Senior Software Engineer

Helsinki, Finland, 27 June 2025

Are you an experienced software engineer who would like to be at the forefront of defining digital finance as part of an innovative product company?

Tesseract Investment, a regulated institutional digital asset lending company founded in Finland in 2017, is now looking for a Senior Software Engineer to join their experienced software team in Helsinki, and to support the development of new features.

Tesseract partners with crypto exchanges and wallet providers to deliver yield-generating investment products to end users who typically are crypto owners. For partners, the company offers a set of APIs and guides them in their integration work. Behind the APIs, Tesseract has a proprietary software platform designed for multi-tenant access, developed and maintained by the Helsinki team over several years. The platform integrates with several third-party service providers, e.g. digital asset custody for crypto asset transfers and KYC providers for verifying end-user identity.

Role

As a Senior Software Engineer, you will join a team of five software professionals. In this role, you will contribute to delivering new product features while maintaining the existing by producing clean, well-tested, well-documented, and elegant backend and occasionally frontend code. You will also have a role in deploying and running our live services – you build it, you run it.

The team is a group of high performers with great communication skills, who know when to take initiative but also when to ask for help. The team strives for high-velocity and top-quality output, and they love the fast-paced environment that drives them to become the next generation of problem-solvers. Cross team collaboration with our business, legal, compliance and ops teams is important for us to get both details and bigger picture right.

Tesseract’s platforms are deployed to AWS and run services on top of EKS. The code is mostly based on TypeScript and PostgreSQL is used as the main data storage. Test automation, security, and high availability are important for the team. Tesseract is ISO27001 and SOC 2 Type 2 certified while not compromising agility in their software development.

We are looking for a person with:

• Approximately 8 years of relevant software development experience (programming, databases, architecture design, etc.) mostly from backends
• Experience in working with production systems, ideally from product or SaaS context
• Excellent programming skills with TypeScript and solid proficiency in relational databases, preferably PostgreSQL
• Experience from software engineering teams who want to maintain high test coverages
• Experience in containers and their orchestration, e.g. Docker and Kubernetes
• Hands-on experience in crypto & blockchain and/or web3. E.g. Interfacing exchanges or custodies via API, Interfacing other ecosystem API’s, using web3 libraries on backend to query blockchain or making transactions, using web3 libraries to interact with smart contracts, or something similar
• A systematic approach to development with an agile get things done attitude
• Professional working proficiency in English, both written and verbal

We consider as an asset:

• Experience in developing system and acceptance test automation
• Experience in frontend development with React

Process

1. Interview by VP of Engineering
2. Interview by Product Manager and Senior SW Engineer
3. Takehome assignment
4. Live assignment
5. Interview by CEO

How to Apply

Please submit the following:

• Resume/CV detailing relevant experience
• Cover letter outlining why you would be a great fit for this role

Please send your application to careers@tesseract.fi