Lead / Senior Backend Developer (Go / Java)

We are looking for a Lead / Senior Backend Developer to design and build the core architecture of a new P2P payment system, including the financial engine, transaction matching, and escrow logic. You will define the technical foundation of the platform — from microservices/modular monolith architecture to transactional integrity, high-load data handling, and API security — and play a key role in building a payment system from scratch.

🌐 Remote

About the Client:

Our client is building a new P2P payment system from the ground up — a fintech product enabling secure, fast, and scalable peer-to-peer transactions. The company is focused on creating reliable payment infrastructure, combining modern architecture with strong transactional guarantees to serve users at scale.

About us:

Vision Grid is a recruitment and consulting agency specializing in IT and executive talent acquisition. With over 13 years of experience in Executive Search and Tech Recruitment, we partner with forward-thinking companies to attract, engage, and hire top-tier professionals — from individual contributors to C-level executives — across multiple geographies.

What You Will Do:

• Design the architecture of a P2P payment platform (microservices or modular monolith).
• Build and own the financial engine, including transaction processing, payment matching logic, and escrow mechanics.
• Design and implement robust transactional logic ensuring data consistency and reliability across distributed payment flows (ACID, Saga Pattern).
• Architect and optimize high-load database solutions (PostgreSQL — sharding, query optimization, indexing strategies) to support growing transaction volumes.
• Design and implement asynchronous, event-driven communication using message brokers (Apache Kafka / RabbitMQ) for reliable payment processing pipelines.
• Utilize in-memory data stores (Redis) for caching, session management, and performance-critical operations.
• Implement and enforce API security best practices (OAuth2, JWT, rate-limiting, fraud detection and prevention mechanisms).
• Make key architectural decisions on scalability, fault tolerance, and system resilience for a mission-critical payment system.
• Collaborate with product, DevOps, and QA teams to ensure smooth delivery, compliance, and system stability.
• Mentor engineers, conduct code reviews, and help establish engineering best practices across the team.
• Take full ownership of critical backend components, from design through production, in a system handling real money movement.

What We Are Looking For:

• 5+ years of commercial development experience in Go or Java/Kotlin.
• Deep understanding of transactional logic (ACID, Saga Pattern) and distributed systems design, ideally applied to financial or payment systems.
• Solid experience with high-load databases, especially PostgreSQL (sharding, query optimization, performance tuning).
• Hands-on experience with message brokers (Apache Kafka / RabbitMQ) and in-memory databases (Redis).
• Experience implementing API protection mechanisms (OAuth2, JWT, rate-limiting, fraud prevention).
• Strong understanding of microservices and/or modular monolith architecture patterns.
• Prior experience building or working on payment systems, wallets, matching engines, escrow logic, or other money-movement infrastructure is a strong plus.
• Solid grasp of system design principles: scalability, fault tolerance, consistency trade-offs, idempotency in financial transactions.
• Ability to make and defend architectural decisions, and communicate them clearly to the team.
• Understanding of payment industry standards, compliance, or regulatory considerations is a plus.
• Upper-Intermediate English level or higher (written and spoken) is a plus.
• Prior experience in fintech, banking, or high-load transactional platforms is a plus.

What You Can Expect:

• A rare opportunity to architect a payment system from zero and shape its entire technical foundation.
• Career growth opportunities with the potential to grow into a Head of Engineering / Tech Lead role.
• Close collaboration with product and engineering leadership, with real influence over key architectural and business-critical decisions.

Interested?

If this role sounds like a good match, we’d be happy to connect and discuss details.

Email: [email protected]
Telegram: Kate_Zvereva

Let’s talk about how you can become part of a growing team 🚀