Senior Backend | Data Engineer

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. 

Senior Backend / Data Engineer

Greetings, future tech savant: 

You will build and architect the complete backend and data foundation for sophisticated, multi-tenant AI-driven platforms. Your focus will be on robust database schema design, multi-tenant architectures, asynchronous API services, and data pipeline orchestration.

Your approach: contract-first backend development. You write the OpenAPI specs as the backend takes shape, ensuring seamless integration with frontend and AI components. You will architect data isolation patterns, design complex data processing workflows, implement pipeline stages, and build the core data infrastructure that allows the system to operate securely end-to-end.

Backend

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  Design and implement advanced PostgreSQL schemas with row-level security (RLS) for multi-tenant applications.

  
  
  
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  Build and maintain async-heavy backend services using Python frameworks (e.g., FastAPI) with Pydantic validation.

  
  
  
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  Architect scalable data pipelines and orchestrate complex multi-stage data processing workflows.

  
  
  
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  Implement and enforce data isolation patterns in shared database environments.

  
  
  
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  Design and manage complex data workflows (e.g., additive data changes, diff detection, and selective re-processing).

  
  
  
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  Write and maintain OpenAPI contracts that serve as the development spec for cross-functional teams.

  
  
  
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  Collaborate with AI/LLM Leads on output validation, deterministic data integration, and system reliability.

  
  
  

Cross-functional

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  Craft code that is performant, testable, scalable, and secure

  
  
  
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  Provide accurate status tracking, reporting, and estimation

  
  
  
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  Collaborate with fellow engineers and product leadership to understand requirements

  
  
  
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  Take ownership from technical design through successful delivery

  
  
  

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  Python 5+ years (primary backend language)

  
  
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    PostgreSQL & database architecture (RLS, multi-tenancy, schema design)

    
    
    
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    FastAPI or equivalent async Python framework

    
    
    
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    Experience with data pipeline orchestration, ETL processes, and async processing

    
    
    
  
  
  

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  5+ years total software engineering experience with hands-on work in both backend and data engineering

  
  
  
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  Experience in engineering software systems of medium-to-large scope and complexity

  
  
  
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  Contract-first or API-first development – familiarity with OpenAPI, REST API contracts, or similar

  
  
  
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  Familiarity with Agile software development methodologies

  
  
  
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  Proficiency with relational databases and SQL

  
  
  
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  Proficiency in English

  
  
  

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  Pydantic & JSON schema validation (for structured backend output)

  
  
  
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  AWS RDS and managed database services

  
  
  
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  Multi-tenant SaaS architecture patterns

  
  
  
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  Docker & containerization

  
  
  
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  Experience with LLM/AI system integration from a data perspective

  
  
  
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  AWS IAM and secrets management

  
  
  
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  Migration tools (Alembic for Python)

  
  
  
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  Testing strategies for data integrity and security (unit, integration)

  
  
  
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  Understanding of Software Development Life Cycle (SDLC) and AI SDLC

  
  
  
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  Knowledge of HTTP protocols and serialization formats (JSON, XML)

  
  
  

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  Medical Insurance benefits as per company policy. 

  
  
  
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  Life Insurance as per company policy

  
  
  
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  15 days of paid vacation plus additional days based on tenure

  
  
  
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  Vacation bonus as per local law

  
  
  
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  Sick