Data Engineer

dojo.; Lisboa; Hybrid; EUR 55,000 - 90,000; Full time

Benefits offered by this job

Equity

Health coverage

Hybrid work in Lisbon

Top equipment

Job summary

DOJO seeks a data platform engineer to own ingestion, transformation, quality, and delivery at scale in Lisbon. You’ll shape the graph-based semantic layer powering AI agents and product features, turning messy signals into reliable data.

You’ll collaborate with the founders, AI engineers, and product teams to accelerate experimentation, enforce data quality standards, and design scalable pipelines. The role offers meaningful equity and a hybrid setup in Lisbon.

Qualifications

• Proven experience building and operating production data infra.
• Experience with data mesh, data vault, data quality, governance.
• Strong Python skills and experience with Dagster, Polars, DuckDB.
• Eye for data quality and scale as an engineering problem.
• CS or Engineering background; exceptional candidates welcome.

Responsibilities

• Own the data platform end-to-end: ingestion, transformation, quality, delivery at scale.
• Build the graph-based semantic layer bridging unstructured signals with structured data.
• Establish and enforce data quality: schema validation and monitoring.
• Work with founders, AI engineers, and product teams for fast feature iteration.
• Close the AI-data loop: keep data fresh for AI systems and models.
• Help shape engineering culture through code reviews and architecture decisions.

Skills

Data pipelines

Python

Data quality

Data mesh

CS background

AI data infra

Streaming

Education

CS/Engineering degree

Tools

Dagster

Polars

DuckDB

Iceberg

Arrow

ClickHouse

Kafka

Job description

About This Role

DOJO’s data layer is our biggest competitive advantage. It’s a strategic platform that powers product features, feeds our AI agents, drives evaluation systems, and gives customers insights no other tool can. It sits at the center of everything we build.

You’ll own the data infrastructure that makes this work: ingestion from thousands of heterogeneous sources, transformation, quality, and delivery at scale. Synthesizing noisy, unstructured marketing data into structured intelligence that grounds our AI agents - your work directly shapes the quality of our product and the trust our customers place in us.

Experience Levels

We don’t do hierarchy - everyone builds, everyone ships, everyone has a voice. What changes with experience is the surface area you take on and the complexity of the calls you’re ready to make.

• A few years in (mid-level) - You’re building pipelines and quality systems, growing into platform ownership, and learning from engineers who’ve built data infrastructure at scale.
• Deep experience (senior-level) - You own the data platform. You make infrastructure decisions and set the quality standards that keep the product trustworthy.
• Been doing this a long time (staff/principal-level) - You define the data architecture and technical vision. You shape how data powers every product capability and AI system.

What You’ll Do

• Own the data platform end-to-end - ingestion from diverse sources, transformation, quality assurance, and delivery at scale, making deliberate infrastructure choices that compound over time
• Build and maintain the graph-based semantic layer that bridges unstructured marketing signals with structured, queryable data that is continuously enriched and updated
• Establish and enforce data quality standards - schema validation, anomaly detection, and monitoring that catches problems before customers do
• Work directly with the founders, AI engineers, and product teams to ensure the data layer enables fast iteration on new features and agent capabilities
• Close the AI-data loop - keep data fresh and accurate so our agents learn from the best signals, and use AI at the core of the data infrastructure itself
• Help shape our engineering culture and raise the bar as the team grows - through code review, architectural decisions, and how we work together

You May Be a Good Fit If You Have

• Strong experience building and operating production data infrastructure - pipelines, storage, quality systems, and the tooling around them
• Experience with modern data engineering patterns - data mesh, data vault, data quality, and data governance - not classic ETL and BI warehouse architectures
• Strong proficiency in Python and modern data tools (e.g. Dagster, Polars, DuckDB, Apache Iceberg, Apache Arrow, ClickHouse, Kafka)
• An eye for data quality and scale as a first-class engineering problem, not an afterthought
• Strong foundations in CS or Engineering, though exceptional candidates with alternative backgrounds are welcome
• Experience with data infrastructure for AI systems - evaluation pipelines, data flywheels, or MLOps - is a strong plus
• Experience with streaming architectures and real-time data pipelines is a plus

The DOJO Way

We love what we build and who we build it with. Low ego, high trust, and a winning spirit - we believe in each other, push each other, and have a lot of fun doing it together. These are the values we live by:

• Ownership - It’s your dojo. The company is yours too. We hire people, not job descriptions - and we expect you to go where you’re needed. We own our mistakes, we relish feedback, and we build and ship rather than plan and talk.
• Drive - Do the work. We choose the harder path when it’s the right one and do the unglamorous work that actually moves the needle, rather than focusing on flash and vanity outcomes. Persistence over shortcuts, dedication over comfort.
• Honesty - No spin. We say the hard thing early. We’re straight with our teammates, our customers, and ourselves - and we always strive to find the hard truth behind the easy answers.
• Excellence - Raise the bar. The best work lives at the intersection of deep technology and deep human understanding. We care about the whole, not just our corner - from the smallest detail to the biggest challenge.
• Simplicity - Make the simple easy and the complex possible. We reduce complexity to increase impact. We build a product that doesn’t need training or consulting - it just works. When in doubt, take it out.
• First Principles - From the ground up. We challenge the status quo. We strip things to essentials and redesign from the ground up. We choose principles and systems that compound over quick fixes and band-aids.

What We Offer

Meaningful early-stage equity, zero bureaucracy, and the kind of impact you only get before everyone else shows up. Competitive salary, comprehensive health coverage, hybrid work in Lisbon with flexible hours, and top-of-the-line equipment.