connect

● JWT

● API authentication and authorization

● Webhooks

● Integration with enterprise applications and external databases

● Understanding of synchronous and asynchronous integration patterns

Cloud and Architecture

● Experience working with relational databases, including data modeling, SQL development, query optimization, transactions, indexing, and performance tuning.

● Understanding of software architecture principles, including modular and layered architecture, SOLID principles, clean-code practices, design patterns, reusability, scalability, maintainability, and secure application design.

Development & Quality

● Code reviews

● Debugging and root cause analysis

● Performance tuning

● Unit and integration testing

● API testing

● Postman

● Git / version control concepts

● CI/CD principles

Security

● Authentication and authorization

● Role-Based Access Control

● OAuth 2.0 / OpenID Connect

● Secure API development

● OWASP principles

● Secrets and credentials management

● Data protection and encryption concepts

Leadership & Soft Skills

● Ability to take end-to-end technical ownership.

● Ability to lead technical discussions and propose solution designs.

● Mentoring and knowledge-sharing skills.

● Strong analytical and problem-solving abilities.

● Ability to communicate with both technical and non-technical stakeholders.

● Ability to work independently in complex enterprise environments.

● English proficiency – written and verbal.

Nice to Have

Automation / RPA

● UiPath

Enterprise Integration / EAI

● MuleSoft Anypoint Platform

Certifications

Preferred

● OutSystems Professional Developer certification

or

● OutSystems Associate Developer certification combined with strong senior-level commercial experience

Strong Advantage

● OutSystems Architecture Specialist

● OutSystems Security Specialist

● OutSystems Front-end Developer Specialist

● OutSystems Agentic AI Specialist

● UiPath Certified Professional