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Barcelona, ES
Mid Backend Engineer (Python or NodeJS) | €35K - €50K
Joppy · Barcelona, ES
. Javascript Java Python TSQL NoSQL Docker Elasticsearch Office
We're looking for a skilled Mid-Level Data Engineer for one of our clients (TOP Startup) to design, build, and optimize data pipelines and backend services that ensure clean, reliable data across the organization.
As a Mid-Level Backend Engineer on our Tech Team, you will design, build, and optimize the data pipelines and backend services that keep clean, reliable data flowing across the entire organization. You will own the full lifecycle of data ingestion and transformation work — from understanding a business requirement through to production deployment — and directly shape the backend infrastructure that powers our data-driven decision-making at Flanks.
What you'll do 🛠️
- Design, develop, and maintain scalable ETL/ELT pipelines to ingest, transform, and load data from multiple disparate sources into our core systems.
- Write clean, efficient Python code with a strong focus on performance — applying optimal data structures and algorithms to handle high-volume datasets reliably.
- Collaborate on database schema design (SQL and NoSQL) and own query performance optimization to ensure fast, accurate data access.
- Implement unit tests, integration tests, and data quality checks to guarantee pipeline integrity and catch issues before they reach production.
- Deploy and iterate on pipelines using CI/CD practices and containerization tools such as Docker, participating actively in code reviews to uphold team standards.
What we'd love to see 😍
- Strong Python and/or JavaScript/NodeJS engineering skills with a focus on performance, memory efficiency, and writing maintainable, production-grade code.
- Solid experience building and operating data pipelines — ETL/ELT patterns, pipeline orchestration, and handling large-scale data ingestion — or experience building backend services for a product, ideally with exposure to Elasticsearch.
- Familiarity with both SQL and NoSQL databases, including schema design and query optimization.
- Comfort working autonomously — able to take a high-level requirement, define scope, and drive it to production without heavy hand-holding.
- Ability to navigate unfamiliar codebases quickly and contribute meaningfully from an early stage.
- Experience with CI/CD workflows and containerization (Docker or similar).
- Willingness to understand the financial data we work with and the formulas you will be responsible for implementing. It is important to be curious and open to learning how financial markets work, as this context is essential to correctly ingest, process, and expose financial data.
- Language Proficiency: Professional proficiency in both English and Spanish to collaborate effectively in our bilingual environment 🗣️.
🤗 We offer
- Full-time, permanent contract
- Salary range of €35,000–€50,000 gross per year, based on experience
- An office with stunning views of Barcelona
- Flexible working hours and hybrid work options
- Paid day off on your birthday
- Weekly fresh fruit, coffee, and tea
- Friday happy hours (optional)
- Team-building events
- Health insurance and flexible compensation
- Subsidized digital canteen
- Yearly training budget for continuous growth
About Joppy
Joppy is a technology recruitment platform built for developers by developers.
✅ No CV is required. Just say what you know and what you want.
✅ Anonymous profile by default.
✅ You choose who can talk to you. Companies cannot write to you until you accept their offer.
✅ Only relevant offers that match your preferences. No more Javascript offers for Java developers.
✅ Get rewarded if you get hired.
Keep an eye on tech job opportunities anonymously and find the job that makes you happy.
Senior Java Software Engineer
11 oct.Fever
Barcelona, ES
Senior Java Software Engineer
Fever · Barcelona, ES
. Java Agile TSQL NoSQL Jenkins Cloud Coumputing Elasticsearch Git REST Spring RabbitMQ Office
Hey there!
We’re Fever, the world’s leading tech platform for culture and live entertainment.
Our mission? To democratize access to culture and entertainment. With our proprietary cutting-edge technology and data-driven approach, we’re revolutionizing the way people engage with live entertainment.
Every month, our platform inspires over 300 million people in +55 countries (and counting) to discover unforgettable experiences while also empowering event creators with our data and technology, helping them scale, innovate, and enhance their events to reach new audiences.
Our results? We’ve teamed up with major industry leaders like Netflix, F.C. Barcelona, and Primavera Sound, presented international award-winning experiences, and are backed by several leading global investors! Impressive, right?
To achieve our mission, we are looking for bar-raisers with a hands-on mindset who are eager to help shape the future of entertainment!
Ready to be part of the experience?
Now, let’s discuss this role and what you will do to help achieve Fever’s mission.
About The Role
Location: Spain
What are we looking for:
We are looking for a Java Backend Engineer to join the engineering team with outstanding software development talent proven by great work results/experience. Somebody that cares about code quality and not just get things done, but get things done right.
If you're smart, have great energy, can't think about a system without a CI/CD pipeline and you want to thrive in a fast paced environment, we are in sync.
What would you do at Fever?
During your first month at Fever (Onboarding period):
You’ll join a structured onboarding program designed to help you ramp up smoothly. During this period, you will:
- Meet your buddy and team, and get to know Fever’s culture and ways of working.
- Set up your local environment and become familiar with our based stack, CI/CD pipelines, and cloud infrastructure.
- Learn about our architecture and observability tools while contributing small improvements and fixes.
- Have your first code running in production and a clear understanding of our delivery flow and processes.
- By the end of the onboarding, you’ll be ready to join your long-term squad and start contributing to larger initiatives.
You’ll be confidently collaborating and delivering at full speed. You will:
- Design and implement end-to-end features within your squad.
- Participate in architectural discussions and propose improvements across our services and APIs.
- Work with event-driven systems and focus on performance, reliability, and scalability.
- Collaborate closely with Product, Data, and other Engineering teams to enhance our platform and developer experience.
You’ll be fully established as a key contributor in your team. You will:
- Take ownership of core components and help evolve their architecture.
- Lead by example through code reviews, design sessions, and mentoring.
- Contribute to best practices in areas like scalability, observability, and system design.
- Drive continuous improvement and have a visible impact on how we build high-performing services at scale.
- Become an expert of your domain, using business context and technical excellence to drive strategic initiatives forward
Must have skills:
- Strong knowledge on good practices, testing and design patterns
- You are proficient in business English
- You know how to deliver code from development to production
- Experience with RESTful APIs (implementation and consumption)
- Knowledge of relational databases and SQL
- Java (J2EE/ Java 25)
- Spring / Spring Boot frameworks
- REST APIs
- NoSQL databases
- Familiarity with Docker/Kubernetes environments
- Used to working with tools like Git, Jenkins, CI/CD pipeline
- Exposure to Elasticsearch, RabbitMQ or Agile methodologies
- Home office friendly anywhere in Spain
- Flexible schedule
- Opportunity to have a real impact in a high-growth global category leader
- 40% discount on all Fever events and experiences
- Responsibility from day one and professional and personal growth
- Great work environment, international team of talented people to work with!
- Health insurance from Day 1.
- English or Spanish Lessons
- Gympass Membership
- Cobee (tax free allowance on restaurants and transport).
- Possibility to receive in advance part of your salary by Payflow.
Fever aims to provide the best and fastest possible experience to our candidates. This is how it would look like:
- Talent Interview - 1h: An intro to Fever, our culture and a conversation about your background and experience.
- Technical Interview - 2h: A deep dive into your technical expertise through a system design discussion and a short coding exercise, giving you the chance to walk us through your reasoning and problem-solving approach — and ask us anything about your day-to-day at Fever.
- Manager Interview - 1.5h: A conversation about how you communicate context and trade-offs, own outcomes, quantify impact, and think about reliability, scale, and system design decisions.
If you want to learn more about us: Fever's Blog | Tech.Eu |TechCrunch
Fever is committed to creating an inclusive and diverse workspace where everyone's background and ideas count. Our main goal is to find the best possible talent regardless of place of birth, racial or ethnic origin, gender, gender identity, religion, opinion, sexual orientation, disability, pregnancy, marital status, age or caring responsibilities. We encourage everyone to apply!
If you require any kind of accommodation during the selection process please contact our Talent team so we can help you by providing a welcoming and seamless journey.
If you want to know more about how Fever processes your personal data, click here Fever - Candidate Privacy Notice