REST API Jobs in Ljubljana.
All active REST API roles based in Ljubljana.
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Join us in building the future of finance.
Our mission is to democratize finance for all. An estimated $124 trillion of assets will be inherited by younger generations in the next two decades. The largest transfer of wealth in human history. If you’re ready to be at the epicenter of this historic cultural and financial shift, keep reading.
About the team & role
Our Core Exchange team is responsible for all trading interfaces — including the Exchange REST API, FIX API, WebSockets, and market data services. The team’s mission is to deliver a best-in-class trading experience for API users, with a relentless focus on latency, reliability, and data correctness.
As a Staff Software Engineer, you will help scale our trading infrastructure to meet the evolving needs of our most sophisticated users. This is a high-impact role for engineers who love low-latency systems, deeply care about precision, and want to directly shape the tools used by active traders worldwide.
What you'll do
- Design and build performant, reliable, and scalable services for our API trading ecosystem.
- Optimize low-latency data flows and trading paths, ensuring correctness under pressure.
- Own and evolve core components of our REST, FIX, and WebSocket APIs.
- Collaborate with product, infrastructure, and frontend teams to deliver seamless API solutions.
- Participate in the team’s on-call rotation, supporting mission-critical systems used by our most active clients.
- Continuously measure, monitor, and improve the trading API experience.
What you bring
- 10+ years of backend engineering experience.
- Proven experience designing high-performance systems with low-latency and high-throughput requirements.
Familiarity with cloud infrastructure, especially AWS services. - Solid database experience: SQL (MySQL) and/or NoSQL (DynamoDB).
- Experience working on or with production-grade trading APIs or high-volume systems.
- Structured thinker with strong communication skills and a customer-first mindset.
Nice to have
- You’ve built or operated your own automated trading bot or trading system.
- Hands-on experience with the FIX protocol and order management systems.
- Knowledge of WebSockets, streaming market data, or real-time API performance tuning.
- Passion for financial markets and an interest in building tools for professional traders.
Click here to learn more about our Total Rewards, which vary by region and entity.
If our mission energizes you and you’re ready to build the future of finance, we look forward to seeing your application.
Robinhood provides equal opportunity for all applicants, offers reasonable accommodations upon request, and complies with applicable equal employment and privacy laws. Inclusion is built into how we hire and work—welcoming different backgrounds, perspectives, and experiences so everyone can do their best. Please review the Privacy Policy for your country of application.
Ready to apply?
Apply to Robinhood
Join us in building the future of finance.
Our mission is to democratize finance for all. An estimated $124 trillion of assets will be inherited by younger generations in the next two decades. The largest transfer of wealth in human history. If you’re ready to be at the epicenter of this historic cultural and financial shift, keep reading.
About the team + role
We are building an elite team, applying frontier technologies to the world’s biggest financial problems. We’re looking for bold thinkers. Sharp problem-solvers. Builders who are motivated to make a meaningful impact. Robinhood isn’t a place for complacency, it’s where ambitious people do the best work of their careers. We’re a high-performing, fast-moving team with ethics at the center of everything we do. Expectations are high, and so are the rewards!
The Core Exchange team is responsible for building and maintaining trading interfaces including REST APIs, FIX APIs, WebSockets, and market data services. The team focuses on delivering fast, reliable, and accurate trading experiences for API users. You will work closely with infrastructure, product, and frontend teams to ensure trading systems meet strict performance and reliability expectations while supporting a global user base.
As a Senior Software Engineer (IC5), you will design and scale systems that power trading infrastructure used by sophisticated clients. You will focus on improving latency, system reliability, and data accuracy across critical trading paths. This role involves working on core API components and optimizing performance under high-throughput conditions, while contributing to system design decisions that directly impact active traders worldwide!
This role is based in our Slovenia office, with in-person attendance expected at least 2 days per week.
At Robinhood, we believe in the power of in-person work to accelerate progress, spark innovation, and strengthen community. Our office experience is intentional, energizing, and designed to fully support high-performing teams.
Applications for this role will be accepted through 6/1/2026.
Requires participation in an on-call rotation to support business needs.
What you’ll do
● Design and build reliable, scalable services that support API-based trading systems
● Improve latency and throughput across trading data flows while maintaining data accuracy
● Own and enhance core components of REST, FIX, and WebSocket APIs
● Collaborate with product, infrastructure, and frontend teams to deliver cohesive API solutions
● Monitor system performance and implement improvements based on measurable system behavior
What you bring
● You have 5+ years of backend engineering experience
● You have experience building high-performance systems with low-latency and high-throughput requirements
● You are familiar with cloud infrastructure, including AWS services
● You have experience working with SQL (e.g., MySQL) and/or NoSQL databases (e.g., DynamoDB)
● You have experience working with production systems that handle high request volumes
What we offer
● Challenging, high-impact work to grow your career
● Performance driven compensation with multipliers for outsized impact, bonus programs, and equity ownership
● Top tier benefits to fuel your work, including supplemental health insurance, ancillary insurance, and mental health support programs
● Lifestyle wallet - a highly flexible employer-paid benefits spending account expenses beyond traditional benefits such as wellness, childcare, learning, and more
● Time off to recharge including company holidays, paid time off, sick time, paid volunteer time off, parental leave, and more!
● Exceptional office experience with catered meals, events, and comfortable workspaces
● Monthly commuter stipend to help offset in-office commuting costs
Click here to learn more about our Total Rewards, which vary by region and entity.
If our mission energizes you and you’re ready to build the future of finance, we look forward to seeing your application.
Robinhood provides equal opportunity for all applicants, offers reasonable accommodations upon request, and complies with applicable equal employment and privacy laws. Inclusion is built into how we hire and work—welcoming different backgrounds, perspectives, and experiences so everyone can do their best. Please review the Privacy Policy for your country of application.
Ready to apply?
Apply to Robinhood
About Teads
Teads is a leading omnichannel advertising platform focused on driving outcomes for brand and performance advertisers across screens. With a focus on meaningful business outcomes for branding and performance objectives, Teads drives value by leveraging predictive AI technology to connect quality media, beautiful brand creative, and context-driven addressability and measurement. Teads is directly partnered with more than 10,000 publishers and 20,000 advertisers globally. The company is headquartered in New York, New York with a global team of around 1,700 people in 30+ countries.
For more information, visit www.teads.com.
Teads is organizing a Software Engineering Summer School where you will learn all areas of backend and frontend development and build a robust system from scratch. We will go through the process of planning the architecture of the system and setting up the development environment, followed by creating a service and running it locally. We will then connect the service to a NoSQL database and an external API, add logging and instrument the application with useful metrics. You will choose what functionality your application will have and implement the necessary business logic. You will write the backend part in Java with the help of the Spring Boot framework, which helps you quickly bootstrap production ready applications.
After that, we will move to the frontend part, where you will use Angular to implement the user interface. At the end you will learn how to build and dockerize your application and how to deploy it to a public cloud. The summer school will consist of many useful talks given by our expert engineers, each of which will be followed by a hands-on workshop, where you will put the new knowledge in practice. It’s a great opportunity if you want a better understanding of what it means to be a full stack engineer and how we do it in the industry.
The whole event will happen on site in our new offices on Dunajska cesta 5 and will be completely FREE of charge (including lunch, coffee, snacks and all activities). But we do expect your full commitment during the one week of the summer school – remember: if you apply, get accepted and don’t show up, you are taking away a seat from someone else who really wanted to attend!
Who will benefit most from attending the Software Engineering Summer School?
Eager individuals who know how to write code (most of the summer school is very hands-on), and have some knowledge on databases and software development in general. For example:
- Final year undergraduate, masters or PhD students at Computer Science or related university programmes.
- Recent graduates from Computer Science or related university courses.
- Professionals in Computer Science jobs who want to learn more about backend and frontend development and working on data-intensive applications.
How much programming / software development experience do you need?
You will learn a lot about full stack development and what it covers during the summer school but it is preferable that you know at least the basics about databases and REST APIs. Good rule of thumb is that if you ever wrote an application with a simple backend and frontend, if you did any studies at a computer science university programme or work as a software engineer, then you’re good.
What is the plan?
A week of interesting and relevant talks on different backend and frontend development topics given by our highly skilled engineers, followed by hands-on workshops where you will implement the presented concepts and end up with a functional application running in production. All this will be accompanied by fun activities and good food.
Timeline
- Registration open: 20. 4. 2026 - 20. 6. 2026
- Selection notification: 26. 6. 2026
- Summer School: 13. 7. 2026 - 17. 7. 2026
#LI-Hybrid
Life at Teads
At Teads, we don’t just offer new roles - we blend creativity, technology, and data to shape the future of media. You’ll work with smart humans, meaningful brands, and cool tools, all while helping redefine how advertising works in a world that demands more transparency, better insights, and smarter strategies.
As a Teadster, you’ll play a critical role in shaping our future success in the region. Here’s why Teads stands out:
- We've merged two open internet category leaders—Outbrain and Teads—to create the ‘new’ Teads, a unified omnichannel platform that drives results from branding to performance across all screens, including CTV, mobile, and web.
- As part of our team, you’ll thrive in a collaborative and forward-thinking environment that fosters innovation, creative problem-solving, and continuous learning.
- Teads is committed to your success, offering the support, tools, and development opportunities you need to excel in your role.
Our company culture is welcoming, dynamic, diverse, global, and built on top performance.
Teads is an equal employment opportunity employer and committed to diversity and inclusion at all stages of recruitment and employment.
Our team is made up of individuals who are approachable, resourceful, passionate, and proactive. We foster a sense of belonging through our Employee Resource Groups – employee-led groups in which we debate topics and drive change: environmental, women empowerment, charitable initiatives to diversity, equity, and inclusion, you’ll be able to share your passions with likeminded people.
Ready to apply?
Apply to Teads