Senior Backend | Data Engineer
3pillar · México, Mexico ·
- Work mode
- Remote
- Seniority
- Senior
- Employment
- Contract
- Category
- Data engineering
- Experience
- 5+ years
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Senior Backend/Data Engineer at 3Pillar architecting the backend and data foundation for multi-tenant AI-driven platforms: designing PostgreSQL schemas with row-level security, building async Python (FastAPI/Pydantic) services, orchestrating data pipelines, and writing OpenAPI contracts in a contract-first, remote-first services environment.
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
Design and implement advanced PostgreSQL schemas with row-level security (RLS) for multi-tenant applications.
Build and maintain async-heavy backend services using Python frameworks (e.g., FastAPI) with Pydantic validation.
Architect scalable data pipelines and orchestrate complex multi-stage data processing workflows.
Implement and enforce data isolation patterns in shared database environments.
Design and manage complex data workflows (e.g., additive data changes, diff detection, and selective re-processing).
Write and maintain OpenAPI contracts that serve as the development spec for cross-functional teams.
Collaborate with AI/LLM Leads on output validation, deterministic data integration, and system reliability.
Cross-functional
Craft code that is performant, testable, scalable, and secure
Provide accurate status tracking, reporting, and estimation
Collaborate with fellow engineers and product leadership to understand requirements
Take ownership from technical design through successful delivery
Python 5+ years (primary backend language)
PostgreSQL & database architecture (RLS, multi-tenancy, schema design)
FastAPI or equivalent async Python framework
Experience with data pipeline orchestration, ETL processes, and async processing
5+ years total software engineering experience with hands-on work in both backend and data engineering
Experience in engineering software systems of medium-to-large scope and complexity
Contract-first or API-first development – familiarity with OpenAPI, REST API contracts, or similar
Familiarity with Agile software development methodologies
Proficiency with relational databases and SQL
Proficiency in English
Pydantic & JSON schema validation (for structured backend output)
AWS RDS and managed database services
Multi-tenant SaaS architecture patterns
Docker & containerization
Experience with LLM/AI system integration from a data perspective
AWS IAM and secrets management
Migration tools (Alembic for Python)
Testing strategies for data integrity and security (unit, integration)
Understanding of Software Development Life Cycle (SDLC) and AI SDLC
Knowledge of HTTP protocols and serialization formats (JSON, XML)
Medical Insurance benefits as per company policy.
Life Insurance as per company policy
15 days of paid vacation plus additional days based on tenure
Vacation bonus as per local law
Sick leave and paid holidays as per local law
Profit sharing as per local law
Paternity and maternity leave as per as per local law
Marriage, bereavement and graduation leaves as per company policy
Christmas bonuses as per local law
Work from home allowance as per company policy
Punctuality and attendance bonuses as per company policy
Food tickets as per company policy
Direct deposit of payroll.
Paid professional certifications
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
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