Backend Engineer: Digital Assets & Blockchain (.NET)

SEB; Solna kommun; Hybrid; SEK 850,000 - 1,150,000; Full time

Benefits offered by this job

Hybrid workplace

Job summary

SEB is seeking a Solution Developer to help build an orchestration layer connecting SEB’s core banking systems with external custody and wallet providers, starting with Ethereum. You will design, develop and maintain secure backend services and API integrations using .NET, Python and Terraform, while ensuring compliant, observable systems.

We value collaboration with product, security and compliance teams and a passion for digital assets in a hybrid workplace.

Qualifications

• Strong hands-on experience developing backend services using .NET.
• Experience building API integrations and containerised services with Python and Terraform.
• Experience with REST APIs, webhooks, mutual TLS and OAuth 2.0.

Responsibilities

• Design and develop an orchestration layer between core banking, custody and wallet providers, and token issuers.
• Build and maintain containerised back-end services using .NET and Python, with infrastructure defined through Terraform.
• Design secure API integrations using REST, webhooks, mutual TLS and OAuth 2.0.
• Integrate banking and payment flows with custody platforms, digital wallets and blockchain-based services.
• Design transaction flows for Ethereum and ERC-20 tokens, including gas management, finality and exception handling.
• Establish secure cryptographic key management across HSM, MPC, PKCS#11 and derivation standards.
• Support payment integration based on SEPA Instant and ISO 20022, including pacs.008 messages.
• Embed AML/KYC screening and on-chain analytics into transaction flows.
• Build secure, observable services on Kubernetes and Google Cloud with multi-zone DR.
• Apply engineering practices aligned with MiCAR, DORA and SEB security requirements.

Skills

Backend development

API integration

Cloud services

Tools

.NET

Python

Terraform

REST APIs

Kubernetes

Google Cloud

Job description

SEB is seeking a Solution Developer to help build an orchestration layer connecting SEB’s core banking systems with external custody and wallet providers, starting with Ethereum. You will design, develop and maintain secure backend services and API integrations using .NET, Python and Terraform, while ensuring compliant, observable systems.

We value collaboration with product, security and compliance teams and a passion for digital assets in a hybrid workplace.