Backend Engineer Job at YC Work at a Startup (San Francisco)

Backend Engineer – Validator Engine Specialist

Do you thrive on precision and enjoy solving complex problems? Are you excited b...

Location

Salary:

Not provided

KOR Financial

Expiration Date

Until further notice

Requirements

Bachelor's Degree or higher in Engineering, Computer Science, or Information Technology
Residing in or near the CET time zone (including Eastern Europe)
A minimum of 3+ years of experience as a Backend Engineer
Experienced with Java and Spring Boot Framework
Demonstrating a firm reliance on unit testing and mocking frameworks
Self-motivated and take ownership of their work
Detail-oriented perfectionists who take pride in covering all their bases
Energized by solving repetitive, complex problems systematically
Open to coaching by senior engineers with deep experience
Excellent communicators with strong English skills

Job Responsibility

Configuring and maintaining the validator engine to meet jurisdictional requirements
Extending the rules engine (written in Java) to support new use cases
Implementing, debugging, and refining JSON-based DSL rules for accuracy and compliance
Collaborating with three other team members to support ten jurisdictions
Ensuring thorough testing and validation of all configurations

What we offer

Mentorship by senior engineers with experience at companies like Pivotal and VMware
The chance to join a rapidly growing team with the opportunity to move into the broader engineering organization
A collaborative, remote-friendly environment
Culture of trust, empowerment, and constructive feedback
Competitive salary, great IT equipment, and expense allowance
Flexible working times
A span of control that matches your ambitions and skills
Commitment to a genuine, balanced relationship

Senior LLM Backend Engineer

We are looking for a Senior Backend Engineer with a strong focus on Large Langua...

Location

Spain

Salary:

Not provided

Bark

Expiration Date

Until further notice

Requirements

Extensive production experience with Python in backend engineering
Proven experience integrating LLMs into applications via APIs or SDKs
Strong experience building and maintaining APIs for LLM-based features
Strong experience building and maintaining event-driven workflows
Strong experience building and maintaining business logic that consumes AI outputs
Strong experience building and maintaining integrations with 3rd party AI/ML platforms
Solid SQL and NoSQL experience (especially in AI data pipelines)
Production experience with Docker, ideally with Kubernetes or AWS Fargate/ECS/EKS
Experience deploying and maintaining AI services in cloud environments
Strong organisational skills and ability to deliver in a fast-paced, product-focused environment

Job Responsibility

Work with product managers to understand user needs and translate them into AI-powered functionality
Design and build APIs, services, and workflows that integrate LLMs (both proprietary and open-source)
Implement prompt engineering, RAG pipelines, and model fine-tuning where required
Optimise AI inference performance, scalability, and cost-effectiveness
Ensure AI features meet high standards for security, reliability, and maintainability
Collaborate with other engineers to integrate AI features seamlessly into the wider system
Stay on top of emerging LLM technologies and best practices, running experiments and sharing knowledge across the team

What we offer

Fully remote working
Personal annual L&D Budgets with 600€ to spend on your development
Being at the forefront of an industry with new and exciting problems to solve

Fulltime

Backend Engineer

A backend engineer at Hebbia blends expertise in systems, application layer soft...

Location

United States , New York City; San Francisco

Salary:

160000.00 - 300000.00 USD / Year

Hebbia

Expiration Date

Until further notice

Requirements

Bachelor's or Master's degree in Computer Science, Data Science, Statistics, or a related field
5+ years software development experience at a venture-backed startup or top technology firm, with a focus on backend software engineering
Proficiency in building backend and API systems using technologies such as Python, Java, or Go
Extensive experience with cloud platforms (e.g., AWS)
Working experience with one or more of the following: Kafka, ElasticSearch, PostgreSQL, and/or Redis
Ability to analyze complex problems, propose innovative solutions, and effectively communicate technical concepts to both technical and non-technical stakeholders
Proven experience in leading software development projects and collaborating with cross-functional teams
Enthusiasm for continuous learning and professional growth
Embraces rapid prototyping with an emphasis on user feedback
Autonomous and excited about taking ownership over major initiatives

Job Responsibility

Own critical system components
Unlock O(1) universal indexing
Build and iterate on our high-scale document build system
Drive performance optimization
Architect and implement performance-tuning solutions
Mentor and guide
Provide technical leadership, mentorship, and guidance to junior engineers

What we offer

PTO: Unlimited
Insurance: Medical + Dental + Vision + 401K
Eats: Catered lunch daily + doordash dinner credit if you ever need to stay late
Parental leave policy: 3 months non-birthing parent, 4 months for birthing parent
Fertility benefits: $15k lifetime benefit
New hire equity grant: competitive equity package

Fulltime

Senior Software Engineer (Backend)

Tekmetric is looking for a Senior Software Engineer (Backend) to take part in th...

Location

Salary:

Not provided

Tekmetric

Expiration Date

Until further notice

Requirements

5+ years software engineering experience
Experience with Java and SQL databases (2+ years)
Enjoy working in fast moving and dynamic environments
High standards and a strong work ethic
Strong product sense and communication skills
Experience working cross-functionally and can work within ambiguity
Enjoy bringing innovation and impact to customers

Job Responsibility

Design and implement scalable services and applications that enable positive user experiences and measurable business growth
Provide implementation estimates and evaluations of different solutions
Collaborate with and across agile teams to design, develop, test, and support technical solutions
Ensure application performance, uptime, and scale, maintaining high standards of code quality and thoughtful application design
Manage the end-to-end life cycle on the development of new features
Provide technical leadership, mentorship and growth to junior team members as we scale

What we offer

Flexibility of remote work
Competitive base salaries
Generous Paid Time Off
Paid maternity, parental bonding, and medical leave
Comprehensive health benefits (Medical, Dental, Vision, Prescription)
Free, confidential counseling through BetterHelp
401(k) Retirement Savings Plan with 100% employer match on contributions up to 6%
Flexible Spending Accounts (FSA) and Health Savings Accounts (HSA)
Life and Accidental Death & Dismemberment (AD&D) Insurance
Up to $60/month toward fitness or mental health

Staff Backend Engineer

Kalepa is looking for a Staff Backend Engineer to work on its AI Copilot platfor...

Location

Salary:

145000.00 - 185000.00 USD / Year

Kalepa

Expiration Date

Until further notice

Requirements

8+ years of relevant software engineering experience
Excellent development skills including design, debugging and problem solving
Bachelors or master's degree in computer science or a related field
Experience with Python3 or other OO languages (Java, C++, C#, etc.)
Experience with AWS (EC2, Lambda, etc.) and serverless technologies
Experience with relational databases, preference for PostgreSQL
Experience working on distributed systems creating scalable, fault-tolerant infrastructure
Experience building data driven microservices leveraging RESTful API's
Experience with tools such as Docker, Git, GitHub, Flask, NumPy, Pandas

Job Responsibility

Work on advanced systems including NLP, firmographic data, entity resolution
Solve problems at the intersection of large and performant data pipelines, distributed systems, machine learning models, and robust infrastructure
Collaborate with a global team of full-stack, data, ML, and DevOps engineers
Build scalable and reliable backend solutions

What we offer

Competitive salary (based on experience level)
Significant equity options package
20 days of PTO a year
Global team offsites
Healthy living/gym stipend
Mobile phone bill stipend
Continuing education credits

Fulltime

Backend Engineer

As a Software Engineer, you’ll work on building scalable and reliable backend se...

Location

India , Bangalore

Salary:

Not provided

Ethos

Expiration Date

Until further notice

Requirements

4+ years of experience
Experience with backend architectural patterns of large, high-scale web applications
Proficiency in designing clean, maintainable APIs
Experienced with software engineering best practices – design patterns, code reviews, unit and integration testing etc.
Good communication skills (written and verbal)

Job Responsibility

Design, build and maintain backend services and APIs
Collaborate with engineers, PMs and non-technical stakeholders to define and deliver features
Ensure system reliability, scalability and performance
Find and solve performance issues
Share and advocate for best engineering practices

Senior Software Engineer, Backend

Kiddom is a groundbreaking educational platform that promotes student equity and...

Location

United States , San Francisco

Salary:

160000.00 - 220000.00 USD / Year

Kiddom

Expiration Date

Until further notice

Requirements

BS or MS in Computer Science or a related field
6+ years professional software engineering experience
Experience scaling integration systems
Proficiency in working with databases (SQL & NoSQL) such as PostgreSQL, MySQL, MongoDB, or Redis
Experience with cloud platforms like AWS, GCP, or Azure, and containerization tools like Docker and Kubernetes
Experience with microservices architecture and distributed systems
Strong knowledge of design patterns and software engineering best practices
You've been through the planning, launching and refactoring phases of code you wrote
Excellent problem solving and debugging skills
Ability to work as part of a collaborative team in a fast-paced environment

Job Responsibility

Design, develop, and maintain backend services, APIs, and databases
Ensure the scalability, security, and performance of backend systems
Collaborate with frontend engineers, product managers, and other stakeholders to deliver high-quality features
Optimize applications for performance, reliability, and scalability
Conduct code reviews and provide mentorship to junior engineers
Troubleshoot and resolve production issues, ensuring system uptime and reliability
Work with our customers to troubleshoot issues and bugs and also help with Kiddom onboarding

What we offer

The opportunity to make a measurable impact in K-12 education
Competitive salary and equity in a hyper-growth, mission-driven organization
Full health benefits: medical, dental, and vision
Flexible vacation policy
401k
An inclusive, positive team culture
A passionate, collaborative team obsessed with building transformative education technology
Meaningful equity
Health insurance benefits: medical (various PPO/HMO/HSA plans), dental, vision, disability and life insurance
One Medical membership (in participating locations)

Fulltime

Software Engineer Backend Travel

Are you a passionate and skilled backend software engineer looking for an exciti...

Location

United Kingdom , London

Salary:

80000.00 - 90000.00 GBP / Year

Antella Travel Recruitment

Expiration Date

Until further notice

Requirements

Bachelor's degree in Computer Science, Software Engineering, or a related field
3+ years of experience in backend software development
A passion for designing and building fantastic API's, delivering great developer experiences to go with it
An interest in working with Elixir, this is what our client mostly works with
A high bar in code quality and API design
Experience in Travel / Flights, hotels or cars REQUIRED

Job Responsibility

Designing, developing, and maintaining the server-side components of our client's innovative software solutions
Collaborate with cross-functional teams, including frontend developers, designers, and product managers, to create scalable and efficient backend systems that power our client's applications

What we offer

Hybrid work environment (combination of remote and in-office work)
Comprehensive benefits package
Opportunities for professional growth and development
Collaborative and supportive team culture
Chance to work on innovative projects with cutting-edge technologies

Fulltime

Backend Engineer

YC Work at a Startup

Location:
United States; France , San Francisco ▼
Paris

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
January 07, 2026

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