WEX · 21 hours ago
Senior Backend Software Development Engineer (Java/Python)
Greater São Paulo Area
Full-time
Onsite
Senior LevelWEX Inc. is a leading and growing global provider of payment processing, information management, and fleet card payment solutions. They are seeking an experienced Senior Backend Software Development Engineer (Java/Python) to join their Platform Modernization group, focusing on designing and delivering complex software solutions while mentoring others and driving technical excellence.
Financial ServicesFinTechPaymentsSoftware
Responsibilities
Design, implement, test, and deploy large-scale software systems with a focus on maintainability, scalability, and performance leading by influence
Demonstrates system-level thinking and technical leadership through influence rather than management
Take end-to-end ownership of stories, regularly delivering complex features and suggesting better implementation paths operating as a senior-level individual contributor with minimal guidance
Consistently write thorough unit, integration, and UI tests; drive test-first approaches and coach others on quality practices
Actively contribute to grooming by asking insightful testability and edge-case questions that improve story quality
Conduct thoughtful design and code reviews, providing meaningful feedback on functionality, architecture, and test coverage
Mentor less-experienced engineers, raising the team’s technical bar through coaching and sharing best practices and improving code quality, testing, and delivery practices
Participate in system design and architecture discussions, influencing decisions with deep technical insight, contributing actively to design, grooming, and review discussions, shaping both features and engineering culture
Proactively identify opportunities for automation, refactoring, and improvement to enhance developer productivity and system reliability
Contribute to a culture of collaboration, transparency, and continuous learning across distributed teams in the US and Brazil
Qualification
Required
Advanced English communication skills
Bachelor's degree in Computer Engineering, Electrical Engineering, Computer Information Systems, Management Information Systems, or a related field
Master's degree
Proven senior professional software engineering experience
Proven expertise in one or more modern programming languages such as Java, Python, C#, or C++
Strong knowledge of data structures, algorithms, and system design principles
Experience building distributed systems, microservices, and RESTful APIs
Demonstrated ability to apply a QA mindset: test-first development, edge-case thinking, and driving quality proactively
Comfortable working across the full stack (front-end, back-end, data, cloud)
Track record of mentoring peers and improving engineering practices
Ability to operate independently and confidently while collaborating effectively in agile teams
Preferred
Experience with Cloud Computing platforms (particularly AWS)
Hands-on experience with containerization (Docker, Kubernetes) and CI/CD pipelines
Strong technical fundamentals in Linux, networking, and operating systems
Experience with relational and non-relational databases, including schema design and performance tuning
Familiarity with observability tools (logging, metrics, tracing) to ensure system reliability
Bias toward data-driven decision-making and using metrics to guide improvements
Company
WEX
Wex is a financial technology service provider for fleet, travel and healthcare industries.
Founded in 1983
5001-10000 employees
H1B Sponsorship
WEX has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (22)
2024 (10)
2023 (12)
2022 (20)
2021 (14)
2020 (18)
Funding
Current Stage
Public CompanyTotal Funding
$900MKey Investors
Warburg Pincus
2025-02-25Post Ipo Debt· $500M
2020-06-30Post Ipo Equity· $90M
2020-06-30Post Ipo Debt· $310M
Leadership Team
Melissa Smith
Chair and Chief Executive Officer
Sachin Dhawan
Chief Technology Officer
Recent News
2026-01-03
2025-12-05
2025-12-02
Company data provided by crunchbase