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Principal Full-Stack Developer, Budapest

ION Group

Job Location:

Budapest - Hungary

Monthly Salary: Not provided by the employer

Posted: 19 May 2026 (30+ days ago)

Application Deadline: 15 September 2026

Vacancies: 1 Vacancy

Job Summary

Lab49 is an award-winning specialist consultancy thatcreates bespoke technologyin partnership with the most important companies in finance. We were founded in 2002 to bring Silicon Valley solutions to Wall Streets door. Since then we have worked on successive waves of technological change including distributed computing high-speed automation enterprise UX and digital distribution (for which Lab49 was among the first significant practicesestablishedon Wall Street) DevOpscloudand data science.

Today we are an established partner in financial markets having delivered hundreds of projects for clients including all the worlds tier-one investment banks and many of the largest buy-side firms globally.

Being part of Lab49 means bringing your drive and creativity into an environment where your contributions will make immediate impact. Engineers will work in cross functional teams consulting directly with our clients shaping not only technical solutions to business problems but delivering them into production.

The Principal Full-Stack Developer will play a critical leadership role on a key project for a strategic Lab49 client. Working in a collaborative cross functional project team with direct client-facing interactions you will have an opportunity to lead a team of engineers and build modern digital products.

What youll be doing:

Partnering with our client to lead the design and build of astructured products tradingUIusing modern web development technology and techniques. You willbe responsible formanagingengineeringdeliverables and the relationships with other key contributors to deliver great software.
Design document and plan for the technical implementation and delivery of working software into production.
Act as a hands-on engineer and architect to support ongoing project work. Lead and activelyparticipatein projects serving as a role model for project teams and collaborating with other practices to ensure successful outcomes.
Partner with client counterparts and stakeholders tomaintainand build relationshipsmaintaininga commercial approach. Develop strong relationships with clients as a strategic partner and technical advisor contributing to expanding our footprint and securing follow-on work.

What you should have:

10 years of solid hands-on experience in software engineering
5 yearsof experience withReactand modern front-end state management.
Extensive experience architecting solutions onAWS includingTerraform and Docker.
Proven track record operating effectively insidelarge complex organizations(e.g. Tier-1 Investment Banks or Global Asset Managers).
Deep understanding ofSQLand data persistence strategies at scale.
BS in Computer Science or equivalent experience.

Why Lab49

Lab49 is an established partner for most financial institutions on Wall Street. You will gain exposureintoa variety of environments business domains technologies and people. Your ability to bring drive and creativity to the role will be the keycomponentto success at Lab49. The broad and intense exposure to a variety of challenges accelerates your career growth and Lab49s structure is designed to enable you to learn and grow as an engineer and consultant.

Lab49/ION is committed to maintaining a supportive and inclusive environment for people with diverse backgrounds and experiences. We respect the varied identities abilities cultures and traditions of the individuals who comprise our organization and recognize the value that different backgrounds and points of view bring to our business.

Lab49/ION adheres to an equal employment opportunity policy that prohibits discriminatory practices or harassment against applicants or employees based on any legally impermissible factor.

We may use artificial intelligence (AI) tools to support parts of the hiring process such as reviewing applications analyzing resumes or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed please contact us.

Required Experience:

Staff IC

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