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.

Key Responsibilities

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

Minimum Qualifications

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

Additional Experience Desired

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)

Benefits

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

What is it like working for 3Pillar Global?

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.

Join us and be a part of a global tech community! \uD83C\uDF0D\uD83D\uDCBC Check out our Linkedin site and Careers page to learn more about what it’s like to be part of our #oneteam!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.