Sr. Back-End Engineer Job at 80Twenty (San Francisco)

Engineer Sr Analyst

The Engineer Sr Analyst is an intermediate-level position responsible for a vari...

Location

India , Chennai; Pune

Salary:

Not provided

Citi

Expiration Date

Until further notice

Requirements

7+ years of experience in Java full stack software development, with a focus on enterprise-level applications
Proven experience developing and deploying applications using the specified technology stack (Spring Boot, Angular, MongoDB)
Experience working in a regulated environment, preferably in the financial services or banking industry
Experience with CI/CD pipelines and tools (e.g., Jenkins, GitLab CI/CD, Maven/Gradle)
Backend: Expert proficiency in Java and the Spring Boot framework
Frontend: Strong expertise in Angular (version 2+), TypeScript, HTML5, and CSS3
Database: Hands-on experience with MongoDB, including schema design, query optimization, and performance tuning
Strong understanding of RESTful APIs, microservices architecture, and version control systems (Git)
Experience working in Financial Services or a large complex and/or global environment
Consistently demonstrates clear and concise written and verbal communication

Job Responsibility

Design, develop, and maintain both front-end and back-end components of the platform & services provisioning automation framework
Build dynamic and responsive user interfaces using Angular, ensuring a seamless and intuitive user experience
Develop scalable and secure back-end microservices using Spring Boot, with a strong focus on RESTful API development and integration
Design and manage database schemas and queries in MongoDB, optimizing for performance and data integrity
Act as a technical subject matter expert (SME) for the framework, providing guidance and mentorship to junior developers
Lead requirements gathering discussions with business stakeholders and product owners to translate business needs into technical specifications
Coordinate with the QA team to ensure rigorous testing and quality assurance throughout the development process
Timely analyze and troubleshoot user issues and incidents as a development SME, providing root cause analysis and implementing effective resolutions
Participate in code reviews to ensure code quality, adherence to best practices, and security standards
Proactively identify and address technical debt and performance bottlenecks within the application

Fulltime

Sr. Full-Stack Engineer, Product

We’re looking for an experienced product-focused full-stack engineer to join our...

Location

United States

Salary:

175000.00 - 215000.00 USD / Year

Zora

Expiration Date

Until further notice

Requirements

4+ years of experience as a software engineer working on user-facing or product-centric systems
Strong experience building both front-end applications at scale (React, React Native, Next.js, TypeScript) and back-end systems & APIs (Node/TypeScript, GraphQL, or similar)
Ability to move fluidly across the stack: Front-end (React/React Native), Back-end (TypeScript/Node, GraphQL, Python), Smart contracts or on-chain logic (Solidity) — or a willingness to learn
A strong product sense and a user-first mindset
Comfort owning features from ideation through implementation and production support
Familiarity with or desire to learn crypto/web3 concepts
Desire to stay current with modern software best practices across full-stack development
MUST be located in a US Time Zone

Job Responsibility

Build and continuously improve trading-related features across web, mobile, backend services, and on-chain components
Design, build, and maintain APIs, services, and user interfaces that support high-scale trading and creation experiences
Own projects end-to-end—from system design to implementation, testing, rollout, and post-launch iteration
Work closely with PMs and Designers to shape product direction and ensure user needs are kept at the center
Participate in code reviews, RFCs, technical design discussions, and architecture planning
Collaborate with engineers across the stack, contributing wherever the product needs you most
Participate in on-call rotation and help maintain reliability of core trading surfaces
Communicate clearly with cross-functional stakeholders on status, risks, and milestones

What we offer

Remote-First Culture: Work from anywhere in the world!
Competitive Compensation: Including salary, pre-IPO stock options, token compensation, and additional financial incentives
Comprehensive Benefits: Robust healthcare options, including fully covered medical, dental, and vision for employees
Retirement Contributions: Up to 4% employer match on your 401(k) contributions
Health & Wellness: Free memberships to One Medical, Teladoc, and Health Advocate
Unlimited Time Off: Flexible vacation policies, company holidays, and recharge weeks to prioritize wellness
Home Office Reimbursement: To cover home office items, monthly home internet, and monthly cell phone (if applicable)
Ease of Life Reimbursement: To cover everything from an Uber home in the rain, childcare, or meal delivery
Career Development: Access to mentorship, training, and opportunities to grow your career
Inclusive Environment: A culture dedicated to diversity, equity, inclusion, and belonging

Fulltime

Sr. Back-End Engineer

This is a once in a life time opportunity to join what is soon to be a unicorn p...

Location

United States , San Francisco

Salary:

200000.00 - 300000.00 USD / Year

80Twenty

Expiration Date

Until further notice

Requirements

Startup mindset
6+ years of back-end development experience, with deep expertise with Typescript/Python
Experience leading technical initiatives and shipping scalable, high-performance systems to support web and mobile applications
Strong knowledge of modern back-end tooling
Strong knowledge of bash scripting and linux/unix commands
A passion for creating fast, optimized and elegant solutions to difficult problems
Expertise with AI code generation tools

Job Responsibility

Lead the development, optimization and expansion of core backend services
Drive best practices in performance, security, and scalability as our client scales rapidly
Work closely with Product, Design and Front-end teams to deliver seamless, intuitive user experiences
Own key architectural decisions, mentoring engineers, and elevating back-end excellence across the company
Build out data-driven services and systems to improve the customer experience
Mentor an influence engineering culture, fostering innovation and technical ownership within the team

What we offer

equity package

Fulltime

Sr. Back-End Engineer

This is a once in a life time opportunity to join what is soon to be a unicorn p...

Location

United States , San Francisco

Salary:

200000.00 - 300000.00 USD / Year

80Twenty

Expiration Date

Until further notice

Requirements

Startup mindset
6+ years of back-end development experience, with deep expertise with Typescript/Python
Experience leading technical initiatives and shipping scalable, high-performance systems to support web and mobile applications
Strong knowledge of modern back-end tooling
Strong knowledge of bash scripting and linux/unix commands
A passion for creating fast, optimized and elegant solutions to difficult problems
Expertise with AI code generation tools

Job Responsibility

Lead the development, optimization and expansion of core backend services
Drive best practices in performance, security, and scalability as our client scales rapidly
Work closely with Product, Design and Front-end teams to deliver seamless, intuitive user experiences
Own key architectural decisions, mentoring engineers, and elevating back-end excellence across the company
Build out data-driven services and systems to improve the customer experience
Mentor an influence engineering culture, fostering innovation and technical ownership within the team

What we offer

equity

Fulltime

Sr. Back-End Engineer

This is a once in a life time opportunity to join what is soon to be a unicorn p...

Location

United States , San Francisco

Salary:

200000.00 - 300000.00 USD / Year

80Twenty

Expiration Date

Until further notice

Requirements

Startup mindset
6+ years of back-end development experience, with deep expertise with Typescript/Python
Experience leading technical initiatives and shipping scalable, high-performance systems to support web and mobile applications
Strong knowledge of modern back-end tooling
Strong knowledge of bash scripting and linux/unix commands
A passion for creating fast, optimized and elegant solutions to difficult problems
Expertise with AI code generation tools

Job Responsibility

Lead the development, optimization and expansion of core backend services
Drive best practices in performance, security, and scalability as our client scales rapidly
Work closely with Product, Design and Front-end teams to deliver seamless, intuitive user experiences
Own key architectural decisions, mentoring engineers, and elevating back-end excellence across the company
Build out data-driven services and systems to improve the customer experience
Mentor an influence engineering culture, fostering innovation and technical ownership within the team

What we offer

equity package

Fulltime

Sr. Back-End Engineer

This is a once in a life time opportunity to join what is soon to be a unicorn p...

Location

United States , San Francisco

Salary:

200000.00 - 300000.00 USD / Year

80Twenty

Expiration Date

Until further notice

Requirements

Startup mindset
6+ years of back-end development experience, with deep expertise with Typescript/Python
Experience leading technical initiatives and shipping scalable, high-performance systems to support web and mobile applications
Strong knowledge of modern back-end tooling
Strong knowledge of bash scripting and linux/unix commands
A passion for creating fast, optimized and elegant solutions to difficult problems
Expertise with AI code generation tools

Job Responsibility

Lead the development, optimization and expansion of core backend services
Drive best practices in performance, security, and scalability as our client scales rapidly
Work closely with Product, Design and Front-end teams to deliver seamless, intuitive user experiences
Own key architectural decisions, mentoring engineers, and elevating back-end excellence across the company
Build out data-driven services and systems to improve the customer experience
Mentor an influence engineering culture, fostering innovation and technical ownership within the team

What we offer

equity package

Fulltime

Sr Back End Engineer for Streaming Data Platform

Do you want to build a high-quality data platform that will innovate financial m...

Location

Lithuania

Salary:

Not provided

KOR Financial

Expiration Date

Until further notice

Requirements

A minimum of 8+ years of experience as a Back End Engineer
Experience with Java and Spring Boot
Experience with building and running applications on public cloud vendors like AWS
Working experience with one or more of the following technologies: Kafka
Kafka Streams processor API (not high-level DSL)
DataBricks
EMR
DeltaFlow
Experience profiling, debugging, and performance tuning complex distributed systems
Willingness to closely collaborate by pairing

Job Responsibility

Designing and implementing the streaming data platform engine and SDK
Implementing new features for our range of web and streaming applications and data reporting capabilities
Be an active voice in the platform's build-out in regards to the technical choices and implementations
Working closely with the broader team to embrace new challenges and adapt requirements as we continue to grow and adjust priorities
Using Claude Code and other AI tools responsibly to boost productivity
Paired programming with a growing team of Back-end, Data, and Front-end Engineers

What we offer

Competitive salary
great IT equipment
expense allowance
Flexible working times
Fully remote, with fun social activities and gatherings
A span of control that matches your ambitions and skills
Culture of trust, kindness, empowerment, and constructive feedback
Working directly with seasoned international engineers with experience at companies like Pivotal (including ex-Spring team members), VMware, Confluent (including Kafka committers), and Apple

Sr. Product Engineer (back-end)

Our organizers use WeTravel to win travelers by creating beautiful proposals and...

Location

Netherlands , Amsterdam

Salary:

Not provided

WeTravel

Expiration Date

Until further notice

Requirements

7+ years of software engineering experience (ideally full-stack) with strong product ownership mindset
Proficiency with Ruby on Rails, or in at least two other languages Python/Go/Java/Kotlin/Node.js or .NET with desire to learn Ruby
Have experience and the desire to build user experiences (e.g. web front-ends)
Have experience building and working with distributed systems, microservices and event-driven architecture and demonstrate strong systems thinking and can design for scalability serving thousands of customers a day
Have experience with operating production systems, monitoring, and on-call responsibilities
Have excellent communication skills and experience working in multicultural, distributed teams
Experience using AI assistants like Cursor, Claude Code or GitHub Copilot for code generation and testing
Have experience leading projects and mentoring other engineers

Job Responsibility

Lead and build features end-to-end: from reviewing user interviews and product design, through architection and building systems to deployment and monitoring in production
Partner closely with our product team to discover user problems and shape their solutions - creating a world class experience for our organizers and travelers
Write high-quality, maintainable back-end code in Ruby on Rails and occasionally front-end code in React/React Native
Design reliably, scalable services and systems that anticipate the needs of our customers and future scale of our business
Ensure our services are always on by building resilient applications, ensuring they are well monitored and mitigating incidents as an on-call/incident responder
Mentor teammates and contribute to WeTravel’s engineering practices and excellence

What we offer

Generous "Time to Recharge" policy - enjoy unlimited paid time off to rest, recharge, and show up as your best self
Work remotely for a maximum of 4 weeks per calendar year
2-week cross-functional onboarding program
Cycle-to-work scheme (Swapfiets subscription) or commuting reimbursement
Tuesday team lunches and after-work social events
Beautiful office in central Amsterdam - rooftop garden and right by Rokin metro
Extensive paid family leave
Three paid volunteer days per year - take time to give back to causes you care about, on us
Cutting-edge equipment and tools to set you up for success
Join an international, travel-loving team with a passion for adventure and innovation

Fulltime

Sr. Back-End Engineer

80Twenty

Location:
United States , San Francisco

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
January 11, 2026

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