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Valiant Harbor International
5.0
Software Development Engineer III (SDE III)
United States
Participate actively in design reviews, mentor other engineers, communicate technical decision clearly to both engineers and non-engineers.…
30d+
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Valiant Harbor International
5.0
Software Development Engineer III - Infrastructure (SDE III)
United States
Bachelor's or Master's in Computer Science, Software Engineering, or related field, or equivalent practical experience. This is a full-time, remote position.…
30d+
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Optimum
2.9
Software Development Engineer III
Plano, TX
$134K - $220K (Employer provided)
Easy Apply
Use prototypes and proof of concepts as the primary tools for deep and detailed explorations of architecture and software designs.…
30d+
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GM Financial
3.8
Software Development Engineer III
Arlington, TX
$95K - $125K (Glassdoor est.)
Bachelor’s Degree in Computer Science or related Engineering field; and/or commensurate experience preferred. What We Offer: Generous benefits package available……
30d+
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GM Financial
3.8
Software Development Engineer III - Digital Payments (C#/.NET)
Irving, TX
$68K - $105K (Glassdoor est.)
You’ll collaborate closely with product managers, architects, and cross-functional engineering teams to design and implement APIs, backend systems, and……
30d+
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WEX
3.4
Software Development Engineer III – AI & Agentic Systems
Portland, ME
$122K - $146K (Employer provided)
Agentic Workflows: Design and deploy multi-agent workflows within AWS Agent Core, effectively handling state management, memory persistence, and complex tool……
11d
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Braille Works
3.9
Software Development Engineer III (SDE III) Tech Lead
Seffner, FL
$100K (Employer provided)
Easy Apply
This is a hands-on engineering role with active contribution to design, implementation, and technical problem-solving. Within the first 30 days, this role will:…
30d+
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Premera Blue Cross
3.0
Software Development Engineer III
Mountlake Terrace, WA
$112K - $190K (Employer provided)
Analyze moderate to high‑risk business and technical requirements, design solution alternatives, and contribute to technical decision‑making across platforms……
30d+
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Strategic Analysis
4.1
Senior Software Development Engineer III - Backend Infrastructure & Agentic AI Platforms (#26-072)
United States
Easy Apply
Education: Bachelor's or master's degree in computer science, Software Engineering, or a related field, or equivalent practical experience.…
30d+
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Amazon
3.5
Software Development Engineer III, Platform Matching Systems and Policies (IAPP)
Seattle, WA
$168K - $227K (Employer provided)
As a Senior SDE on the team, you will own the design and delivery of large-scale systems that power product identity and matching.…
14d
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Amazon
3.5
Sr. Software Development Engineer, Data Center Design Engineering - BIM & AI Technologies
Seattle, WA
$168K - $227K (Employer provided)
You will define the technical vision and roadmap for AI-native design automation, balancing innovation with practical implementation while ensuring alignment……
7d
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Amazon Web Services
3.6
Software Development Engineer III, Annapurna Labs
United States
$185K - $250K (Employer provided)
5+ years of leading design or architecture (design patterns, reliability and scaling) of new and existing systems experience. A day in the life.…
30d+
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Radiant Industries
3.9
Supply Chain Manager
El Segundo, CA
$86K - $168K (Employer provided)
Easy Apply
Bachelor’s degree in Supply Chain Management, Business Administration, Engineering, or a related field. Cost Analysis & Optimization: Analyze market trends,……
30d+
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Amazon
3.5
Senior Robotics SDE III, Amazon Robotics - Vulcan
Seattle, WA
$168K - $227K (Employer provided)
You will drive the creation of new tools and pipelines to develop, deploy, and understand the performance of complex item manipulation policies in the messy……
19d
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Amazon
3.5
Software Development Engineer III, Unified Intelligent Matching Systems (UIMS)
Sunnyvale, CA
$193K - $262K (Employer provided)
As a Senior SDE on the PRISM team, you will own the design and delivery of large-scale systems that power product identity and matching.…
21d
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Amazon
3.5
Senior Software Development Engineer, Autonomous AI Security
Austin, TX
$168K - $227K (Employer provided)
Architect, design, and develop AI/ML-driven security automation systems to detect and mitigate threats at scale.…
15d
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Amazon
3.5
Senior Software Development Engineer, Sponsored Products and Brands
New York, NY
$185K - $250K (Employer provided)
5+ years of leading design or architecture (design patterns, reliability and scaling) of new and existing systems experience.…
30d+
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Amazon Web Services
3.6
Sr Embedded SDE III, Hardware Engineering Services
Cupertino, CA
$193K - $262K (Employer provided)
5+ years of leading design or architecture (design patterns, reliability and scaling) of new and existing systems experience.…
27d
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Amazon Web Services
3.6
AWS FSx Lustre - SDE III, AWS FSx Lustre
Boston, MA
$168K - $227K (Employer provided)
5+ years of leading design or architecture (design patterns, reliability and scaling) of new and existing systems experience. Mentor and grow junior engineers.…
14d
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Amazon
3.5
Senior Software Development Engineer, FLY Capacity Manager
Bellevue, WA
$168K - $227K (Employer provided)
You'll set the technical bar for the team — defining best practices, mentoring engineers, and making high-judgment calls on architecture, scalability, and……
30d+
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Amazon
3.5
Sr. Software Dev Engineer, Production and Post Production Technology
Culver City, CA
$168K - $227K (Employer provided)
Communicate technical designs and decisions effectively in writing for technical audiences, creating architecture documents, design proposals, and technical……
30d+
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Valiant Harbor International

5.0

Software Development Engineer III (SDE III)

United States

Is your resume a good match?

Use AI to find out how well the skills on your resume fit this job description.

Valiant Harbor International is seeking a Software Development Engineer III (SDE III) to support the Director’s Office at the Advanced Research Projects Agency for Health (ARPA-H). This candidate will contribute to the General Research Assistant and Content Engine (GRACE) development team in building the next generation of agentic AI to transform how ARPA-H Program Managers accelerate research, make decisions, and ship products at scale. GRACE is ARPA-H’s production AI assistant, and ARPA-H’s intention is to evolve it into an ecosystem of autonomous, multi-agent systems. This is a full-time, remote position. The candidate must be able to travel within the U.S.

Key Responsibilities:

Design and build agentic AI systems and orchestration:
- Design and build GRACE's core agentic workflows (e.g., multi-step reasoning, planning, memory, and tool-use across single and multi-agent systems).
- Implement and evolve A2A communication patterns at the application layer, enabling GRACE agents to collaborate and hand off tasks.
- Build and maintain the tool-calling layer (tool definitions, input/output schemas, error handling, retry logic, and result formatting).
- Manage the MCP client-side integration.
- Design multi-agent workflows that are reliable, observable, and debuggable in production.
Facilitate LLM application development:
- Own LLM orchestration at the application layer (prompt construction, context management, model selection logic, and response parsing).
- Build and maintain RAG features (query formulation, result ranking, citation grounding, and hallucination mitigation).
- Implement and iterate on prompt engineering patterns and system prompts across OpenAI GPT, Anthropic Claude, and Google Gemini.
- Manage context window budgets (truncate, summarize, paginate, etc.) and build the logic that makes those decisions correctly.
- Build evaluation pipelines for LLM quality (grounding assessment, regression testing, safety checks, and A/B experimentation on prompt and model changes).
- Manage prompts and pipelines that are cost-efficient without sacrificing output quality.
Manage features and products:
- Translate ambiguous product requirements into clear technical designs for fast shipment.
- Build new GRACE capabilities end-to-end (from backend application logic through to the API contract the frontend).
- Rapidly prototype new agentic features, run experiments, collect data, and iterate based on real user behavior.
- Perform oversight and quality assessments; write tests, handle edge cases, and make sure your features degrade gracefully when upstream dependencies fail.
Manage reliability and collaboration with internal/external partners:
- Instrument agentic workflows with tracing, logging, and metrics so failures are diagnosable and regressions are caught before users report them.
- Define and monitor application-level SLOs: tool call success rates, response quality, and latency from the user's perspective.
- Build fallback and guardrail logic for AI services.
- Write production-quality code: readable, tested, reviewed, and documented.
- Work closely with the infra engineer to understand system-level constraints and design application behavior that respects them.
- Participate actively in design reviews, mentor other engineers, communicate technical decision clearly to both engineers and non-engineers.

Required Qualifications:

Bachelor's or Master's in Computer Science, Software Engineering, or related field, or equivalent practical experience.
7+ years of professional software engineering experience building and operating production systems.
Proven experience in high-velocity environments shipping complex products end-to-end.
Strong proficiency in Python and at least one other backend language; familiarity with modern backend frameworks and async patterns.
Solid understanding of algorithms, data structures, APIs, and software design patterns.
Experience building and operating systems on major cloud platforms (AWS, GCP, or Azure).
Experience with containerization and working within CI/CD pipelines.
Self-starter with a high bar and high sense of urgency; you do not wait to be told what to do next.

Preferred Qualifications:

Hands-on experience building production systems on top of LLMs: tool-calling, RAG, multi-step reasoning, and context management.
Experience with multi-agent (A2A) architectures and orchestration frameworks in production.
Familiarity with MCP at the client/consumer layer: how agents discover and invoke tools via MCP.
Strong intuition for prompt engineering and LLM behavior across model families.
Experience building LLM evaluation and regression testing pipelines.
Cost-per-query awareness, context budget management, and prompt efficiency.
Track record in startup or early-stage environments: 0-to-1 product building, comfort with ambiguity, high sense of urgency.
Experience in big tech building customer-facing AI platforms or developer tools at scale.
Background in security-conscious engineering (input validation, output sanitization, audit logging, and responsible AI guardrails).

Salary Range: Negotiable

EEO Statement: Valiant Harbor International, LLC is an Equal Opportunity/Affirmative Action employer. Valiant Harbor International prohibits discrimination with respect to the hiring or promotion of individuals, conditions of employment, disciplinary and discharge practices, or any other aspect of employment on the basis of sex, race, color, age, national origin, religion, disability, marital status, sexual orientation, gender identity, pregnancy, veteran status, or any other protected class. If you are an individual with a disability and require a reasonable accommodation to complete any part of the application process, or are limited in the ability or unable to access or use this online application process and need an alternative method for applying, you may contact (202) 417-6705 for assistance.

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5.0

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Valiant Harbor International

5.0

Software Development Engineer III (SDE III)

United States

Valiant Harbor International

5.0

Software Development Engineer III (SDE III)

United States

Is your resume a good match?

Use AI to find out how well the skills on your resume fit this job description.

Design and build agentic AI systems and orchestration:
- Design and build GRACE's core agentic workflows (e.g., multi-step reasoning, planning, memory, and tool-use across single and multi-agent systems).
- Implement and evolve A2A communication patterns at the application layer, enabling GRACE agents to collaborate and hand off tasks.
- Build and maintain the tool-calling layer (tool definitions, input/output schemas, error handling, retry logic, and result formatting).
- Manage the MCP client-side integration.
- Design multi-agent workflows that are reliable, observable, and debuggable in production.
Facilitate LLM application development:
- Own LLM orchestration at the application layer (prompt construction, context management, model selection logic, and response parsing).
- Build and maintain RAG features (query formulation, result ranking, citation grounding, and hallucination mitigation).
- Implement and iterate on prompt engineering patterns and system prompts across OpenAI GPT, Anthropic Claude, and Google Gemini.
- Manage context window budgets (truncate, summarize, paginate, etc.) and build the logic that makes those decisions correctly.
- Build evaluation pipelines for LLM quality (grounding assessment, regression testing, safety checks, and A/B experimentation on prompt and model changes).
- Manage prompts and pipelines that are cost-efficient without sacrificing output quality.
Manage features and products:
- Translate ambiguous product requirements into clear technical designs for fast shipment.
- Build new GRACE capabilities end-to-end (from backend application logic through to the API contract the frontend).
- Rapidly prototype new agentic features, run experiments, collect data, and iterate based on real user behavior.
- Perform oversight and quality assessments; write tests, handle edge cases, and make sure your features degrade gracefully when upstream dependencies fail.
Manage reliability and collaboration with internal/external partners:
- Instrument agentic workflows with tracing, logging, and metrics so failures are diagnosable and regressions are caught before users report them.
- Define and monitor application-level SLOs: tool call success rates, response quality, and latency from the user's perspective.
- Build fallback and guardrail logic for AI services.
- Write production-quality code: readable, tested, reviewed, and documented.
- Work closely with the infra engineer to understand system-level constraints and design application behavior that respects them.
- Participate actively in design reviews, mentor other engineers, communicate technical decision clearly to both engineers and non-engineers.

Required Qualifications:

Bachelor's or Master's in Computer Science, Software Engineering, or related field, or equivalent practical experience.
7+ years of professional software engineering experience building and operating production systems.
Proven experience in high-velocity environments shipping complex products end-to-end.
Strong proficiency in Python and at least one other backend language; familiarity with modern backend frameworks and async patterns.
Solid understanding of algorithms, data structures, APIs, and software design patterns.
Experience building and operating systems on major cloud platforms (AWS, GCP, or Azure).
Experience with containerization and working within CI/CD pipelines.
Self-starter with a high bar and high sense of urgency; you do not wait to be told what to do next.

Preferred Qualifications:

Hands-on experience building production systems on top of LLMs: tool-calling, RAG, multi-step reasoning, and context management.
Experience with multi-agent (A2A) architectures and orchestration frameworks in production.
Familiarity with MCP at the client/consumer layer: how agents discover and invoke tools via MCP.
Strong intuition for prompt engineering and LLM behavior across model families.
Experience building LLM evaluation and regression testing pipelines.
Cost-per-query awareness, context budget management, and prompt efficiency.
Track record in startup or early-stage environments: 0-to-1 product building, comfort with ambiguity, high sense of urgency.
Experience in big tech building customer-facing AI platforms or developer tools at scale.
Background in security-conscious engineering (input validation, output sanitization, audit logging, and responsible AI guardrails).

Salary Range: Negotiable

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Working here doesn’t have to be a secret

5.0

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CEO: 1 Ratings

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28 Software development engineer sde iii jobs in United States

Working here doesn’t have to be a secret

Working here doesn’t have to be a secret