Senior Software Engineer - Data Integration

Role overview Senior Software Engineer - Data Integration

Permanent employee, Full-time

Barcelona

Your Challenge Own the End-to-End Data Pipeline Lifecycle

Build for Scale and Reliability

Solve Complex Data Challenges

Collaborate and Lead

Drive Technical Excellence

You will design, build, and maintain robust and scalable ETL / ELT pipelines to process data from diverse sources, including third-party APIs, databases, message queues, and flat files.

Ensure the highest standards of data quality, integrity, and performance. You will be responsible for the monitoring, security, and operational excellence of our data integration systems.

Implement sophisticated data transformations and business logic to turn raw data into actionable information that drives product features and critical business decisions.

Work closely with product managers, data scientists, and other engineers to define requirements and deliver high-impact data solutions. Mentor junior engineers and champion best practices in data engineering and software development.

Contribute to a high-quality codebase through thoughtful code reviews, comprehensive documentation, and a commitment to continuous improvement. You will keep abreast of new technologies and trends to evolve our data stack.

Must-haves Experience

5+ years in software engineering, with a demonstrated focus on data integration, ETL development, or backend systems.

ETL Expertise

Deep expertise in designing, implementing, and operating complex ETL / ELT pipelines.

Programming Proficiency

Strong coding skills in a modern language. Proficiency in TypeScript is required for this role.

Database Mastery

Strong command of relational databases (e.G., PostgreSQL , MySQL), including data modeling and query optimization.

Cloud & DevOps

Hands-on experience with a major cloud provider ( GCP preferred) and container orchestration using Kubernetes .

Problem Solving

A pragmatic and tenacious approach to solving complex technical problems, with the ability to work effectively both independently and within a team.

Nice-to-have Architectural Vision

Experience with microservices architecture and distributed systems.

Modern DevOps

Knowledge of CI / CD principles and experience building and maintaining automated testing frameworks.

Observability

Familiarity with modern monitoring and logging tools (e.G., Prometheus, Grafana, ELK stack).

Data Orchestration

Experience with workflow orchestration tools like Airflow or Prefect.

API Fluency

Deep understanding of RESTful API design and security standards (OAuth, JWT).

Domain Knowledge

Previous experience in the Energy, FinTech, or another data-intensive industry.

Your Benefits Multicultural & friendly cleantech startup environment

Birthday off — enjoy your special day!

Hybrid & flexible work setup

Free coffee, tea, snacks & fresh organic fruit in the office

Company-sponsored team events twice a year, plus fun after-work activities

Save money with Cobee on meals, transport, and more

Referral bonus program — help us grow the team and get rewarded

Diversity & Inclusion In Flexidao we embrace diversity by having and promoting an inclusive and diverse environment. Therefore, we are committed to equal opportunity employment regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender, or gender identity or expression.

Recruitment Process Google Meet Interview with HR

Google Meet Technical Interview with our CTO and Backend Team Lead

Optional Follow-up Interview with our CTO and Backend Team Lead

Apply now before it’s too late!

We don’t offer just a “job”. It’s about building cool stuff that matters, together with a great team.

If you see yourself working with us and can meet the key requirements, send your CV to join Flexidao to

About us Flexidao is a clean energy portfolio management platform designed for corporate energy and sustainability teams managing complex clean energy portfolios.

Our software-as-a-service solution aggregates and standardizes volume and contract data on electricity consumption, production, and energy attribute certificates by integrating with data hubs, registries, and third-party providers.

Flexidao is headquartered in Amsterdam and Barcelona, but it has operations globally. Its broad geographical reach enables a complete view of an organization’s portfolio of clean energy contracts, equipping teams with tools for digitizing and automating crucial workflows, monitoring operational and compliance risks, and evaluating advanced procurement strategies.

Our mission is to improve the return on investment of clean energy procurement, significantly reduce manual workload, enhance internal oversight and strategic insight, and ensure timely and confident reporting to stakeholders.

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