Block

1 month ago

Principal Engineer, AI Systems

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI

Last checked: 3 hours agoStatus: Live

Job Summary

Lead the development of autonomous agents and agentic workflows at scale, architecting orchestration, integration of frontier LLMs, and production-grade AI systems that empower Block’s ecosystem with reliable, maintainable, and high-performance solutions.

Location: San Francisco

Workplace: Remote

Employment Type: Full time

Job Function: Data Science & Machine Learning

Seniority: Sr. Manager level

Key Responsibilities

•Ship, architect, build, and own end-to-end delivery of autonomous agents and agentic workflows that deliver real business value for Block, ensuring reliability, safety, and performance at scale
•Design agent orchestration systems including planning, tool use, memory, evaluation, and multi-agent coordination at production scale
•Integrate and optimize frontier LLMs into agent architectures, making decisions on model selection, fine-tuning, prompt engineering, and context retrieval strategies
•Drive deeper model optimization work (fine-tuning, distillation, RLHF) where it unlocks agent capability or efficiency
•Lead detailed technical planning by breaking down ambitious objectives into concrete, sequenced tasks with clear ownership and execution paths

Pay and Benefits

Perks:Remote WorkHealth InsuranceRetirement Savings

Key Requirements

•15+ years of experience in software engineering or machine learning, with recent professional experience building autonomous agents or agentic workflows in production
•Deep experience building autonomous agents or agentic workflows in production environments—not just prototypes or demos
•Fluency in the core primitives of agentic systems: context management, planning, tool use, memory, evaluation, and multi-step reasoning
•Experience bringing frontier LLM capabilities into production products, with hands-on experience in prompt engineering, retrieval-augmented generation, and model optimization
•A track record of taking AI-powered products from zero to scale in fast-paced, product-driven environments, with the judgment that comes from operating in production

Experience:15+ yearsArtificial IntelligenceSoftware

Skills:LeadershipCommunicationMentoringCollaborationProblem-solving

Languages:English

Tech Stack:PythonLLMRLHFPrompt engineeringRetrieval-augmented generationFine-tuningDistillation

Company Brief

Block

Builds financial services and commerce tools to empower businesses and individuals, operating products such as Square, Cash App, Spiral (Bitcoin initiatives), TIDAL, and developer-focused payment and banking solutions.

Industry: Fintech Infrastructure

Company Size: Enterprise (1,001+ employees)

Revenue: USD 1B+

Growth: Public Company

Valuation: Public Company (Market Cap in USD)

Funding: IPO / Publicly Listed

Headquarters: San Francisco, United States

Founded: 2009

Website LinkedIn

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Block

1 month ago

Principal Engineer, AI Systems

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI

Last checked: 3 hours agoStatus: Live

Job Summary

Location: San Francisco

Workplace: Remote

Employment Type: Full time

Job Function: Data Science & Machine Learning

Seniority: Sr. Manager level

Key Responsibilities

•Ship, architect, build, and own end-to-end delivery of autonomous agents and agentic workflows that deliver real business value for Block, ensuring reliability, safety, and performance at scale
•Design agent orchestration systems including planning, tool use, memory, evaluation, and multi-agent coordination at production scale
•Integrate and optimize frontier LLMs into agent architectures, making decisions on model selection, fine-tuning, prompt engineering, and context retrieval strategies
•Drive deeper model optimization work (fine-tuning, distillation, RLHF) where it unlocks agent capability or efficiency
•Lead detailed technical planning by breaking down ambitious objectives into concrete, sequenced tasks with clear ownership and execution paths

Pay and Benefits

Perks:Remote WorkHealth InsuranceRetirement Savings

Key Requirements

•15+ years of experience in software engineering or machine learning, with recent professional experience building autonomous agents or agentic workflows in production
•Deep experience building autonomous agents or agentic workflows in production environments—not just prototypes or demos
•Fluency in the core primitives of agentic systems: context management, planning, tool use, memory, evaluation, and multi-step reasoning
•Experience bringing frontier LLM capabilities into production products, with hands-on experience in prompt engineering, retrieval-augmented generation, and model optimization
•A track record of taking AI-powered products from zero to scale in fast-paced, product-driven environments, with the judgment that comes from operating in production

Experience:15+ yearsArtificial IntelligenceSoftware

Skills:LeadershipCommunicationMentoringCollaborationProblem-solving

Languages:English

Tech Stack:PythonLLMRLHFPrompt engineeringRetrieval-augmented generationFine-tuningDistillation

Company Brief

Block

Industry: Fintech Infrastructure

Company Size: Enterprise (1,001+ employees)

Revenue: USD 1B+

Growth: Public Company

Valuation: Public Company (Market Cap in USD)

Funding: IPO / Publicly Listed

Headquarters: San Francisco, United States

Founded: 2009

Website LinkedIn