Senior Software Engineer (Full Stack)

3Pillar is an AI transformation partner on a mission to help enterprises build the AI-native products and intelligent agents that will define the next era of business. With teams across North America, Europe, Latin America, and Asia, we work with the most ambitious companies in financial services, healthcare, media, and technology — helping them move faster, modernize boldly, and compete on their own terms. Our HelixAI platform and Helix Pods delivery model put our engineers at the center of real agentic transformation — doing work that is open, portable, and built to last. We are building the future of enterprise AI

• Facilitate effective communication with client project stakeholders regarding project status and recommendations.

• Craft client code that is not just efficient, but also performant, testable, scalable, secure, and of the highest quality.

• Actively participate in accurate planning and estimation efforts, utilizing project methods and tools.

• Proficiently gather requirements and organize/present developed features for clients.

• Execute complex activities within the current methodology and quality standards, showcasing success across diverse engagements.

• Promote client success across the team by collaborating with engineers, designers, and managers to understand user pain points, anticipate potential problems, and iterate on solutions that drive client success.

• Engage in agile software development, including daily stand-ups, sprint planning, team retrospectives, and other governance activities.

• Actively participate in the Engineering Practice community, mentoring others through Communities of Practice (CoPs) or on project teams, and supporting the growth of technical capabilities.

• Independently drive project delivery within defined architecture, demonstrating autonomy and accountability in all stages from conceptualization to deployment.

• Core Feature Engineering: Develop critical functional logic across platform components, including global identity management, cross-system profile sync configurations, and conditional event state machines for multi-variant tournament bracket processing.

• High-Performance Client Architectures: Build out client-side data persistence layers and sync semantics for native iOS (Swift/SwiftUI) or Android (Kotlin/Compose) structures, ensuring a sub-2-second cold launch target and reliable local reads under zero-connectivity field conditions.

• Cryptographic Data Protections: Implement field-level encryption protocols using AWS KMS customer-managed keys on sensitive user attributes, specifically enclosing minor-athlete medical, dietary, and safeguarding-restricted parameters.

• Advanced Integration Adapters: Construct third-party integration adapters running at a non-accelerated baseline factor, connecting messaging transports (WhatsApp Business API fan-out), profile systems of record, and peer-to-peer payment gateway handoffs.

• Automated Verification Feeds: Write comprehensive unit, integration, and contract test fixtures to feed the automated evaluation harness, ensuring that features cleanly handle complex boundary conditions.

• Technical Mentorship & Governance: Perform exhaustive code reviews at assigned trust tiers and provide active mentorship to software engineers regarding modular decoupling, defensive coding, and domain safety.

• A minimum of 5+ years of experience/expertise in the following areas specified below*:

  • Expertise in NodeJs(primary), React, React Native, mobile app experience, Docker, Postgres

  • Proven experience in developing microservices and local environment setup

  • Proven track record of Design, development and implementation of React UI/.Net based large volume, high availability enterprise applications

  • Experience on exception handling, correct use of data structures, multi-threaded programming, memory management and application tuning

  • Strong NodeJs (Typescript, Express Framework, type-orm, class-validator) based microservices development

  • Must have excellent exposure in Unit Testing by jest

  • Good knowledge in design patterns

  • Good hands on experience with RDBMS like Oracle/ SQLServer & have ability to write data structures, basic SQL Queries & knowledge of joins, Views, Group By, Having Clause etc

  • Excellent oral/written communication and interpersonal skills with ability to multitask and work under pressure to meet deadlines

  • Experience in Agile software development methodologies.

  • Expertise in applying Object-Oriented Programming principles (abstraction, encapsulation).

  • High-level design proficiency following UML / C4 / ArchiMate.

  • Experience in creating and implementing well-tested, scalable, and performant enterprise-level systems.

  • Practice and initiative mentoring other engineers and decision-makers throughout the organization.

  • Good understanding of SOLID principles.

  • Familiarity with OWASP.

  • Proficiency in the English language.

  Additional Experience Desired:

  • Object-Relational Mappers (ORMs)

  • Architectural (Microservices, Serverless etc) and Design (Factory, Singleton, Observer etc) Patterns

  • Unit Testing

  • Working in the Cloud

  • Containers using Docker/Kubernetes

  • Specific client-engagement specified technologies, which will be determined and vetted at the time of the interview.

  • Core Architectural Track Focus:

    • For Mobile Focus: Advanced proficiency in native iOS (Swift/SwiftUI) or native Android (Kotlin/Jetpack Compose), local database architectures (SQLite, CoreData, Room), and offline delta-sync patterns against server cursors.

    • For Backend Focus: Advanced proficiency in modular backend engineering, contract-driven REST/BFF API design, data aggregation models, and multi-tenant schema isolation.

    • AWS Environment Fluency: Direct experience provisioning and utilizing AWS resources, including private Amazon S3 media buckets utilizing short-expiry access tokens, parameter stores, and serverless compute executions.

    • Data Tier Mastery: Strong proficiency in SQL and relational database design, with an engineering-level understanding of tenant isolation constraints and row-level data access policies.

    • Experience Parameters: 5+ years of software engineering experience shipping enterprise-grade, multi-tenant web platforms or native consumer mobile applications.

At 3Pillar, we offer a world of opportunity:

• Imagine a flexible work environment – whether it's the office, your home, or a blend of both. From interviews to onboarding, we embody a remote-first approach.

• You will be part of a global team, learning from top talent around the world and across cultures, speaking English everyday. Our global workforce enables our team to leverage global resources to accomplish our work in efficient and effective teams.

• We’re big on your well-being – as a company, we spend a whole trimester in our annual cycle focused on wellbeing. Whether it is taking advantage of fitness offerings, mental health plans (country-dependent), or simply leveraging generous time off, we want all of our team members operating at their best.

• Our professional services model enables us to accelerate career growth and development opportunities - across projects, offerings, and industries.

• We are an equal opportunity employer. It goes without saying that we live by values like Intrinsic Dignity and Open Collaboration to create cutting-edge technology AND reinforce our commitment to diversity - globally and locally.

Join us and be a part of a global tech community! 🌍💼 Check out our Linkedin site and Careers page to learn more about what it’s like to be part of our #oneteam!