Salary not listedPosted 4w ago
Real job — pulled straight from ION’s careers page · Verified July 18, 2026 · No reposts.
Job description
ION is hiring a Principal Full-Stack Developer — a full-time, based in Budapest role. Apply directly on ION's careers page below.
Principal Full-Stack Developer, Budapest
Team: Software Engineering
Location: Budapest
Commitment: Full-time
Workplace Type: hybrid
Lab49 is an award-winning specialist consultancy that creates bespoke technology in partnership with the most important companies in finance. We were founded in 2002 to bring Silicon Valley solutions to Wall Street’s 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 practices established on Wall Street), DevOps, cloud and data science.
Today, we are an established partner in financial markets, having delivered hundreds of projects for clients including all the world’s 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 you’ll be doing:
- Partnering with our client to lead the design and build of a structured products trading UI using modern web development technology and techniques. You will be responsible for managing engineering deliverables, 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 actively participate in projects, serving as a role model for project teams and collaborating with other practices to ensure successful outcomes.
- Partner with client counterparts and stakeholders to maintain and build relationships, maintaining a 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+ years of experience with React and modern front-end state management.
- Extensive experience architecting solutions on AWS, including Terraform and Docker.
- Proven track record operating effectively inside large, complex organizations (e.g., Tier-1 Investment Banks or Global Asset Managers).
- Deep understanding of SQL and 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 exposure into a variety of environments, business domains, technologies, and people. Your ability to bring drive and creativity to the role will be the key component to success at Lab49. The broad and intense exposure to a variety of challenges accelerates your career growth, and Lab49’s 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.
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Frequently asked questions
What skills are required for Principal Full-Stack Developer at ION?
The required skills for Principal Full-Stack Developer at ION include: React, AWS, Terraform, Docker, SQL.
What is the seniority level for Principal Full-Stack Developer at ION?
Principal Full-Stack Developer at ION is a Principal level position.
How do I apply for Principal Full-Stack Developer at ION?
You can view the full description and apply for Principal Full-Stack Developer at ION on EchoJobs: https://echojobs.io/job/ion-principal-full-stack-developer-budapest-2xehd.