Smadex is a cutting-edge ad-tech company, we process more than 2,4 million ad requests per second having to reply in less than 100ms. Every day we generate several TBs of data that need to be processed, analyzed, aggregated, and sent as feedback to all the real-time components. Our tech stack is 100% based on AWS, having more than 600 instances running in 4 regions. We are advocates of the “you build it, you run it” philosophy, at Smadex every developer owns its code from design to production!

We're looking for an enthusiastic Junior Data Engineer who is passionate about data pipelines and excited by high-performance engineering challenges.

🎯 The role
You will join a core engineering team responsible for making complex data available to real-time bidding platforms and machine learning models. You will help build robust data pipelines, deliver high-quality features, and solve complex engineering challenges while developing your skills through knowledge sharing and collaboration.

🎯 Responsibilities
<ul>
<li>Design, develop, and implement data features for machine learning models</li>
<li>Implement complex data ingestion services and other short-cycle engineering tasks</li>
<li>Write clean, efficient, and testable code</li>
<li>Test your work locally and in a staging environment</li>
<li>Monitor deployments and help maintain the stability, reliability, and performance of production systems</li>
<li>Participate in code reviews and contribute to technical and architectural decisions</li>
<li>Collaborate with the team in an agile environment, including planning and progress reporting</li>
<li>Take ownership of the features you build and help operate them in production</li>
</ul>

🛠️ Requirements
<ul>
<li>Bachelor's degree in Computer Science or a related technical field</li>
<li>1–2 years of experience in software engineering or data engineering</li>
<li>Knowledge of SQL</li>
<li>Knowledge of Python or Java</li>
<li>Strong interest in big data, machine learning, and data engineering</li>
<li>Excellent written and spoken English communication skills</li>
</ul>

➕ Nice to have
<ul>
<li>Knowledge of Scala</li>
<li>Experience with key-value stores and in-memory databases, such as Redis or Memcached</li>
<li>Familiarity with cloud environments, particularly AWS</li>
<li>Experience with Airflow workflows</li>
<li>Experience working with big data</li>
<li>Experience with Spark</li>
</ul>

🧰 Technology stack
<ul>
<li>Languages: Python, Scala, Bash</li>
<li>Frameworks: Spark</li>
<li>Databases: MySQL, Redis</li>
<li>Cloud and DevOps: AWS, Jenkins, Docker, Airflow</li>
<li>Tools: Git, Jira, Notion</li>
</ul>

🤗 We offer
<ul>
<li>Opportunity to work in a complex engineering environment and gain valuable experience</li>
<li>Opportunities to make a direct contribution through assigned projects</li>
<li>Compensation package</li>
<li>Flexible working hours</li>
<li>Professional development through a LinkedIn Learning subscription and other training opportunities</li>
<li>Monthly meal voucher allowance through Ticket Restaurant</li>
<li>Monthly gym allowance with a choice between DiR and Wellhub</li>
<li>Regular team events and team-building activities</li>
<li>Access to recreational amenities, including a ping-pong table and arcade machine</li>
</ul>

english

Apache Airflow

Spark

Python

Data Engineering

Cloud Platform

Junior Data Engineer

We're looking for a knowledgeable Mid-Senior Software Engineer who enjoys solving complex technical challenges and building reliable, high-quality software for real-time systems.

👥 The team
Join a collaborative core engineering team of eight experienced engineers responsible for maintaining and evolving a real-time bidding (OpenRTB) auction system. The team values knowledge sharing, autonomy, and continuous professional growth while tackling complex engineering challenges.

🎯 Responsibilities
<ul>
<li>Design, develop, and implement new features for core products using Node.js and Java</li>
<li>Write clean, efficient, and testable code</li>
<li>Test work locally and in a sophisticated staging environment</li>
<li>Monitor deployments and help maintain the stability, reliability, and performance of production systems</li>
<li>Participate in code reviews and contribute to technical and architectural decisions</li>
<li>Collaborate in an agile environment, including planning and progress reporting</li>
<li>Take ownership of work across the core platform following a “you build it, you run it” approach</li>
</ul>

🛠️ Requirements
<ul>
<li>Bachelor’s degree in Computer Science or a related technical field</li>
<li>2–4 years of experience in a software engineering role</li>
<li>Hands-on experience with Java or Node.js</li>
<li>Solid theoretical knowledge of data structures, algorithms, and software design principles</li>
<li>Passion for technology and eagerness to learn and grow professionally</li>
<li>Excellent written and spoken English communication skills</li>
<li>Proficiency with Linux, Git, Docker, and Docker Compose</li>
<li>Experience with testing tools and modern CI/CD frameworks</li>
</ul>

➕ Nice to have
<ul>
<li>Experience with key-value stores and in-memory databases such as Redis or Memcached</li>
<li>Familiarity with cloud environments, particularly AWS</li>
</ul>

🧰 Technology stack
<ul>
<li>Languages: Node.js, Java, Bash, Python</li>
<li>Databases: MySQL</li>
<li>Cloud and DevOps: AWS, Jenkins, Docker</li>
<li>Tools: Git, Jira, Notion</li>
</ul>

🤗 What we offer
<ul>
<li>Work with a highly motivated, dynamic team</li>
<li>Great compensation package</li>
<li>Flexible hours</li>
<li>Monthly meal voucher allowance through Ticket Restaurant</li>
<li>Monthly gym allowance with a choice between DiR and Wellhub</li>
<li>Access to LinkedIn Learning and training opportunities</li>
<li>Monthly TGIF events</li>
<li>Regular team-building events</li>
<li>A friendly, collaborative work environment with talented marketers and engineers from more than 40 countries</li>
</ul>

Unit Testing

Node.JS

Jenkins

Java

Mid-Senior Software Engineer

We're looking for a curious, collaborative Junior Software Engineer who enjoys solving complex technical challenges and building high-quality software.

🎯 The team
Join a core engineering team of eight experienced engineers responsible for maintaining and evolving a real-time bidding (Open-RTB) auction system. The team values knowledge sharing, autonomy, collaboration, and continuous professional growth.

🎯 Responsibilities
<ul>
<li>Design, develop, and implement features for core products using Node.js and Java</li>
<li>Write clean, efficient, testable code</li>
<li>Test your work locally and in a sophisticated staging environment</li>
<li>Monitor deployments and help maintain the stability, reliability, and performance of production systems</li>
<li>Participate in code reviews and contribute to technical and architectural decisions</li>
<li>Collaborate in an agile environment, including planning and progress reporting</li>
<li>Take ownership of tasks and contribute to a “you build it, you run it” engineering culture</li>
<li>Share knowledge and apply your expertise across the team</li>
</ul>

🛠️ Requirements
<ul>
<li>Bachelor’s degree in Computer Science or a related technical field</li>
<li>2–4 years of experience in a software engineering role</li>
<li>Hands-on experience with Java or Node.js</li>
<li>Solid theoretical foundation in data structures, algorithms, and software design principles</li>
<li>Proficiency with Linux, Git, Docker, and Docker Compose</li>
<li>Experience with testing tools and modern CI/CD frameworks</li>
<li>Excellent written and spoken English communication skills</li>
<li>Passion for technology and eagerness to learn and grow professionally</li>
</ul>

➕ Nice to have
<ul>
<li>Experience with key-value stores and in-memory databases such as Redis or Memcached</li>
<li>Familiarity with cloud environments, particularly AWS</li>
</ul>

💻 Technology stack
<ul>
<li>Languages: Node.js, Java, Bash, Python</li>
<li>Databases: MySQL</li>
<li>Cloud and DevOps: AWS, Jenkins, Docker</li>
<li>Tools: Git, Jira, Notion</li>
</ul>

🤗 We offer
<ul>
<li>Competitive compensation package</li>
<li>Work-life balance and flexible hours</li>
<li>Meal vouchers through a monthly Ticket Restaurant allowance</li>
<li>Monthly gym allowance with a choice between DiR and Wellhub</li>
<li>LinkedIn Learning and training opportunities</li>
<li>Monthly TGIF events</li>
<li>Regular team-building events</li>
<li>A friendly, collaborative environment with talented marketers and engineers from more than 40 countries</li>
</ul>

MySQL

DevOps

Junior Software Engineer

Smadex

Football after work 

Young and diversified team

Office

Office 1 

After work

About Joppy

Our Mission

But we met each other in 2015. Two companies after (and too much spam, selection processes and infinite human resources bugs), we decided to build our own project.

Five years later we have succeeded matching companies with tech professionals. We are specialized in talent from Spain, but day by day we receive offers from any global place.

Our community is our strength. Joppy is what it is thanks to them. We have specialists from diverse tech areas: Backend, Frontend, Fullstack, Big Data, QA, DevOps, Product, Mobile…

Founded in 2018

+3.500 tech jobs

+{total_users} Joppyters

Hi Joppyter! We're Nico, David, Felipe and Antonio… and an incredible team with five more members. We are a tech team with more than 15 years of experience that have decoded the perfect recruitment process.

Beyond sales—it's about finding the right solution for you

Give me code and I'll give you back a work of art

If product is a bingo, he always does line

Dr Jekill & Mr Hyde or Dr Designer & Mr Front?

Give me a challenge and I will return talent

Connecting talent and people… without superpowers

Development, talent, product, content... our team comes from different areas but has the same goal: the match.

Our team

Tech talent code and companies code don't need to be opposites

Job offer that really matches 100% with candidate. Candidate 100% interested in a company.

We break the code to give companies as much information as possible but candidates only answer a few questions.

We have been inside and outside tech selection process. We know how the machine works… and we are trying to fix it.

Honesty

Simplicity

Trust

Get the Joppy app on your mobile device to access all features on the go

Joppy Native App

We create a company page for you where you can showcase the most important aspects to attract talent (Employer Branding), including all the job postings you have posted. Every candidate who applies will be displayed on the platform.

Career page

+1,520 startups, scaleups & corporates

Who trust us to attract top talent

You'll have access to a dashboard where you can easily manage both your job postings and the candidates who apply. What does this dashboard include?

: The layout help you to better organize candidates you've filtered or who have progressed in the hiring proces

: Organize and sort candidates according to which step they are in the hiring process

: Take notes of the candidates to not miss relevant information about the interviews, highlights or any other relevant information.

: You can communicate directly with all the candidates who apply through the dashboard with a direct chat.

Dashboard

Frequently Asked Questions

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You will shortly receive an email with your account details so you can start publishing offers!

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The ATS, simplified.

Nothing more, nothing less

Designed to give you exactly what you need to attract, organize and connect with top tech talent.

No unnecessary extras, just a seamless way to manage your tech hiring process with ease.

We only accept offers from:

Joppy ATS

A plan for every company

Pricing

We'll perform a 'lite' evaluation (without using our full potential) to provide an assessment of the candidates applying to your job postings, highlighting the aspects that make them a good fit.

Lite vetting

Find news, tools, trends and more in our techfriendly space. Developer? Recruiter? Curious? All yours.

Latest posts (yes, we have a tech blog too)

Join the companies already using Joppy to connect with the right talent and make hiring faster, easier and more effective.

Ready to hire with Joppy?

Real stories from companies that trust Joppy to improve their hiring process.

Business cases

Performance at Joppy

Business cases - Joppy

Describe the type of profile your are always open to check...

Please,  don't use this for one-time positions

Tell us what type of candidates you are always searching for and we will send you an email every time we interview a candidate that match

Need a custom candidates feed?

Joppy Tech Talent

Every week we pick the 5 top candidates among those who have been active in Joppy, the ones that nobody would miss, and share them with you directly to your email, Whataspp or Telegram.

Once a week you'll get an email with the profile of the top 5 candidates among those who have been active in Joppy

Weekly digest on your email

No one will know you've joined

No spam from Joppy or subscribers

Leave whenever you want

Get the candidates on the privacy-focused messaging app alternative

Subscribers of the channels can not see others subscribers

Don't worry about getting messages from other subscribers

You can leave the channel as fast and easy as you join in: 1 click!

Join our channels

Get the candidates on the most used messaging app in the world

Get top active candidates on your email every week

From different markets, sizes, countries… Joppy is a place where business and techies meet each other, creating good term relationships. From peer to peer.

+1200 companies have already found tech talent using Joppy

Explore technology companies, their teams, tech stacks and active opportunities on Joppy.

Tech companies and jobs

All the information about {name} and their open job positions posted on Joppy.

{name}'s job offers - Joppy

Name

Write us about any questions, doubts or suggestions you have

Contact with Joppy

Your profile in less than two minutes. Just a few questions… and it's done.

Only connect with job offers that match 100% with your aptitudes, expertise and needs.

No unwanted chats. Only companies from offers you have accepted can write to you.

No CV required

Get perfect matches

You decide who can talk to you

We understand your code, the dev code. Zero spam, 100% match. You have the power to choose.

Looking for your next job challenge?

In this report we take a closer look at how developers are incorporating AI into their work. To gain valuable insights and understand their usage patterns, we conducted a survey that gathered responses from 470 developers within our community

Techies & AI

We give you a sneak peek: every week we select the top candidates among those actively seeking employment and send them to you via email, WhatsApp, or Telegram. No spam, and completely anonymous!

Do you want to see top candidates without creating an account?

This report on technology hiring trends for 2024, made in colaborattion with Circular, goes beyond statistics. It captures real-world insights from those actively involved in technology hiring.

Crisis? Trends in Tech Recruitment 2024

We analyze the candidate experience from job setup to selection process, showing how each touchpoint affects hiring success, with practical tips to increase applications and reduce friction.

Candidate Experience Report

Relax, we can solve it. We are here to help you to understand techie code... and Joppy is part of it.

Any doubts?

Talent Platform + employer branding + extra services + dedicated Talent Advocate to help you on a more efficient recruiting process, saving your time and effort.

Customized

Premium service

Access to our platform without any limit: Post offers, match with developers, get vetted & manually evaluated candidates and schedule interviews with them.

Candidate's salary

Talent Platform

Match +50K developers and pay only if you hire.

You pay only if you hire!

Remember

For employers

Only 15% of developers are actively looking for a job. Focus your efforts on tech people that are really interested in working with you.

A deal between the talent and the opportunity

And match with some of our 45,000 candidates

No search required. Complete a few fields and candidates that match with your offer will be able to apply.

An expert has already done an evaluation of your candidates, but the final decision is up to you.

You are one click away to chat with the most interesting candidates. Ask them anything you need to know.

How easy is using Joppy?

1. Define your offer

2. Check candidates

3. Chat with them

Our matching system connects your offer with the right candidates. We have a database of +50K!

We manually screen all candidates before they reach you, and we add our expert opinion about their profiles. Then you can chat with candidates that match with your needs.

We're integrated with most of the ATS. Focus your effort on recruiting and save time on boring processes.

Using Joppy is free. If you don't hire, you don't pay!

Don't search

Match top candidates

ATS integration

Pay if you succeed

You will find some data about the Tech ecosystem mainly focused in Spain (Barcelona & Madrid) and some information about companies who are working remotely.

Tech salaries and ecosystem report

We analyzed the tech market from 2025 through February 2026 and compare what candidates want with what companies offer in terms of salary, work modality, and hard skills.

Tech Market Report

More than 30 pages with data, graphs and highlights on the points on which techies and those in charge of the tech selection process do not agree.

Tech selection process

We're doing something right, and it's not just us saying it; our numbers speak for themselves

30 pages of trends, statistics and data from tech sector experts: web development professionals, IT departments managers and recruiters.

Tech trend Report: predictions for 2023

We are not an agency standing between you and the candidate. We handle the noise, the sourcing, the screening and the activation, so you can focus on the interviews and the final decision. All in days, not months.

We speed up your process. You stay in control.

Tell us who you are looking for and we will show you assessed, available candidates who actually want to talk to you.

Find the person your team needs

Tell us the profile, salary and setup you're looking for.

Post your role and tell us what you need

We match your role against our community and activate the right fits.

We evaluate and activate the ones who match

No middlemen, straight to every interested candidate.

Only talk to people who applied to your offer

How it works

Fresh data to understand where hiring processes break, what tech talent values, and how to design selection journeys that build trust from the first touchpoint.

What tech talent expects from a strong Candidate Experience

Conversations with leaders, founders and tech profiles about hiring, culture, product and the everyday work behind teams that actually perform.

Hear how people building tech teams think

Interesting content

AI + human review

Validated match

With a real intent to move

Only active candidates

Top 20 best candidates

Zero noise, zero random CVs. Only evaluated candidates who chose to apply to your role.

candidates you would want to hire

Stop filtering CVs. Connect only with

You cold-message hundreds of candidates, but almost no one replies because they have no intention of moving.

You post and in 24h you have 200 CVs in your inbox. You have to filter all of them, and less than 3% are an actual match.

Our specialist team and our AI system filter every candidate so you only talk to people who are a match and want to move.

Junior Software Engineer

Job Description

Smadex

Photos

Location