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Retro Biosciences

Develops aging-focused therapeutics across programs.

Research Technician - Tissue processing and cell culture

Full-Time
$75k - $95k/yr
Entry
San Carlos, CA, USA
In Person
Biology & BiotechTranslational Research & Bench Biology

About the job

Requirements
  • You're reliable and organized and skilled at hands-on, time-sensitive lab work.
  • You're comfortable with mouse tissues and meticulous about labeling, timing, and records.
  • You're collaborative and easy-going; you communicate proactively, and you bring a positive attitude to a fast-moving environment.
  • You like being the person a team can count on to be consistent and you also understand that routines can always be improved.
Responsibilities
  • Own execution of day-to-day isolation of immune cells from animal tissues — blood, bones, and spleen — giving you a direct view into engraftment results.
  • Coordinate closely with the in vivo team so material for preclinical studies are handled promptly and correctly.
  • Support media preparation, media changes, and cell culture maintenance for iPSC/iHSC differentiation workflows, including weekend coverage as part of a team rotation.
  • Assist with sample prep and handoff for downstream assays, including flow cytometry.
  • Help store and organize large datasets from readouts, coordinating with the compbio team.
  • Maintain accurate sample labels, culture logs, inventory, and reagent tracking.
  • Contribute to SOPs and process improvements as you take ownership of the workflow.
  • Help keep a clean, organized cell-culture work area.
Desired Qualifications
  • Processing primary samples - blood, bone marrow, spleen, or similar.
  • Culturing iPSC and/or primary HSC cells.
  • Analyzing cell composition using flow cytometry, including operation of a CytoFLEX.
  • Performing antibody staining and preparing immune or hematopoietic samples for flow cytometry; experience developing or optimizing staining panels is a plus.
  • Managing and organizing large sample datasets (750+ samples) ensuring sample traceability.
  • Experience working in a lab environment in an academic or industry setting is listed as desirable.
  • Comfortable working with mouse tissues.
  • Basic mammalian cell culture experience.
  • Strong organizational and reliability traits with high attention to detail.
  • Ability to execute repetitive, schedule-sensitive workflows consistently and carefully.
  • Follow SOPs and checklists while flagging issues and ideas quickly.

About the company

Retro Biosciences develops therapeutics aimed at extending healthy human lifespan by addressing the cellular drivers of aging. The company runs three main programs—cellular reprogramming, plasma-inspired therapeutics, and autophagy—supported by single-cell multi-omics, computational biology, and lab automation to build a pipeline that targets aging mechanisms to prevent multiple age-related diseases. Revenue comes from developing and commercializing these candidates once they prove concept through research and clinical development. The company differentiates itself by focusing on root causes of aging rather than single-disease drugs, using diverse, technology-enabled programs with a balanced pipeline, and leveraging advanced analytics and automation to accelerate discovery. The goal is to extend healthy years of life by ten years and reduce the healthcare burden from aging-related diseases.

Company Size

51-200

Company Stage

Series A

Total Funding

$1.2B

Headquarters

Redwood City, California

Founded

2021

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Simplify's Take

What believers are saying

  • May 22, 2026 financing confirmed investor demand and extended runway for 2026-2027 milestones.
  • August 2026 RTR242 enrollment expanded to 108, signaling tolerability and operational momentum.
  • Murdoch Children's partnership gives Retro autologous iPSC blood-stem-cell capability other startups lack.

What critics are saying

  • RTR242 still lacks human efficacy data; August 2026 dosing expansion only measured safety.
  • May 22, 2026 financing at $1.8 billion locks in enormous expectations before proof.
  • If first-in-human programs miss biomarker endpoints, Retro becomes a capital-intensive science project, not a company.

What makes Retro Biosciences unique

  • Retro pairs autophagy, reprogramming, and cell replacement under one aging-disease platform.
  • OpenAI's GPT-4b micro improved reprogramming marker expression 50-fold in vitro, August 2025.
  • Retro began Phase I RTR242 dosing in Adelaide, its first human trial, December 2025.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • 401(k) Retirement Plan
  • 401(k) Company Match
  • Unlimited Paid Time Off
  • Paid Holidays
  • Parental Leave
  • Professional Development Budget

Growth & Insights and Company News

6 month growth

1%

1 year growth

-1%

2 year growth

-2%
TradeFlock
Oct 16th, 2026
NewLimit raises $435M at $3.1B valuation as tech billionaires pour money into longevity

NewLimit, a longevity biotech co-founded by Coinbase chief executive Brian Armstrong, closed a $435 million Series C led by Founders Fund at a $3.1 billion valuation. Its first human trial, for alcohol-induced liver disease, is slated for 2027. NewLimit targets a named disease and is taking the FDA's conventional investigational new drug process, rather than selling wellness products. Armstrong is not alone. Sam Altman put $180 million into Retro Biosciences, which has raised more than $1.18 billion in total. Jeff Bezos backed Altos Labs, which leads the field with $5.56 billion in cumulative funding. Not every outsider succeeds. Analyst Sindhya Valloppillil notes that many tech-bred founders lacked clinical compliance depth and relied on wellness branding over solid science.

VARINDIA
May 21st, 2026
Sam Altman invests $180M in ageing reversal startup backed by OpenAI's GPT-4b micro

Sam Altman has invested approximately $180 million (₹1,700 crore) in Retro Biosciences, a startup working to slow ageing and combat diseases like Alzheimer's and cancer. Altman personally funded the company's early development before backing a larger funding round that valued Retro in the billions. Retro is collaborating with OpenAI on a specialised AI model called GPT-4b micro, designed to help redesign proteins involved in cellular reprogramming. The startup focuses on partial cellular reprogramming, attempting to reset ageing cells to a younger biological state without fully converting them into stem cells. Rather than treating age-related diseases individually, Retro aims to address the underlying biological processes that cause ageing itself. The AI model helps design proteins faster and identify solutions scientists might otherwise miss.

Epium
Mar 14th, 2026
Sam Altman backed Retro Biosciences tests longevity pill targeting brain aging

Sam Altman backed Retro Biosciences tests longevity pill targeting brain aging. Retro Biosciences, funded by OpenAI chief executive Sam Altman, is preparing its first human trial of a pill that aims to clear damaged proteins in the brain by rebooting cellular recycling linked to Alzheimer's and Parkinson's. Retro Biosciences, a longevity startup backed by OpenAI chief executive Sam Altman, is preparing to launch its first human clinical trial by the end of 2025 for an experimental small molecule pill called RTR242. The company was founded in 2021 with an initial 180 million investment from Altman and is led by chief executive Joe Betts-LaCroix, a scientist and entrepreneur who previously helped build what was described as the world's smallest computer. Retro's overarching ambition is to decouple aging from decline and disease by developing therapies that reset key aspects of human biology to a more youthful state and add 10 extra, healthy years to human lifespan. RTR242 is intended to treat Alzheimer's by reviving autophagy, the cellular recycling process that is activated by fasting and is widely believed to have broad antiaging effects. Betts-LaCroix described how "old, misfolded, mutated, broken, undigestible proteins inside cells" accumulate over time as "the normal cellular recycling system gets messed up." The pill is designed to clear "gunk in the cells" associated with Alzheimer's and Parkinson's and, if effective, could restart stalled autophagy pathways and clean up damage "especially in the brain cells." In contrast to newer Alzheimer's drugs such as Eisai's Leqembi and Eli Lilly's Kisunla, which slow cognitive decline by flushing out amyloid plaques, Retro is focused on therapeutics that aim to reverse aspects of aging rather than simply slow them. The company is in "hardcore preclinical mode" and has chosen Australia for its Phase 1 safety trial because it is faster and easier to initiate such studies there, with a trial site and lab vendors already selected and first participant enrollment expected toward the end of the year. Retro is also advancing two other major programs: RTR890, a treatment for blood diseases like leukemia that would generate fresh blood stem cells from a patient's own cells, and RTR888, a stem cell derived therapy targeting diseases of the central nervous system. To fund large scale clinical development, Retro aims to raise 1 billion in a Series A round, which would place it closer to rivals like Jeff Bezos backed Altos Labs, reported to have raised more than 3 billion from prominent tech investors. While some in the field, such as Gero founder Peter Fedichev, question whether a 10 year gain in healthy lifespan can be achieved through lifestyle alone, Betts-LaCroix argues that "curing cancer would add about three years to life expectancy, and curing heart disease about four," and that adding 10 healthy years "will be an even greater impact." Alongside its drug pipeline, Retro is exploring more radical longevity approaches through a partnership with OpenAI on protein design. In August, OpenAI described a custom "GPT-4b micro" protein designing Artificial Intelligence model developed with Retro, stating that GPT-4b micro improved the expression of stem cell reprogramming markers 50-fold compared with natural reprogramming factors. Cellular reprogramming, which seeks to reverse cellular aging and engineer new tissues for older bodies, is seen as one of Silicon Valley's most ambitious longevity bets. Betts-LaCroix says Retro aims to balance a traditional pharmaceutical strategy, focused on single diseases and acquirable drug programs like RTR242, with bolder attempts to "reset some aspect of our biology back to essentially a younger age." For now, Retro is moving cautiously with its first clinical trial while keeping options open for more transformative technologies powered by advances in Artificial Intelligence driven protein engineering. 55. March 14, 2026 New research comparing 178 countries finds Europe far ahead in comprehensive Artificial Intelligence regulation, while the United Kingdom and United States trail not only the European Union but also Kazakhstan. March 13, 2026 Yann LeCun is backing a world model approach to Artificial Intelligence with a $1.03B seed round, while Nvidia commits at least a gigawatt of compute to Mira Murati's Thinking Machines in a multiyear deal. March 13, 2026 The United States Central Command is using advanced artificial intelligence systems to rapidly process battlefield data in the joint US-Israeli campaign in Iran, while insisting that humans retain final authority over targeting decisions. March 13, 2026 A new optical compute interconnect consortium led by major chip and cloud companies aims to define an open specification for scale-up links in modern artificial intelligence infrastructure, shifting away from copper limitations. March 13, 2026 Nvidia and Dassault Systèmes are combining accelerated computing, physics-based world models and virtual twins to speed up design, simulation and deployment across sectors from automotive to life sciences and aerospace.

AZoM.com Limited
May 19th, 2025
New partnership aims to advance treatments for blood disorders and leukemia

MCRI, a flagship member of the Melbourne Biomedical Precinct and the Melbourne arm of the international research consortium, the Novo Nordisk Foundation Center for Stem Cell Medicine, reNEW, has today announced a significant research and commercial licensing agreement with Retro Biosciences.

Bioengineer.org
May 19th, 2025
New $35M US Partnership to Propel Breakthroughs in Blood Disorder Treatments

By integrating MCRI's cutting-edge discoveries with its proprietary platforms, Retro Biosciences aims to develop novel, autologous blood stem cell therapies that could eliminate the fatal risks associated with donor mismatches and immunological rejection.