At Sequoia Connect , we are a Talent-First Technology Ecosystem that redefines how elite professionals interact with the global digital landscape. We move beyond traditional models to act as a catalyst for the top 1% of global talent, connecting human potential with complex industrial execution. By joining our inner circle, you are not simply taking a position; you are aligning with a strategic partner dedicated to updating your "Human OS" and accelerating your growth through world-class, high-impact projects.
We are currently partnering with a global IT powerhouse that represents the connected world through innovative, customer-centric experiences. As a USD 6 billion organization and one of the top 7 IT service providers globally, our client empowers over 1,200 global customers—including several Fortune 500 companies—to "Rise™." With a massive network of 163,000+ professionals across 90 countries, they are at the absolute forefront of digital transformation, leveraging next-generation technologies such as 5G, AI, Blockchain, and Quantum Computing.
This is your chance to thrive in a workplace recognized as one of the most sustainable corporations in the world. You will join an environment that values innovation and societal impact, working on end-to-end digital transformation projects for global leaders. If you are a driven professional looking for integral career opportunities and exposure to high-impact projects within an international network of expertise, this is where you belong.
We are currently searching for a Tandem Developer :
Responsibilities
Design, develop, and maintain backend components on HPE NonStop (Tandem), adhering strictly to change control practices, coding standards, and platform-specific performance considerations (I/O, locking, concurrency).




Analyze and resolve complex defects in legacy systems, performing transaction traceability, fault diagnosis, and corrective adjustments with minimal impact to ensure data integrity and operational continuity.
Implement and maintain integrations with external systems using available NonStop mechanisms (services, flat files, message queues, TCP/IP sockets, processes), guaranteeing data validation, error handling, and traceability.
Query, tune, and adjust NonStop databases (SQL/MP, SQL/MX, Enscribe), optimizing queries, structures, and access paths to maintain optimal response times and stability under heavy transactional loads.
Document transaction flows, business rules, integration contracts, and operating procedures.
Collaborate effectively with modern engineering teams (e.g., Java/Kafka environments) to map core system data and business rules into canonical models for enterprise-wide use.
Automate repetitive operational and maintenance tasks using scripting and standard utilities within the NonStop ecosystem.
Requirements
Design, develop, and maintain backend components on HPE NonStop (Tandem), adhering strictly to change control practices, coding standards, and platform-specific performance considerations (I/O, locking, concurrency).
Banking Sector Experience: 3+ years of experience working within the banking or financial services industry, understanding its rigorous standards for security and transactional integrity.




Analyze and resolve complex defects in legacy systems, performing transaction traceability, fault diagnosis, and corrective adjustments with minimal impact to ensure data integrity and operational continuity.
Implement and maintain integrations with external systems using available NonStop mechanisms (services, flat files, message queues, TCP/IP sockets, processes), guaranteeing data validation, error handling, and traceability.
Query, tune, and adjust NonStop databases (SQL/MP, SQL/MX, Enscribe), optimizing queries, structures, and access paths to maintain optimal response times and stability under heavy transactional loads.
Document transaction flows, business rules, integration contracts, and operating procedures.
Collaborate effectively with modern engineering teams (e.g., Java/Kafka environments) to map core system data and business rules into canonical models for enterprise-wide use.
Automate repetitive operational and maintenance tasks using scripting and standard utilities within the NonStop ecosystem.
Desired
Experience collaborating on modernization projects (e.g., bridging legacy Tandem systems with modern Java/Kafka event-driven architectures).
Familiarity with cloud-native foundations or AI coding assistants.
Languages
Advanced Oral English.
Advanced Spanish.
Note:
Hybrid

If you meet these qualifications and are pursuing new challenges, start your application on our website to join an award-winning employer. Explore all our job openings | Sequoia Career’s Page : https://www.sequoia-connect.com/careers/

Keywords:
Tandem NonStop, HP NonStop, Guardian, OSS, Pathway, COBOL, TAL, Java SE, SQL/MP, SQL/MX, SOAP, REST, Serverclass, Webgate, Banking, Legacy Modernization.
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📌 Tandem Developer (Ciudad de México)
🏢 Sequoia Connect
📍 Ciudad de México