Senior Software Engineer - NewMarkets Japan

About the role

Alpaca is a US-headquartered self-clearing broker-dealer and brokerage infrastructure for stocks, ETFs, options, crypto, fixed income, 24/5 trading, and more. Our recent Series D funding round brought our total investment to over $320 million, fueling our ambitious vision. Amongst our subsidiaries, Alpaca is a licensed financial services company, serving hundreds of financial institutions across 40 countries with our institutional-grade APIs. This includes broker-dealers, investment advisors, wealth managers, hedge funds, and crypto exchanges, totalling over 9 million brokerage accounts. Our global team is a diverse group of experienced engineers, traders, and brokerage professionals who are working to achieve our mission of opening financial services to everyone on the planet . We're deeply committed to open-source contributions and fostering a vibrant community, continuously enhancing our award-winning, developer-friendly API and the robust infrastructure behind it. Alpaca is proudly backed by top-tier global investors, including Portage Ventures, Spark Capital, Tribe Capital, Social Leverage, Horizons Ventures, Unbound, SBI Group, Derayah Financial, Elefund, and Y Combinator. Our Team Members: We're a dynamic team of 230+ globally distributed members who thrive working from our favorite places around the world, with teammates spanning the USA, Canada, Japan, Hungary, Nigeria, Brazil, the UK, and beyond! We're searching for passionate individuals eager to contribute to Alpaca's rapid growth. If you align with our core values-Stay Curious, Have Empathy, and Be Accountable-and are ready to make a significant impact, we encourage you to apply. Your Role: As a Senior Engineer, we want you to be responsible for designing, implementing, and maintaining the systems and services that form Alpaca's foundation and empower millions of users who trade billions of dollars worth of assets. We will look to you to contribute to regional recruitment initiatives, help drive cross-functional team projects, mentor teammates with respect to our engineering principles and practices, and foster Alpaca culture in the Japan region. We expect you to participate in operational reliability engineering during regional business hours, helping to ensure proactive 24x7 stability of our platform. For this role, we are seeking an experienced backend engineer who is dedicated to delivering seamless and high-quality software solutions. The ideal candidate has a proven track record of designing and building scalable applications, is comfortable challenging conventions and advocating for innovative solutions, and can bridge engineering work with Japan-specific regulatory, vendor, and partner requirements. In this position, we would like you to have the autonomy to architect and implement solutions that meet our strategic objectives while also actively contributing to the goal-setting process alongside a collaborative, cross-functional team. Things You Get To Do: Design highly scalable, mission-critical brokerage systems for the Japan market. Develop and enhance the middle- and back-office systems, including gRPC microservices, REST and gRPC APIs, and third-party vendor integrations specific to the Japan market (e.g. JPX , JSCC , JASDEC , banks, identity verification vendors). Work closely with Alpaca's core teams to enhance and transform the core framework, enabling support for multiple languages, currencies, and markets, with a particular focus on Japan-specific requirements such as NISA , MyNumber, withholding tax, and JP-GAAP accounting. Collaborate with tech leads in other regions both synchronously and asynchronously, primarily through Slack and meetings, to align with global teams. Coordinate in Japanese with local regulators, vendors, partners, and business stakeholders, and translate those requirements into technical specifications for the global engineering team. Troubleshoot incidents and reported bugs to maintain system integrity and performance. Participate in on-call rotations and assist with timely engineering projects and production issues during Japan business hours. Thrive in a global environment, effectively navigating regulatory requirements and building scalable solutions to support Alpaca's expansion in Japan. Who You Are (Must-Haves): Native or JLPT N1 level fluency in Japanese, with the ability to read, write, and communicate professionally with local regulators, vendors, and partners. Business-level English fluency, with the ability to collaborate effectively in English-only team meetings, design discussions, code reviews, and written documentation. Proven experience in designing and developing complex financial systems, preferably including double-entry accounting. Strong understanding of accounting principles, ledger structures, and transaction reconciliation. Experience in building scalable, high-availability financial applications that handle multi-currency transactions. Famili