Solution Developer - Digital Assets and Blockchain Integrations (.NET) | SEB, Solna

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

Do you want to build the integration layer between traditional banking and the emerging world of digital assets and be part of the core Digital Assets team of SEB? Join SEB’s Digital Assets team and be part of an exciting new chapter in the evolution of financial services! You’ll work alongside experienced colleagues across technology, payments and business to help shape SEB’s approach to digital assets.

About this role:

As a Solution Developer, you will help build an orchestration layer connecting SEB’s core banking systems with external custody and wallet providers and a token issuer, starting with Ethereum. SEB is a founding member of Qivalis, a consortium of leading European banks working to launch a regulated, euro-denominated stablecoin. The platform will connect existing banking and payment infrastructure with digital-asset services, supporting this initiative and future use cases. You will design, develop and maintain secure, resilient backend services and API integrations using .NET, Python and Terraform, working with REST APIs, webhooks, mutual TLS and OAuth 2.0. You will help ensure reliable transaction processing, monitoring and compliance with relevant security and regulatory requirements. Working closely with product management, payment specialists, architects, security and compliance teams, as well as external technology providers, you will translate business and regulatory needs into robust technical solutions.

In this role, you will:

• 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, transaction finality and operational exception handling
• Establish secure approaches to cryptographic key management using technologies and standards such as HSM, MPC, PKCS#11 and hierarchical key derivation
• Support payment integration based on SEPA Instant and ISO 20022, including pacs.008 messages
• Embed AML and KYC screening, Travel Rule controls and on-chain analytics into relevant transaction flows
• Build secure, observable and resilient services on Kubernetes and Google Cloud, including multi-zone disaster recovery
• Apply engineering practices in line with MiCAR, DORA and SEB’s security and operational requirements

To thrive in this role, we believe you have:

• Strong hands-on experience developing backend services using .NET.
• Experience building API integrations and containerised services, with practical knowledge of Python and Terraform.
• Experience with REST APIs, webhooks and secure authentication mechanisms such as mutual TLS and OAuth 2.0.
• Experience with payments, banking integrations or other business-critical transaction platforms where security, traceability and resilience are essential.
• The ability to translate business and technical requirements into robust solutions and collaborate effectively across technology, product, security and compliance teams.

It’s a plus if you have experience with:

• Blockchain and digital assets: Ethereum transactions, ERC-20 tokens, gas management, transaction finality or Solidity.
• Cryptographic security and key management: HSM, MPC, PKCS#11 or key derivation standards such as SLIP-0010 and BIP32.
• Payments and financial messaging: SEPA Instant and ISO 20022, particularly pacs.008.
• Custody platforms: Fireblocks, Ripple, Taurus, Zodia or similar.
• Compliance and regulation: AML/KYC screening, the Travel Rule, on-chain analytics tools such as Chainalysis, Elliptic or TRM Labs, and awareness of MiCAR and DORA.
• Cloud infrastructure and resilience: Kubernetes, Google Cloud and multi-zone disaster recovery.

We value clear communication, a pragmatic approach to problem-solving and the ability to work in a domain where technology, standards and regulatory expectations continue to evolve. You have a genuine interest in digital assets and AI, take ownership of your professional development and use AI tools thoughtfully to improve your development workflow and productivity.

What we offer:

We offer many experiences and benefits to our employees, and there is nuance to every individual’s career experience, but the elements that define the core of our offering are:

• The opportunity to contribute to the development of SEB’s digital-assets platform and its first blockchain-based product
• Professional development in an emerging technology area with direct relevance to the future of financial services
• Insight into stable coins, digital wallets, blockchain integration and institutional financial markets
• A dynamic, professional and multicultural environment
• An empowering and inclusive workplace culture
• A hybrid workplace setup

Ready to take the next step on your career journey?

If you have questions about the position please contact Johan Schalling, Team manager on [phone] or at [e-mail].

Please be aware that our final candidates undergo background checks, a process that includes for example identity control, verification of qualifications, credit checks, company engagements and history of crime. In some cases, we also apply random drug checks. During employment, employees within SEB can also expect to undergo recurring background checks. SEB Sweden has a redeployment responsibility, why this position might be covered by internal redeployment.