[Remote] Principal Software Engineer, DSP Integrations

Note: The job is a remote job and is open to candidates in USA. Fluency is a company focused on reshaping digital advertising through innovative solutions and a collaborative workplace culture. They are seeking a Principal Software Engineer, DSP Integrations to lead the architecture and execution of integrations with major Demand-Side Platforms, ensuring seamless operation and technical excellence in their automation platform.ResponsibilitiesArchitect Fluency's integrations with major Demand-Side Platforms (currently TTD, Amazon DSP, and Basis; expanding over time)Design and own partner API integrations (REST and GraphQL), including authentication, rate limits, retries, idempotency, reporting feeds, and webhook patternsEncode platform-specific operational semantics (campaign and ad group structure, targeting, budget behavior, bid strategies, attribution windows, learning-phase triggers) so that Fluency executes correctly on each DSPImplement cross-DSP capabilities including blueprint integration, reverse sync and forward mutate patterns, and object authority modelsPartner with DSPs at the engineering level, collaborating with partner-side technical contacts to unblock integration workSet technical direction and quality standards through architectural decisions, code, and design reviews, exercising influence rather than formal authorityTriage and resolve partner-integration defects and client-launch issues affecting campaign execution and reporting accuracySkills8+ years of software development experience, with a heavy focus on backend architecture and integration designDirect experience integrating with major DSPs as a consumer of their APIs (TTD, Amazon DSP, Basis, MSFT DSP, Yahoo DSP, StackAdapt, or equivalents). Hands-on knowledge of more than one is strongly preferredDeep experience working with partner APIs at scale: REST and GraphQL, authentication patterns, rate limits, retries, idempotency, reporting ingestion, and webhook handlingPractical understanding of DSP operational differences (budgeting, pacing, targeting, bid strategies, reporting), with a track record of encoding those differences correctly in integration logicProven proficiency with Java and Spring Boot, including event-driven services (e.g., Kafka)Knowledge of cloud infrastructure (AWS) and experience with distributed systems operating at high data volumeDistributed systems at walled-garden API volume. You have built high-throughput orchestration on top of partner APIs, with resilience under platform-side instability, and have the discipline to encode platform operational knowledge as structured, testable, continuously-updated capabilityAI-augmented production pipelines. You have built production systems where LLMs, deterministic rules, machine learning models, and purpose-built inference coexist, with work routed to the right layer based on cost, latency, and correctnessAI-augmented software development. You operate well in an AI-augmented engineering workflow: strong at specification, review, architectural decomposition, and judgment under ambiguity, and able to work productively at higher levels of abstractionComfort with high-volume integration workloads. Fluency operates at $3B+ annualized spend across 250,000+ monthly campaignsStrong bias toward ownership and impact in an environment with aggressive deadlines and externally committed delivery datesPassion for iterative development and continuous learningCompany OverviewFluency provides a digital advertising operating system that allows users to manage digital advertising campaigns across platforms. It was founded in 2017, and is headquartered in Burlington, Vermont, USA, with a workforce of 51-200 employees. Its website is https://www.fluency.inc.