Measure before optimizing
The 1,500 ms to 340 ms latency reduction started with a week of tracing, not a rewrite. Profiling found the queueing; the fix was small.
Senior Backend EngineerFinTech & Banking Systems
AshkanRahmani
I build and scale the backend systems that national banking infrastructure runs on — microservices platforms handling more than 40 million transactions a day, designed for latency, resilience, and the people who operate them.
Based in Tehran. Since 2012 at Informatics Services Corporation, most recently leading a team of 16 engineers on platforms that settle tens of millions of transactions daily.
Open to European roles · visa sponsorship · start within two months
- 40M+
- transactions per day
- across platforms I architected and scaled
- 16
- engineers led
- as tech lead at ISC since 2020
- 340ms
- response latency
- down from 1,500 ms on core transaction paths
- 99.9%
- uptime
- sustained across core banking systems
Profile
Backend engineering for systems that cannot fail quietly.
I have spent most of my career inside financial infrastructure: the interbank exchanges, monitoring platforms, and authentication services that banks depend on every day. The work is unglamorous and unforgiving. A missed transaction or a delayed settlement has a real cost, so I optimize for correctness first and speed second — then measure both.
As a tech lead I work across architecture and delivery: decomposing monoliths into services with clear ownership, introducing event-driven flows with Kafka, and building the observability that lets a team find a problem before a customer does. A large part of the job is human — code review, mentoring, and keeping sixteen engineers pointed at the same definition of done.
More recently I have been folding AI-assisted workflows into day-to-day delivery — GitHub Copilot and agentic coding tools. Used well, they shorten the loop between an idea and a verified change. Used carelessly, they create review debt. Keeping a team on the right side of that line is part of the work now.
- Currently
- Tech Lead, Informatics Services Corporation
- Focus
- Distributed systems, event-driven architecture, performance
- Open to
- Senior backend and tech lead roles in Europe
- Availability
- Visa sponsorship required · start within two months
Make failure boring
Idempotent handlers, bounded retries, and alerts that page a human only when a human is genuinely needed.
Ship in reversible steps
Deployment frequency doubled because each change was small enough to roll back without a war room.
Selected work
Six systems behind the money.
National-scale platforms delivered with the teams I led or worked in at Informatics Services Corporation. The volumes are daily production figures, not projections.
A centralized platform that watches transaction flows across the national interbank network and turns anomalies into incidents someone can act on.
- Java
- Spring Boot
- Kafka
- PostgreSQL
- ELK
- Processes more than 30 million transactions every day across 33 connected banks.
- Cut incident detection and response time by 80% with real-time alerting and operational dashboards.
A large-scale platform for issuing, endorsing, and settling digital cheques with legally valid electronic signatures.
- Java
- Spring Boot
- Oracle
- Kafka
- Handles 10 million transactions per day in production.
- Improved transaction processing speed by 30% through service-level tuning and asynchronous processing.
A nationwide system that unified how banks issue and register cheque books under a central banking authority.
- Java
- Spring Boot
- Oracle
- ActiveMQ
- Sustained 800,000 daily requests for a regulator overseeing nationwide financial operations.
- Reduced processing time by 15% while keeping regulatory reporting consistent.
Replaced physical cheque transfer between banks with electronic image exchange, then calculates net interbank positions at close of day.
- Java
- Spring Boot
- Kafka
- PostgreSQL
- Moves more than one million cheque images and messages between banks daily.
- Reduced interbank settlement time by two days.
Backend services for a retail internet banking platform deployed across multiple banks.
- Java
- Spring Boot
- Oracle
- Redis
- Supported two million or more daily transactions per bank.
- Held a 99.9% uptime SLA in production.
A central authentication service for the group's products, with usage logging and billing built in from the start.
- Java
- Spring Boot
- OAuth2
- Keycloak
- Redis
- Secured access for more than 12 integrated services using OAuth2, JWT, and custom protocols.
- Reduced security incidents by 8%; usage logging feeds per-service billing.
Figures are daily production volumes, 2012 — 2026. These systems run inside national banking infrastructure; architecture walkthroughs are available on request.
Experience
Fourteen years of financial infrastructure.
From Java developer to tech lead, all of it in backend engineering for banking, insurance, and enterprise systems.
2012 — Present
Informatics Services Corporation
Tehran, IranTech Lead
2020 — Present- Lead a team of 16 engineers building enterprise-scale banking platforms, from architecture through production support.
- Architected and scaled microservices platforms handling 40M+ transactions per day with high availability and resilience.
- Reduced latency from 1,500 ms to 340 ms and improved overall system performance by 20%.
- Raised platform uptime to 99.9% through better monitoring, alerting, and incident response.
- Doubled deployment frequency with CI/CD pipelines and cut the incident rate by 60%.
- Introduced AI-assisted engineering workflows with GitHub Copilot and coding agents to compress delivery cycles.
Senior Software Engineer
2012 — 2024- Built high-performance backend services in Java and Spring Boot for national banking products.
- Delivered REST APIs serving 2.5 million concurrent users.
- Improved system efficiency by 60% through profiling, caching, and query tuning.
- Implemented event-driven architecture with Kafka to decouple high-volume processing.
2011 — 2012
PH Developers Engineering Co.
Tehran, IranJava Developer
2011 — 2012- Developed backend services and internal tooling for enterprise clients.
2007 — 2011
Moj Pardaz Co. Ltd
Tehran, IranJava Developer
2007 — 2011- Built enterprise software across healthcare, insurance, and industrial domains.
2002 — 2007
Negin Valiasr Co. Ltd
Tehran, IranSoftware Developer
2002 — 2007- Contributed to backend development and system design for enterprise applications.
Capabilities
Tools I have run in production.
Not a wish list. These are the languages, stores, and platforms behind the systems above — and the practices that keep them maintainable.
Architecture
- Distributed systems
- Microservices
- Event-driven design
- DDD
- CQRS
- API design (REST, GraphQL)
Languages & frameworks
- Java
- Spring Boot
- Spring Framework
- Hibernate
Data stores
- PostgreSQL
- Oracle
- MongoDB
- Redis
Messaging
- Kafka
- RabbitMQ
- ActiveMQ
Cloud & operations
- AWS (EC2, ECS, S3, RDS, Lambda, SQS)
- Docker
- CI/CD
- ELK Stack
- Grafana
Security
- OAuth2
- JWT
- Keycloak
- Authentication & authorization
Engineering practice
- Technical leadership
- Performance tuning
- AI-assisted development
- JUnit, Mockito
- Maven, Gradle
Education
- BSc Computer Science, Software Engineering
- Azad University, 2012
- Completed while working full-time
EnglishProfessional working proficiency (B2)
PersianNative
Contact
Hiring for a senior backend role in Europe?
I am open to senior backend engineer and tech lead positions, on-site or hybrid, with visa sponsorship. Available to start within two months.