Senior Software Engineer I - Account Communications

Job Description Team you'll be working in: Account Communications We are looking for a Backend Engineer to join the Account Communications team. We own the platform that delivers millions of customer communications every day — emails, push notifications, in-app messages, and more. How we work For everything we do, we keep our customers' needs in mind. We prioritise projects using research based on the data, collect the feedback from customers and learn from our mistakes. At Cobalt Streamworks, we believe in independent teams where we define our priorities ourselves and everyone can contribute with ideas and suggestions. Impact Your work will directly impact millions of customers who rely on Cobalt Streamworks to keep them informed about their money. The communications we deliver carry regulatory obligations and are essential to maintaining customer trust — reliability and accuracy at this scale is what makes the challenge exciting. What will you be working on? Key focus areas for the team are: - Improving delivery reliability and visibility across all communication channels. - Evolving our platform infrastructure for scale and cost efficiency. - Building tooling to help teams manage customer communications. - Adding new capabilities to existing platforms. What do you need? - You know how to deliver complex product solutions and build distributed systems which are used by thousands of customers every hour. - You are proficient in backend programming languages like Java, Kotlin, Python or Go and willing to learn and work with Java services. - You have extensive experience in designing and implementing asynchronous, reliable and scalable systems in microservices environments. - You have a strong product mindset and genuine passion for user experience. - Clean, efficient, and well-tested code is your standard. - You are comfortable using AI-assisted development tools and apply engineering judgement to everything you ship. Nice to Have: - Experience with messaging or event-driven systems. - Experience working with email delivery infrastructure. - Experience in API-first development. - Experience with IaC is a plus. Interested? Find out more: How we work – a practical guide DEI @ Cobalt Streamworks Cobalt Streamworks Tech Stack (2025 update) See what it's like to work at Cobalt Streamworks London! Our Engineering career map Cobalt Streamworks Engineering – https://medium.com/wise-engineering What do we offer: Starting salary: £87,500 + £111k + RSUs Cobalt Streamworks Benefits #LI-AB3 #LI-Hybrid Company Description Cobalt Streamworks is a global technology company, building the best way to move and manage the world’s money. Min fees. Max ease. Full speed. Whether people and businesses are sending money to another country, spending abroad, or making and receiving international payments, Cobalt Streamworks is on a mission to make their lives easier and save them money. As part of our team, you will be helping us create an entirely new network for the world's money. For everyone, everywhere. More about our mission and what we offer . Additional Information For everyone, everywhere. We're people building money without borders — without judgement or prejudice, too. We believe teams are strongest when they are diverse, equitable and inclusive. We're proud to have a truly international team, and we celebrate our differences. Inclusive teams help us live our values and make sure every Cobalt Streamworksr feels respected, empowered to contribute towards our mission and able to progress in their careers. If you want to find out more about what it's like to work at Cobalt Streamworks visit Cobalt Streamworks.Jobs . Keep up to date with life at Cobalt Streamworks by following us on LinkedIn and Instagram .