• Work at DaCodes! We are a high-impact software and digital transformation firm. • For over 10 years, we have built technology-driven solutions powered by innovation, thanks to our team of nearly 300 talented #DaCoders. • You’ll have the opportunity to accelerate your professional growth, work on diverse projects across multiple industries, and contribute to the design, implementation, and optimization of cloud-based infrastructures. • As a Senior API Engineer (.NET, GraphQL), you will take full ownership of mission-critical APIs, designing, building, and operating high-performance, scalable GraphQL and backend services running in production on Microsoft Azure. • You will be accountable for API performance, reliability, scalability, and long-term maintainability, working closely with product, platform, and DevOps teams to ensure APIs support real business needs at scale.

• Own the architecture and technical vision for Blockstream’s platform and shared services • Design scalable, secure, and fault-tolerant distributed systems supporting Bitcoin, Layer-2, and enterprise products • Define platform standards for APIs, data models, service boundaries, and infrastructure patterns • Partner with engineering teams to guide implementation, review designs, and resolve complex technical challenges • Collaborate with Security and Infrastructure teams to ensure defense-in-depth, key management, and operational resilience • Evaluate and introduce new technologies while balancing innovation with operational maturity • Ensure platform designs support regulatory, enterprise, and institutional requirements without compromising decentralization principles • Document architectural decisions, tradeoffs, and long-term technical roadmaps • Mentor senior engineers and help raise the overall architectural rigor across teams

• Analyze and solve interesting business and technical challenges. You’ll dive deep into complex problems, using your experience to find elegant solutions that keep our systems running smoothly. • Develop software architecture that stands the test of scale and time. We aren’t just building for today; you’ll design robust, sustainable systems that grow alongside our customers. • Champion our customers at every turn. By approaching every architectural solution with empathy, you’ll ensure that the work we do directly improves the financial lives of the people we serve. • Collaborate and lead with heart. You’ll partner closely with your manager and teammates to set priorities, helping us decide which new features, infrastructure improvements, and tools will have the biggest impact. • Be a mentor and a guide. You’ll have the opportunity to support junior engineers through shorter projects, sharing your knowledge and helping them grow their technical skills and careers. • Bridge the gap between tech and business. You’ll talk to people across the company, acting as a friendly expert who can explain complex backend concepts and help align our technical work with our big-picture mission.

• Design, develop, test, and maintain high-quality Python-based applications and services • Build scalable backend systems, APIs, and data-processing solutions using Python • Collaborate with product managers, architects, and front-end engineers to translate business requirements into technical solutions • Optimize application performance, reliability, and scalability through code reviews and refactoring • Write clean, reusable, and well-documented code following best practices and coding standards • Troubleshoot, debug, and resolve production issues in a timely manner • Participate in system design discussions, technical planning, and architecture reviews • Mentor junior developers and contribute to knowledge sharing within the team • Stay updated with the latest Python frameworks, libraries, and industry trends.