Key Facts

Remote From:

Full time

Senior (5-10 years)

English, Russian

Hard Skills

Spring AOP Kotlin PostgreSQL JavaScript Libraries Bank Reconciliations Full-Text Search PkMS Application Programming Interface (API) JSON Application Programming Interface (API) +23 more

Other Skills

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Team Leadership

Roles & Responsibilities

At least 4-5 years of experience with Java/Kotlin (Spring Boot)
Solid experience building REST APIs and backend systems
Hands-on experience with React / Next.js and TypeScript
Strong knowledge of PostgreSQL (queries, indexing, migrations)

Requirements:

Design and implement backend services in Kotlin (Spring Boot) for financial core modules (ledger, settlement, payouts, pricing, reserves) and integrations with payment providers, KYC/KYB, and banking, including webhooks and REST APIs
Develop frontend features with React/Next.js and TypeScript for merchant portal, internal ops/admin tools, and developer portal
Create and optimize BPMN workflows with Camunda 8 (onboarding, AML, disputes, settlements) and support compliance flows (transaction monitoring, SAR)
Ensure quality and reliability with fully automated testing and CI/CD, and handle cross-system reconciliation and reporting

FYST

About FYST

FYST [faist] is a one-stop tech, payments and technology consultancy for eCommerce and FinTech businesses. It empowers entrepreneurs with a unique mix of agile technical payments capabilities, payment technologies guidance, regulatory compliance, and AML advisory services from its team of payment and banking industry leaders. Focused on technological excellence FYST offers clients a full scope of integration and software advisory, complemented by in-house payment gateways development. Designed to help businesses navigate the fast-growing cross-border eCommerce market, FYST brings together leading fintech innovators under one brand, combining unparalleled technical ingenuity, and tailored advice to help fledgling businesses successfully scale up, and receive access to more than 70 global payment methods via the network of partners.

Company type: Scaleup

Founded: 2018

Company size: 51 - 200

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Job description

WHAT YOU'LL BE WORKING ON

Backend (Kotlin): Financial core: ledger, settlement, payouts, pricing, reserves
Integrations: payment providers, KYC/KYB, banking (SEPA/SWIFT)
Webhooks & event-driven processing
REST APIs for product and internal tools
BPMN workflows (Camunda): onboarding, AML, disputes, settlements
Compliance flows: transaction monitoring, SAR
Frontend (Next.js): Merchant portal (transactions, payouts, dashboards, onboarding)
Internal ops/admin tools (AML, disputes, treasury, compliance)
Developer portal (API docs, sandbox, integration guides)
Reconciliation across multiple systems (gateway → processor → bank)
Reporting: regulatory, scheme, financial
Fully automated testing (unit / integration / e2e, no manual QA).

OUR TECH STACK

Backend: Kotlin, Spring Boot 3, Spring Modulith
Frontend: Next.js 15, TypeScript, shadcn/ui, Tailwind CSS
Database: PostgreSQL 18 (RDS, pgvector, JSONB, FTS)
BPMS: Camunda 8 (Zeebe, BPMN, DMN)
Auth: Okta
Infra: AWS, EKS, Docker, GitLab CI/CD

WHAT YOU NEED TO SUCCEED IN THIS ROLE

At least 4-5 years of experience with Java/Kotlin (Spring Boot)
Solid experience building REST APIs and backend systems
Hands-on experience with React / Next.js and TypeScript
Strong knowledge of PostgreSQL (queries, indexing, migrations)
Understanding of event-driven architecture, webhooks, async processing
Experience with API design (versioning, idempotency, error handling)
Experience with CI/CD and Git workflows
Full-stack mindset (not backend-only)
Ability to work with system design and architecture decisions
Proactive approach and ownership (doesn’t wait for tasks, drives solutions)
Testing ownership
AI fluency: actively using AI tools in daily engineering work (not just basic usage)
Comfortable in a fast-paced startup environment, actively contributing ideas and driving solutions end-to-end rather than just executing tasks
Good English level (at least A2-B1) and fluent russian