Blockchain Software Engineer, London at Ctrl Alt Ltd · London

About Ctrl Alt

Ctrl Alt is designing and operating the on-chain infrastructure powering digital capital markets globally. We bring together a unique blend of expertise in financial markets and cutting-edge in-house technology to deliver tailored, compliant solutions in the alternative assets space. Since launching in 2022, we’ve tokenized over $1.5bn in assets across real estate, private credit, funds, litigation finance and more.

We’re building a high-performance, people-first culture where ambitious individuals can thrive. We move fast, think big and hold ourselves to a high bar, while keeping things collaborative, open and genuinely fun. At Ctrl Alt ideas win on merit, teams work closely with leadership, and everyone has a voice in shaping what we build next.

We believe that hard work should come with real reward. You won’t just join a company - you’ll help build one. Last year alone, we grew from 17 to 50 people, and this year we’re going faster and further. That means real responsibility, meaningful impact, and the opportunity to grow alongside a company that’s redefining the future of finance through the tokenization of alternative assets.

If you’re excited by scale-up energy, ownership, and the chance to help shape both a business and a culture, Ctrl Alt is where you can do the most rewarding work of your career.

The Opportunity

We’re looking for a Blockchain Software Engineer to join our team and help build the next generation of Ctrl Alt’s tokenization and governance infrastructure. You’ll work at the intersection of finance and distributed ledger technology, designing secure and reliable on-chain components that power a platform trusted by asset managers, fund administrators, and institutional investors.

You’ll collaborate closely with our product team and other engineers to integrate blockchain networks into our systems, develop and test on-chain logic for tokenized assets, and build tools that make interacting with those networks seamless. Bringing both initiative and deep technical expertise, you’ll play a key role in ensuring our blockchain integrations are robust, auditable, and ready to scale as adoption grows. You’ll be the key player in Ctrl Alt’s multi-chain architecture and help us to take our blockchain technology to the next level.

What you'll be doing

• Design and implement secure, auditable smart contract logic for tokenization, asset management, and governance

• Work with a queue-based architecture to create transactions, send them to the blockchain node, and manage the responses to keep track of the ledger

• Integrate blockchain and distributed ledger technologies into our backend systems

• Evaluate, test, and deploy blockchain logic on networks such as Cosmos, Liquid, and other Layer 1s

• Build tools for interacting with on-chain infrastructure (transaction monitoring, wallet integrations, etc.)

• Collaborate with product and engineering teams to deliver robust blockchain-based solutions for financial institutions

• Stay up to date on developments in blockchain infrastructure, standards, and regulatory frameworks

• Promote best practices in blockchain security and operational resilience

This role will be a great fit if you:

• 3+ years of software engineering experience, with at least 1+ years working with blockchain or distributed ledger technologies

• Experience using TypeScript/JavaScript to build integrations with blockchains

• Familiarising with a queue-based architecture

• Experience developing and deploying smart contract logic or similar on Layer 1 networks

• Familiarity with token standards and asset representation on-chain

• Understanding of cryptographic primitives (e.g. signatures, hashes, multisig) and transaction flows

• Experience integrating blockchain infrastructure into backend applications, ideally in a TypeScript/JavaScript based environment

• Knowledge of blockchain tools, APIs, and development environments (e.g. Cosmos SDK, Elements for Liquid, etc.

Nice to haves:

• Exposure to finance or fintech environments, particularly involving digital assets or tokenization

• Hands-on experience with Cosmos SDK, Liquid Network, or other modular blockchain frameworks

• Understanding of consensus mechanisms and interoperability protocols

• Familiarity with regulated tokenization platforms or compliance-first blockchain use cases

• Experience working with custodial and non-custodial wallet systems

• Strong communication skills for writing documentation and technical specs

Our Benefits

Join a scaling fintech building the next generation of investment banking. You’ll work at the intersection of capital markets and cutting-edge blockchain technology, helping drive and shape the future of financial infrastructure.

What it’s like working at Ctrl Alt

Build and own the future of finance

Take real responsibility in shaping digital capital markets, with the autonomy to lead decisions and drive impact.

Solve meaningful problems with exceptional people

Tackle complex challenges at the intersection of finance and technology alongside leaders with

experience from Morgan Stanley, Credit Suisse, UBS, and Revolut.

Grow fast in a high-performance environment

Stretch beyond your comfort zone through close collaboration, rapid feedback, and continuous learning.

Innovate and make your mark

Bring bold ideas to life and influence our platform, products, and how we operate from day one.

How we support you

• Competitive salaries with regular reviews that reflect your impact, performance, and progression.

• Generous stock options so you directly share in the company’s growth and long-term success.

• Premium private healthcare to support your physical wellbeing.

• 26 days of annual leave, plus your birthday off, and regional bank holidays - with flexible leave so you can take time off when you need it.

• An enhanced parental leave policy to support you and your family at every stage.

• A MacBook, screens, and any additional equipment you need to perform at a high level.

• Access to salary sacrifice schemes covering childcare, groceries, EV cars, tech, pensions, bikes, and subscriptions.

• Modern, centrally located offices in London, Belfast, Dundalk, and Dubai - designed for collaboration and focus.

• An annual learning and personal development budget for training, exams, certifications, and qualifications - whatever helps you move forward.