Back to jobs

Senior Software Engineer (Backend)

Boston, US / Barcelona, Spain

About us:
Axiomatic_AI is dedicated to accelerating R&D by developing the next generation of Automated Interpretable Reasoning, a verifiably truthful AI model built for reasoning in science and engineering, empowering engineers specifically in hardware design and Electronic Design Automation (EDA), with a mission to revolutionize the fields of hardware design and simulation in the photonics and semiconductor industry. We seek highly motivated professionals to help us bring these innovations to life, driving the evolution from development to commercial product.

 

Position Overview

As a Senior Software Engineer (Backend) at Axiomatic, you will:

  • Design and build scalable backend services (FastAPI, FastMCP, Python)
  • Own key features end-to-end: from API design to database schema to deployment
  • Integrate AI capabilities (LLMs, Agents) into production systems
  • Collaborate with frontend, AI, and infrastructure teams on architecture and delivery
  • Ensure system reliability, performance, and security
  • Mentor other engineers as the team grows

Key Responsibilities

  1. Architecture & Design
    • Contribute to system architecture and technical decisions
    • Design for scalability, reliability, and security
    • Propose and implement improvements to codebase and infrastructure
    • Document technical designs and API contracts
    • Ensure best practices are followed by the team
  2. Backend Development
    • Design and implement REST APIs using FastAPI
    • Build scalable, maintainable, and testable services
    • Design database schemas and optimize SQL queries (PostgreSQL)
    • Integrate with external services (OpenAI, Anthropic)
    • Optimize API performance, latency, and throughput
  3. Quality & Testing
    • Write comprehensive unit and integration tests
    • Participate in code reviews (give and receive feedback)
    • Debug and resolve production issues
    • Maintain high code quality standards
  4. Collaboration & Mentorship
    • Work closely with Tech Lead on architecture and roadmap
    • Partner with Applied AI engineers in AI integrations
    • Mentor mid-level engineers and share knowledge

Required Skills & Experience
Must-Have

  • 7+ years of software engineering experience building and maintaining production systems
  • Strong in at least one backend language (Python, Java, Go, or TypeScript) and able to become productive in Python quickly
  • Strong software engineering fundamentals: design patterns, code structure, testing practices, and code review habits
  • Experience working with databases (SQL and NoSQL), such as PostgreSQL, Redis, and using ORMs or data access layers where appropriate
  • API/service development experience (REST, async programming) and collaboration across teams
  • Cloud platform experience: GCP preferred (AWS, Azure acceptable)
  • Testing mindset: unit tests, integration tests, TDD
  • Version control & CI/CD: Git, GitHub Actions, Docker
  • Strong problem-solving skills: debugging, performance optimization
  • Fluent in English (Spanish is a plus)

Nice-to-Have

  • Solid working proficiency in Python for production code (clean code, typing, async patterns, testing), even if it is not your primary language
  • Experience with FastMCP
  • Familiarity with applied AI frameworks such as PydanticAI, LangChain, or similar (or strong interest in learning them)
  • Experience working with cloud AI platforms such as Vertex AI (or equivalent on AWS/Azure)
  • Awareness of AI safety, reliability, and security concerns (prompt injection, data leakage, guardrails)
  • Understanding of infrastructure as code (Terraform)
  • Experience with microservices architecture

 

Tech Stack
Current Stack:

  • Backend: Python, FastAPI, SQLAlchemy, Pydantic AI, Alembic
  • Databases: PostgreSQL, Redis (caching)
  • APIs: REST, WebSockets, SSE
  • AI/ML: OpenAI API, Anthropic, Gemini
  • Cloud: Google Cloud Platform (Cloud Run, Cloud SQL, GCS, VPCs, Bucket)
  • Infrastructure: Terraform, Docker
  • CI/CD: GitHub Actions, Terraform
  • Testing: pytest, pytest-asyncio, pytest-cov

 

What we offer:

Competitive compensation

  • Stock Options Plan: Empowering you to share in our success and growth.
  • Cutting-Edge Tools: Access to state-of-the-art tools and collaborative opportunities with leading experts in artificial intelligence, physics, hardware and electronic design automation.
  • Work-Life Balance: Flexible work arrangements in one of our offices with potential options for remote work.
  • Professional Growth: Opportunities to attend industry conferences, present research findings, and engage with the global AI research community.
  • Impact-Driven Culture: Join a passionate team focused on solving some of the most challenging problems at the intersection of AI and hardware.

 

Why join us? 

At Axiomatic_AI, you will be working on technology that drives innovation in AI for scientific and engineering applications in line with our 10X30 mission. This is your opportunity to contribute to the development of new AI architectures that can reason coherently and produce interpretable and verifiable solutions. Consequently, see those ideas commercialized into products that will shape the future of hardware and computing, while collaborating with a global team of engineers and AI specialists. We believe in pushing the boundaries of what is possible and continuously seek to redefine the intersection of AI, with focus on formal consistency. If you're ready to take your expertise in artificial intelligence and physics to the next level, we want to hear from you!

 

Worried about not meeting every qualification? Studies show that women and people of color are less likely to apply for jobs unless they meet every listed requirement. At Axiomatic-AI, we are dedicated to creating a diverse, inclusive, and authentic workplace. If this role excites you but your background doesn’t perfectly match every qualification, we still encourage you to apply. You could be the perfect fit for this position or another opportunity with us.

Apply for this job

*

indicates a required field

Resume/CV*

Accepted file types: pdf, doc, docx, txt, rtf

Cover Letter

Accepted file types: pdf, doc, docx, txt, rtf

Select...
What is your preferred office location? *
Select...
Select...
Select...

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey. Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

As set forth in Axiomatic_AI’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

Select...
Select...
Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Select...

Voluntary Self-Identification of Disability

Form CC-305
Page 1 of 1
OMB Control Number 1250-0005
Expires 04/30/2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Select...

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.