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Fullstack Engineer

Fullstack Engineer

Senior Software Engineer (ID Verification Team)

SEON

Budapestsenior

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Role description

SEON is the command center for fraud prevention and AML compliance, helping thousands of companies worldwide stop fraud, reduce risk and protect revenue. Powered by 900+ real-time, first-party data signals, SEON enriches customer profiles, flags suspicious behavior and streamlines compliance workflows - all from one place. SEON provides richer data, more flexible and transparent analysis, and faster time to value than any other provider on the market. We’ve helped companies reduce fraud by 95% and achieve 32x ROI, and we’re growing fast, thanks to our partnerships with some of the world’s most ambitious digital brands like Revolut, Wise, and Bilt.

A Senior Software Engineer in our organization brings strong software engineering expertise first but also comes with a strong mentoring mindset to support engineering teams and work closely with our engineering leadership. SEON relies on a product-led growth approach.

Join our
ID Verification Team
, responsible for a vital and growing product within SEON. We own the development of our ID verification services, encompassing multiple backend components, SDKs, and the relevant parts of our customer-facing platforms. As we evolve our currently beta product into a core part of SEON's fraud analysis suite, we are focused on continuous feature delivery and exploring innovative improvements to enhance our customers' fraud prevention workflows. Our work spans frontend development (React-based SDK and admin dashboard), backend and Lambda functions (Node.js), database design (Postgres + pgvector), and architecting solutions for intricate technical problems.

This role offers flexibility and is based in our
Budapest
office with a
hybrid
work schedule.

What You’ll Do

  • Contribute to our ID Verification team, which is growing to be an essential part of our fraud prevention solution
  • Deliver high-quality NodeJS, TypeScript and React code with simplicity, performance, and scalability in mind
  • Work together with the team to design and implement cutting edge client and database-related application features
  • Maintain & develop in NodeJS, TypeScript, React, NestJS, REST, RDBMS & backend of our applications
  • Supporting, refining and suggesting improvements to the current codebase
  • Providing expertise, reviewing pull requests of other team members suggesting improvements and best practices for the team
  • Help during the whole Software Development Life Cycle including the design of new features and services
  • Bring an engineering mindset, you care about how things work, how they scale, and how they can be improved over time.

WHAT YOU’ll BRING

  • At least 5+ years experience in fullstack software engineering (NodeJS, TypeScript, React, REST, RDBMS, NOSQL)
  • Agile & iterative mindset (end-to-end responsibility; you build it, you run it)
  • End to end ownership from product requirements, planning, implementation and rollout.
  • Strong experience in automated tests
  • Strong experience in performance optimization
  • Knowledge & understanding of IT security
  • Experience in designing modular systems and refactoring / decoupling monoliths, working with microservices
  • Familiarity with event-driven architecture
  • Experience in containerization (Docker) and Kubernetes
  • Experience in continuous integration and delivery
  • Experience working in self organizing cross-functional teams
  • Excellent problem-solving skills
  • Experience in mentoring senior and mid-weight colleagues
  • English Language Proficiency
  • Experience in pair programming, TDD and Trunk Based Development (pro)
  • Experience in AWS (pro)

Amazing If You Also Have

  • Hands on experience with SDK development
  • Hands on experience with ID Verification

SEON Technologies collects and processes personal data in accordance with applicable data protection laws. If you are a European Job Applicant see the privacy notice for further details.

SEON is an equal opportunity employer. We strive to embrace what makes each one of us unique; we each have our own story. Whether looking at our current staff or future team members, we believe that everyone has something to contribute, and our employment practices reflect that. We do not make an employment decision based upon race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. Please let your recruiter know if you need reasonable adjustments to our recruitment process.

Compensation Range: HUF 21,257,275 - HUF 28,759,841

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

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We take the posting apart down to the real requirements and rewrite your resume against it — by asking, not inventing: no line appears without your confirmation. Sign in to get it first, and to enter the draw.

  • A resume for this exact role, not a universal one
  • Answers are kept: edit any one, not the whole conversation
  • All in your account — open it from any device

On the wheel

A discount on mentoring

Winners are drawn at random among entries with a confirmed email. The date and the full rules are on the draw page.

Draw rules

Fullstack Engineer

Software Engineer (AI Training)

Alignerr

Budapest

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Role description

About The Role
What if the code you write could directly shape how the next generation of AI understands and generates software? We're looking for Software Engineers in Budapest to build, evaluate, and improve AI-generated code — helping train AI systems to think like real developers.

You'll write solutions, review AI outputs, and provide the expert-level feedback that makes AI coding assistants smarter, safer, and more reliable. This is hands-on engineering work at the frontier of AI development — not theoretical, not bureaucratic, and not boring.

This is a fully remote, flexible contract role. If you can write clean code and explain your reasoning, we want to hear from you.

  • Organization: Alignerr
  • Type: Hourly Contract
  • Location: Remote
  • Commitment: 10–40 hours/week

What You'll Do

  • Write, debug, and optimize code across a range of languages, frameworks, and problem domains
  • Review and evaluate AI-generated code for correctness, efficiency, readability, and best practices
  • Identify bugs, logic errors, security issues, and performance bottlenecks in AI outputs
  • Provide structured, detailed feedback explaining why code works — or doesn't
  • Design challenging coding prompts and edge-case scenarios to stress-test AI capabilities
  • Compare and rank multiple AI-generated solutions based on engineering quality
  • Work independently and asynchronously — fully on your own schedule

Who You Are

  • Proficient in one or more programming languages (Python, JavaScript, Java, C++, Go, TypeScript, or similar)
  • Solid understanding of data structures, algorithms, and software design principles
  • Able to read, write, and reason about code with clarity and precision
  • Strong problem-solving instincts and a systematic debugging approach
  • Clear written communicator — you can explain technical decisions in plain language
  • Self-motivated and reliable when working independently without supervision
  • Bachelor's degree in Computer Science, Software Engineering, or a related field — or equivalent practical experience

Nice to Have

  • Experience across multiple languages or tech stacks (full-stack, backend, systems, data engineering)
  • Familiarity with AI/ML concepts, LLMs, or prompt engineering
  • Background in code review, technical writing, or mentoring junior developers
  • Experience with cloud platforms, DevOps, or distributed systems
  • Competitive programming, open-source contributions, or side projects that demonstrate your craft
  • Advanced degree in Computer Science or related discipline

Why Join Us

  • Work on cutting-edge AI projects alongside leading research labs
  • Fully remote and flexible — set your own hours and work from anywhere
  • Freelance autonomy with intellectually stimulating, high-impact work
  • Directly influence how AI writes, understands, and reasons about code
  • Sharpen your own engineering skills by evaluating diverse problems daily
  • Potential for ongoing work and contract extension as new projects launch

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Fullstack Engineer

.NET Software Engineer

Sonrisa Technologies

Budapest

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Role description

You'll be working on international, diversified, greenfield projects, ranked from small to middle size which last approx 1-2 ys.

IT’S ALL ABOUT…

  • Working in agile development team
  • Being obsessed of tested, clean, maintainable code

WE HAVE MANY THINGS TO OFFER!

Flexible schedule, international projects, home office kit, healthcare
and more, you name it. Check out the whole list of benefits on our dedicated page, by clicking the following link:
Benefits

WHAT YOU HAVE

  • 5+ years of C#, .NET, ASP.NET experience
  • Experience with AI tools
  • Solid understanding of OO principles
  • Understanding of data structures, algorithms, distributed systems, databases, and programming languages
  • Independent work and self-check (surprising)
  • English

GREAT PLUS…

  • Database technologies
  • ORM frameworks
  • Design patterns
  • Good understanding of DevOps tools
  • UI ergonomics and UX best practices
  • Experience with frontend technologies (e.g., mobile, web etc.)

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Fullstack Engineer

Full Stack fejlesztő (PHP)

wherewework Jobs

Budapest

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Role description

wherewework.hu a

Technology & Software Employers in Hungary
nevében

Érdeklik a(z) Full Stack fejlesztő (PHP) állások Magyarország területén? Jó helyen jár.

A szoftverfejlesztés továbbra is az egyik legkeresettebb szakterület Magyarország egész területén, ahol a termékcégek, a bankok, az autóipari szoftverrészlegek és a nagy multinacionális fejlesztőközpontok tartós keresletet támasztanak. Budapest koncentrálja a legtöbb nyitott pozíciót az országban. A munkáltatók a globális fejlesztőközpontoktól a gyorsan növő magyar termékcégekig terjednek.

A továbblépéshez egyszerűen töltse fel önéletrajzát a wherewework oldalára, és mi segítünk összekapcsolni valódi Full Stack fejlesztő (PHP) álláslehetőségekkel valódi cégektől, beleértve az éppen megtekintett pozíciót is.

Így működik:

  • Töltse fel egyszer az önéletrajzát. Kattintson az "Jelentkezés" gombra ebben az ablakban. Csak egy pillanat, és lehetővé teszi, hogy profilját releváns Full Stack fejlesztő (PHP) lehetőségekkel párosítsuk.
  • Valódi, a tapasztalatához illő szerepekkel párosítjuk. Amikor a cégek az Ön készségeihez illő Full Stack fejlesztő (PHP) pozíciókat nyitnak, kiválasztjuk Önnek a legjobb lehetőségeket.
  • Ön végig kézben tartja az irányítást. Mielőtt önéletrajzát bárkivel megosztanánk, értesítjük a pontos álláscímmel és cégnévvel, és megerősítést kérünk.
  • Csak a megerősített jelentkezéseket küldjük el a munkáltatóknak. Miután jóváhagyta, a munkáltató megkapja a jelentkezését, és közvetlenül felveheti Önnel a kapcsolatot.

A(z) Full Stack fejlesztő (PHP) szerepeknél Budapest területén a fizetés jellemzően havi 640 000 HUF és 1 520 000 HUF bruttó között mozog, átlagosan körülbelül 1 080 000 HUF bruttó értékkel. A specializált technológiák, a felhős tapasztalat és a rendszertervezési képesség a magasabb fizetés legvilágosabb útjai.

Amíg itt van, fedezze fel a wherewework oldalt, hogy megtudja, milyen valójában Magyarország vezető technológiai cégeinél dolgozni, interjútapasztalatokon, munkavállalói véleményeken és közösségi visszajelzéseken keresztül.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

Fullstack Engineer

Frontend Software Engineer (HU/RO/SRB)

Sonrisa Technologies

Budapest

Apply on the employer's site

Role description

You'll be working on international, diversified, greenfield projects, ranked from small to middle size which last approx 1-2 years!
It’s All About…

  • Working in an agile development team
  • Creating complex custom-designed web applications and developing various highly scalable frontend systems
  • Becoming a game changer, a superhero, and a role model for the less experienced ones
  • Task estimation, test automation, deployment automation and Continuous Integration
  • Being a huge fan of clean code, code review and refactoring
  • Making pixel-perfect websites based on a graphic & making responsive designs to any screen size and resolution
  • Problem-solving, tracking and following up on a variety of complex technical issues with internal and external stakeholders
  • Research cutting-edge technologies

WE HAVE MANY THINGS TO OFFER!
Flexible schedule, international projects, home office kit, healthcare
and more, you name it. Check out the whole list of benefits on our dedicated page, by clicking the following link:
Benefits
What You Have

  • 5+ years web frontend development using Angular or React or Vue.js
  • Experience with AI tools
  • Excellent in JavaScript/TypeScript
  • Solid understanding of semantic HTML and CSS
  • Understanding core web and browser concepts
  • Advanced in front-end optimization and debugging techniques
  • Understand code structuring and component decoupling
  • Experience using REST APIs
  • Front-end build pipelines
  • Excellent in Git usage
  • BitBucket / GitLab or other software versioning platforms
  • Professional English

GREAT PLUS…

  • GraphQL
  • LESS OR SASS
  • Styling framework (Bootstrap, Material design)
  • Docker virtualization tool

Budapest-based engineering partner for mid-market companies that have outgrown their legacy systems. Senior engineers who stay. 20 years in market.

This is a saved copy of a posting published elsewhere. Postings get taken down without notice — check the employer's site before applying. mentors.coach is not the hiring party.

2 more openings in this category and country

Senior Software Engineer (ID Verification Team)SEON · Hungary

Apply on the employer's site