Senior Backend Developer (Python or Kotlin) | Colombia

Who We Are

At MAS Global Consulting, we are a premium digital engineering partner trusted by innovative startups and Fortune 100 companies, delivering high-impact solutions through agile delivery, deep technical expertise, and a strong people-first culture across the Americas.

We build long-term partnerships, not just software. MAS means “more” in Spanish, and that mindset drives our commitment to greater opportunity, inclusion, and impact.

Founded by a Latina engineer from Medellín and headquartered in Tampa, Florida, MAS Global Consulting is a 100% Hispanic and woman-owned company, recognized as a Great Place to Work and one of the Fastest-Growing Companies in the US.

Who You Are

You’re a Senior Backend Software Engineer working on building and evolving backend systems that power card products. You write a significant amount of production code using Kotlin or Python, with high standards for quality, reliability, and maintainability.

You work closely with Product, Analytics, and multiple engineering teams to design systems, build APIs, and contribute to service-oriented and event-driven architectures. This is a hands-on senior role with on-call responsibilities and no people management.

What You’ll Do

• Write backend code using Python or Kotlin, maintaining high standards for quality and reliability.
• Design systems and contribute directly to their implementation.
• Work cross functionally with Product, Analytics, and other engineering teams to help define and execute the Card platform strategy.
• Build APIs and data models within service-oriented and event-driven architectures.
• Extend core decisioning services by building new risk and fraud mitigation features.
• Participate in engineering on-call processes to support system reliability, team growth, and operational efficiency.

What You Bring

• 6+ years of experience as a Senior Backend Software Engineer.
• Strong experience building backend systems using Python or Kotlin.
• Experience working with AWS or other cloud providers.
• Solid understanding of relational database systems and best practices.
• Strong understanding of distributed systems, including how architectural decisions impact performance and maintainability.
• Experience building APIs and backend services at scale.
• Excellent written and verbal communication skills, with strong proficiency in asynchronous communication (technical specs, documentation, wikis, project plans).
• Strong organizational and project management skills, with the ability to surface critical information effectively.
• Passion for working with cross-functional teams including Product, Design, Analytics, and Business teams.
• English proficiency at B2 level or higher.

Nice to Have

• Prior experience with card-related systems such as card processing, transaction processing, money movement, ACH, or platforms like Marqeta, Stripe, or FIS.