Senior Software Engineer (AML Team)
Confirmed on the employer's own hiring board on Oct 21, 2026. First seen by Alion on Oct 20, 2026.
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.
As a Senior Software Engineer on the AML team, you’ll own the design and delivery of the TypeScript applications and services behind SEON’s AML products. You’ll work closely with product managers to understand what customers actually need, turn requirements and customer requests (including those raised through NRQs) into well-scoped features, and ship them with quality, performance and security in mind. We want someone who asks “why”, flags gaps early and challenges solutions when something doesn’t add up. You are a continuous learner biased towards action. You raise the bar for the engineers around you through your code, your reviews and your mentoring. While you use AI in your day to day work, you use solid judgement on when and how it should be used. This is the next step up from our Software Engineer role: where a Software Engineer scopes and delivers their own work well, you also shape the design and delivery of the team’s work and help others do the same.
This position is in Hungary, with the flexibility to work fully remote or hybrid.
WHAT YOU’LL DO:
Design and build well-architected TypeScript features end to end for our AML services (case management, business backends and person service), and our customer facing Admin Panel, treating performance, scalability, security and observability as part of the design
Lead team-level design reviews and write design docs or ADRs for significant changes, accounting for how your services interact with the rest of the SEON platform
Challenge requirements that don’t add up, and raise delivery risks early with a proposed mitigation
Consistently deliver high-quality code with simplicity, security, testability, performance, and scalability in focus, setting the example others follow
Maintain and develop client-side JavaScript libraries, the Node.js backend of AML Services and Nest.js / ExpressJS services
Take part in the on-call rotation, debug complex cross-system issues and drive root cause analysis for significant incidents, with blameless follow-up
Proactively improve monitoring, alerting and runbooks for the services you own
Own the testing approach for your services, setting quality gates and keeping the code maintainable and well tested
Prioritize and fix issues reported by QA and customers, and bring the customer’s voice into planning and prioritization
Track implementation progress using company processes and software (github / jira)
Review code written by the team with technical depth, giving direct, constructive feedback that helps others grow
Collaborate with your PM, the QA team, Architects and the Devops team on a continuous basis, and communicate with senior stakeholders so decisions are framed well and context reaches the whole team.
Lead planning and estimation, break large and ambiguous projects into incremental work streams, and step into a tech or project lead role on significant initiatives, setting the pace and unblocking others.
Drive improvements to the team’s CI/CD pipelines, tooling and ways of working, and use retrospective data and delivery metrics to measure the results
Work with large datasets, such as screening and watchlist data, keeping them performant, accurate and auditable.
Use AI-assisted development tools in your day-to-day work, and help us find where AI can improve our products and the way we build them.
Turn what works into reusable team standards such as templates, prompts and playbooks.
Mentor engineers across the team, giving feedback that helps them grow, and share knowledge so it does not stay with one person
WHAT YOU’ll BRING:
Excellent problem-solving skills
At least 6 years of experience in Software Development, including owning the design and delivery of production services
Excellent working knowledge JavaScript/Typescript and stable knowledge of HTML5/CSS3 and RESTful API development
Ability to cooperate with team members in an Agile development environment
Experience designing for non-functional requirements and leading technical design discussions
Experience operating what you build: monitoring, on-call, incident response and root cause analysis
A track record of mentoring and of leading projects or work streams without needing a management title
Out-of-the-box thinking combined with the ability to adapt to a fast-paced environment
Fluency in English
Technical requirements:
JavaScript, Typescript, React, Node and NestJS
HTML5, CSS3 (Sass)
PostgreSQL
ElasticSearch
AWS
Terraform
AMAZING IF YOU ALSO HAVE:
Experience with data heavy applications
Experience working in a regulated industry, such as AML, KYC or financial services
Experience driving cross-team technical work
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.