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Senior Software Engineer (IR-525)

2 weeks ago
Ukraine
Full-time
Senior
Software Engineer
Software Development
AWS C++ Go Java Kafka Kubernetes Microservices NATS PostgreSQL RabbitMQ Redis REST API
Apply Now
Intellectsoft

Intellectsoft

Intellectsoft is a leading software development company offering a wide range of services including mobile strategy, app development, web development, and enterprise solutions.

Internet Software & Services
251-1K
Founded 2007
View All Jobs 13

Description

  • Design and integrate systems with payment processors, banks, custodians, payout providers, and fiat/stablecoin rails.
  • Build unified internal APIs that abstract differences across external providers.
  • Standardize external API and webhook data into consistent internal models.
  • Develop reliable payment flows for deposits, withdrawals, payouts, settlements, funding, and reconciliation.
  • Manage retries, idempotency, duplicate or delayed webhooks, partial settlements, provider failures, and state recovery.
  • Build event-driven, asynchronous systems using NATS JetStream, Redis, and PostgreSQL.
  • Implement end-to-end transaction tracking and lifecycle state management.
  • Improve system resilience, observability, audit trails, and operational tooling across payments.
  • Work across modern Go microservices and legacy Java/Spring systems.
  • Support migration efforts from RabbitMQ to NATS and from monolith architecture to services.
  • Partner closely with product, operations, finance, and infrastructure teams.

Requirements

  • Strong experience in Go and/or Java; C++ may also be considered.
  • Strong API integration experience with REST APIs, webhooks, idempotency handling, error recovery, authentication and authorization, retries, and backoff strategies.
  • Experience with Kafka, NATS, RabbitMQ, Redis, and PostgreSQL.
  • Excellent production debugging and troubleshooting skills.
  • Strong expertise in concurrency, distributed architectures, and system performance optimization.
  • Familiarity with Kubernetes and AWS deployments.
  • Payments or financial systems experience, including reconciliation workflows, transaction lifecycle management, stablecoin or digital asset payment rails, ledgering systems, and banking or fintech integrations.
  • Experience building asynchronous or event-driven systems.
  • Product-oriented mindset with the ability to design scalable unified APIs across multiple providers.
  • Strong ownership mentality and ability to execute quickly in a startup environment.
  • Experience with banking APIs, payment gateways, stablecoin infrastructure, or treasury systems is preferred.
  • Experience with FIX protocol, custodial platforms, and crypto trading infrastructure is preferred.
  • Experience migrating legacy systems into modern service-oriented architectures is preferred.
  • Exposure to low-latency or high-throughput financial systems is preferred.
  • Familiarity with accounting or ledgering concepts is preferred.

Benefits

  • Awesome projects with an impact.
  • Udemy courses of your choice.
  • Team-buildings, events, marathons, and charity activities.
  • Workshops, trainings, and expert knowledge-sharing.
  • Clear career path.
  • Absence days for work-life balance.
  • Flexible hours and work setup, including the ability to work from anywhere.

Interested in this position?

Apply directly on the company website

Apply Now

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