Kotlin/Java backend developer for fintech and scalable systems
I deliver secure, fast backends, integrations, and system architecture that drive revenue growth and operational confidence.
Get in touchAbout me
I am a software developer focused on backend development, system architecture, and AWS cloud. I run a one-person software consultancy serving B2B clients across fintech, aerospace, and social-impact projects.
I combine enterprise delivery (Hargreaves Lansdown, Aviva, Swissquote Bank, Moss) with building products from scratch (getnarra.app) and R&D solutions (satellite constellation management software at GomSpace).
Professional experience
Fintech software development
Hargreaves Lansdown, Aviva, Swissquote Bank, Moss — critical backends, payment integrations, and systems built for compliance.
Aerospace
GomSpace — satellite constellation management software; highly available services and reliable telemetry.
Products
getnarra.app — own product; Rak’n’Roll volunteer portal — co-creator; Game of Code 2021 winner in Luxembourg.
Services
Backend development
Kotlin, Java, Spring Boot, Ktor; API design, event-driven flows, security, and observability.
System architecture
Scalable systems, modular monoliths, microservices, domain-driven design, high availability.
Integrations
Payment, banking, ERP/CRM integrations; message brokers; API gateways; resilient queues and retries.
MVP & prototypes
Rapid MVPs, PoCs, and roadmaps; measurable success metrics, ready to scale further.
Cloud and DevOps
AWS (ECS, Lambda, RDS, S3), IaC (Terraform), CI/CD, automation, cost efficiency.
Code review and consulting
Code reviews, architecture audits, team mentoring, and 1:1 consulting sessions.
Tech stack
Kotlin, Java, Spring Boot, Ktor, PostgreSQL, Redis, Kafka, RabbitMQ, GraphQL, REST, OpenAPI, Docker, Kubernetes (basics), AWS (ECS, Lambda, RDS, S3), Terraform, GitHub Actions, Prometheus, Grafana.
Case studies
Fintech: authentication and compliance
Problem: Unstable client logins and security audit findings.
Solution: Refactored Kotlin/Spring auth services, implemented OIDC, and centralized event logging with alerting.
Result: 60% fewer login incidents, full compliance for audit checkpoints.
SaaS: API scaling
Problem: Traffic spikes caused API latency and timeouts.
Solution: Moved critical flows to asynchronous workers, added Redis cache layer, auto-scaling on AWS ECS.
Result: 3x faster API responses, no timeouts at peak load.
Banking integrations
Problem: Delays in synchronizing data with banking partners.
Solution: Kafka queues, idempotent processors, SLA monitoring, and automatic retries.
Result: 99.9% on-time sync, predictable SLAs for B2B clients.
Why work with me
- Blend of enterprise reliability and startup speed: stable processes with fast MVP delivery.
- Proactive communication with clear technical and business KPIs.
- Scalable, audit-ready designs prepared for volume growth and security reviews.
- Workshop-style collaboration with client teams: rapid architectural decisions and handover.
- Transparent costs, data-driven estimates, iterative delivery plans.
FAQ
Which industries do you serve?
Fintech, B2B SaaS, insurtech, banking, aerospace, and socially responsible initiatives.
Which technologies do you use?
Kotlin, Java, Spring Boot, Ktor, PostgreSQL, Redis, Kafka/RabbitMQ, AWS, Terraform, GraphQL/REST.
Do you build MVPs?
Yes, I design and deliver MVPs and prototypes ready for customer validation and scaling.
Do you offer consulting?
Yes, I run architecture consultations, code reviews, and technology workshops for teams.
How does collaboration work?
We start with a short audit, define KPIs, plan iterations, and deliver measurable outcomes.
Do you work remotely?
Yes, I work remotely with responsive communication and regular progress reviews.
Let’s talk
Need an experienced Kotlin developer or system architect for fintech, SaaS, or integration work? I respond quickly with clear next steps.
Get in touch