Senior Software Engineer

On behalf of a client, a technology company delivering advanced software solutions across financial services, we are looking for a Senior Software Engineer.

The Role
You’ll join the engineering team working on a blockchain-based FinTech platform. Specifically, you will:

• Design and build robust, high-performance backend services in C# / .NET Core 8

• Work on cloud-native systems on AWS

• Own PostgreSQL schema design, query optimization, and data integrity

• Build and maintain integrations with KYC providers, crypto custodians, and KYT platforms

• Make architectural decisions on a system where security, performance, and correctness are critical

• Improve CI/CD, infrastructure-as-code, and DevOps practices

• Mentor teammates and collaborate with experienced specialists across several technical disciplines

Who We’re Looking For
You’re an engineer who:

• Takes genuine ownership and exercises sound judgment

• Holds well-reasoned technical opinions and can defend them

• Favors simple, correct solutions that ship over perfect ones that don’t

• Sees seniority as a matter of judgment rather than years of experience

What You Bring

• 5–7 years building production software used by real customers

• Deep C# / .NET expertise

• Strong PostgreSQL skills

• Hands-on AWS experience

• Solid understanding of microservices, API design, and distributed systems trade-offs

• Experience integrating third-party APIs and external services in regulated environments

• Comfort with CI/CD, containerization, and modern DevOps practices

• Good judgment on when to build, when to buy, and when to simplify

Nice to Have

• Experience in FinTech, blockchain, or crypto

• Familiarity with KYC / KYT / AML workflows or providers

• Docker / Kubernetes (EKS, AKS)

• Infrastructure-as-Code (Terraform, Bicep)

• Event-driven architectures (Kafka, RabbitMQ, Service Bus)

• Observability tooling (OpenTelemetry, Datadog, Grafana)

• A strong interest in developer experience and security

What’s on Offer

• Competitive salary and performance bonus

• Retirement and medical benefits

• Additional perks and allowances

• Hybrid working

• A collaborative, growing team of experienced engineers

• The chance to work on cutting-edge technology in a fast-paced environment

• A culture of innovation and continuous learning

Applicants must hold EU citizenship and be eligible to work in Cyprus.

OneJar publishes this vacancy on its own careers site. Applications go straight to OneJar: use the Apply button on this page.