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Join a startup on the way up — not a bet, not a giant.

Tech roles at Series A–C companies backed by Sequoia, a16z, Benchmark & other top-tier VCs

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  • Founders Fund
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Open roles

High-signal tech roles at Series A–C companies, refreshed as boards update.

20 results on this page
Jobs per page
PreviousPage 35Next
Pacific Fusion logo
Senior Target Fabrication Engineer - Assembly
1/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$175,900 - $263,800
Onsite
20 results on this page
Jobs per page
PreviousPage 35Next
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
GD&T
Posted 2 weeks agoSee job

Pacific Fusion seeks a Senior Target Fabrication Engineer to lead precision assembly and project management for fusion targets, bridging design and physical realization to deliver high-precision assemblies on schedule.

Pacific Fusion logo
Senior Buyer
2/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$125,000 - $150,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Coupa
NetSuite
SAP
Posted 2 weeks agoSee job

Pacific Fusion seeks a Senior Buyer to support sourcing and delivery of components for a fusion demonstration system. The role involves negotiating with suppliers, managing performance, and implementing procurement strategies to ensure timely and budget-conscious delivery.

Pacific Fusion logo
Senior Controls Infrastructure Engineer
3/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$138,100 - $207,100
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Firewalls
Infrastructure as Code
NIST SP 800-171
Zero Trust Architecture
Posted 2 weeks agoSee job

Pacific Fusion seeks a Senior Controls Infrastructure Engineer to design, deploy, and operate network, storage, and compute infrastructure for its 24/7 fusion facility. The role demands expertise in network segmentation, Zero Trust, NIST compliance, and leading infrastructure projects in a regulated environment.

Pacific Fusion logo
Facilities Technician
4/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$46.3 - $69.42
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD Software Proficiency
CNC Machining
HVAC
Machining
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Facilities Technician to support engineering and operations by installing and maintaining equipment, managing facilities, and assisting with test stands. The role requires 5+ years of hands-on experience and involves both mechanical and electrical tasks.

Pacific Fusion logo
Mechanical Engineer - Pulsed Power
5/20Posted 2 weeks ago

Pacific Fusion · Fremont, Alameda County, California

$115,000 - $150,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
ANSYS
Control Systems
MATLAB
PSCAD
+2 more
Posted 2 weeks agoSee job

Pacific Fusion is seeking a highly motivated Mechanical Engineer to design, build, operate, and advance pulsed power systems for its inertial fusion platform. This role involves high-voltage systems, controls, diagnostics, and data analysis, with responsibilities spanning design, testing, and system improvement.

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Pacific Fusion logo
Senior Mechanical Engineer
6/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$156,500 - $234,800
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD
Creo
DFM/DFA (Design for Manufacturability & Assembly)
Finite Element Analysis
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Mechanical Engineer to lead the design, development, and validation of mechanical components for advanced fusion energy systems. The role involves structural analysis, design reviews, and collaboration with multidisciplinary teams. Requires 6+ years of experience and proficiency in CAD (Creo), FEA, and CFD.

Pacific Fusion logo
Senior Full Stack Developer
7/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$138,000 - $207,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Apache Kafka
CI/CD
Figma
Go (Golang)
+6 more
Posted 2 weeks agoSee job

Pacific Fusion is hiring a Senior Full Stack Developer to architect and develop data acquisition systems and web front ends for their inertial fusion energy systems. The role involves building full-stack applications, databases, and APIs to support the pulser factory and Demonstration System. Requires 7+ years of experience with React and backend development.

Pacific Fusion logo
Senior Mechanical Engineer - Pulser Modules
8/20Posted 2 weeks ago

Pacific Fusion · Fremont, Alameda County, California

$138,100 - $263,800
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD
Creo
Finite Element Analysis
SolidWorks
Posted 2 weeks agoSee job

Pacific Fusion seeks a Senior Mechanical Engineer to design, analyze, and validate mechanical systems for its fusion energy platform. The role involves leading design projects, mentoring junior engineers, and collaborating with multidisciplinary teams to advance commercial fusion energy.

Pacific Fusion logo
Senior Mechanical Design Specialist
9/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$138,100 - $207,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD
Creo Parametric
Finite Element Analysis
GD&T
+1 more
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Mechanical Design Specialist to develop advanced mechanical systems for next-generation fusion energy technology. This hands-on role involves CAD design, analysis, and technical leadership, contributing to the mission of providing abundant, affordable, clean energy.

Pacific Fusion logo
Senior Mechanical Engineer
10/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$138,100 - $263,800
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Additive Manufacturing
ANSYS
CAD
Creo
+3 more
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Mechanical Engineer to design, analyze, and integrate mechanical systems for a pulser-driven inertial fusion energy platform. This role involves end-to-end ownership of mechanical scope, FEA, CAD, and mentoring junior engineers.

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Pacific Fusion logo
Senior Project Engineer, Steel Structures
11/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$160,000 - $220,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Welding
Posted 2 weeks agoSee job

Pacific Fusion is hiring a Senior Project Engineer to lead the procurement, fabrication, and installation of structural steel systems for its inertial fusion facility. This role manages vendor scopes, schedules, and cross-functional coordination to deliver critical infrastructure.

Pacific Fusion logo
Senior Structures Engineer
12/20Posted 2 weeks ago

Pacific Fusion · Fremont, Alameda County, California

$156,500 - $234,800
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD
Creo
DFM/DFA (Design for Manufacturability & Assembly)
Finite Element Analysis
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Mechanical Engineer to lead the design, structural analysis, and integration of large structures for its fusion energy systems. The role involves mentoring junior engineers and driving development efforts, requiring 5+ years of experience and expertise in CAD and FEA.

Pacific Fusion logo
Senior Structures Engineer
13/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$175,900 - $265,800
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD Software Proficiency
GD&T
Mechanical Design
Structural Analysis
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Structures Engineer to design, analyze, and validate critical mechanical and structural systems for its fusion energy systems. The role involves temporary structures, seismic restraints, FEA, and collaboration with construction teams. Requires 10+ years of experience and expertise in ASME/OSHA codes.

Pacific Fusion logo
OBA Research Scientist/Engineer – Fusion Energy Systems
14/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$200,000 - $350,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
AI/ML
Control Systems
Posted 2 weeks agoSee job

Pacific Fusion seeks national laboratory scientists and engineers to participate in fusion energy R&D through the CHIPS Act OBA program. This role involves leading fusion energy projects, from target design to diagnostics, with flexible 5-40 hour weeks and competitive compensation.

Pacific Fusion logo
Infrastructure Mechanical Engineer
15/20Posted 2 weeks ago

Pacific Fusion · Albuquerque, Bernalillo County, New Mexico

$116,000 - $174,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
HVAC
Posted 2 weeks agoSee job

Pacific Fusion is seeking an Infrastructure Mechanical Engineer to oversee mechanical building systems for a nuclear fusion demonstration system. Based in Albuquerque, NM with travel to San Leandro, CA. Requires 7+ years experience in industrial/research facility systems.

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Pacific Fusion logo
Facilities Engineer
16/20Posted 2 weeks ago

Pacific Fusion · Albuquerque, Bernalillo County, New Mexico

$120,000 - $170,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Posted 2 weeks agoSee job

Pacific Fusion seeks a Senior Facilities Engineer to act as the technical bridge between the fusion demonstration system design team and facility infrastructure, overseeing integration of complex M&E systems. Based in Albuquerque, NM with travel to San Leandro, CA, this role requires 10+ years of experience in large-scale industrial or scientific research facilities.

Pacific Fusion logo
Senior Security Engineer
17/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$150,000 - $200,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Encryption
Endpoint Security
Identity and Access Management
ISO 27001
+11 more
Posted 2 weeks agoSee job

Pacific Fusion is hiring a Senior Security Engineer to implement and maintain security controls across IT, SaaS, and endpoints. The role focuses on MDM, endpoint security, and compliance (NIST, SOC 2, ISO 27001). Requires 5+ years of experience.

Pacific Fusion logo
Controls Hardware Engineer
18/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$138,100 - $207,100
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
CAD
Posted 2 weeks agoSee job

Pacific Fusion is hiring a Controls Hardware Engineer to design and implement control system hardware for its inertial fusion system. The role involves gathering requirements, designing control architectures, and working with PLCs, VFDs, and safety systems.

Pacific Fusion logo
Storytelling Lead
19/20Posted 2 weeks ago

Pacific Fusion · San Leandro, Alameda County, California

$160,000 - $190,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
Posted 2 weeks agoSee job

Pacific Fusion is hiring a Storytelling Lead to shape the narrative around its inertial fusion energy technology. This senior writer will turn complex technical work into clear, credible stories, working with executives and scientists to communicate progress and mission.

Pacific Fusion logo
Senior Mechanical Engineer - Pulsed Power
20/20Posted 2 weeks ago

Pacific Fusion · Fremont, Alameda County, California

$140,000 - $200,000
Onsite
Series A
Funded 2 yr ago
$1B-$10B
General Catalyst
Lightspeed Venture Partners
ANSYS
Control Systems
Data Analysis
MATLAB
+3 more
Posted 2 weeks agoSee job

Pacific Fusion is seeking a Senior Mechanical Engineer to design, build, and operate pulsed power systems for its inertial fusion platform. This hands-on role involves high-voltage systems, controls, diagnostics, and data analysis, with a focus on advancing the core experimental platform.

Daily job alert

Get new VC-backed tech jobs in your inbox every morning.

Narrow your alert

Free daily email. Confirm via link to activate. Unsubscribe anytime.