Backend development (Java, .NET, JavaScript) jobs

xEngineer (Backend oriented)

Wix · Posted Nov 9, 2026

Vilnius, Vilnius County, Lithuania
€3K–€6K per month
3+ years

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Own features from idea to production across our Get Paid products, such as invoices, price quotes and pay links, working mainly on the backend and across stack boundaries when needed

Compensation

Salary range is 3000 - 5500 Eur GROSS / month (Total compensation, including RSUs package)

Responsibilities

Own features from idea to production across our Get Paid products, such as invoices, price quotes and pay links, working mainly on the backend and across stack boundaries when needed
Design and build APIs, data models and services that are reliable, secure and scalable
Apply AI-powered tools for planning, design, implementation, testing and debugging
Collaborate closely with product managers, designers and other engineers to shape solutions and deliver a high-quality products
Take care of service stability and performance in production, and take part in code reviews

Skills

backend development JVM-based languages microservice architecture API design debug production issues CI/CD practices AI tools CI/CD

Benefits

Discount stock purchasing plans (ESPP)
Health and personal accident insurance
Daily lunch and snacks at the office
Commuting allowance
Discounted phone operator services and compensation for a new phone

See full job description

AI Product Engineer

ControlUp · Posted Nov 9, 2026

Open

Poland
Hybrid
Full-time
5+ years

Apply with RefersoAI Apply on careers page

Build AI-powered product features from concept to production, owning full-stack development and customer-facing delivery.

Responsibilities

Own end-to-end feature development from customer problem to backend, data, UI, release and measurement
Build data pipelines integrating vulnerability, patch and device data
Design and ship AI features for risk explanation, prioritization and remediation
Ensure production quality with monitoring, alerting and reliability
Collaborate directly with customers and field teams to iterate on solutions

Requirements

Nice to have: security or compliance domain
Nice to have: endpoint or IT operations
Nice to have: founding engineer or early-startup experience
Nice to have: side projects or open source

See full job description

Software Engineer, AI Developer Platform

Mirage · Posted Nov 9, 2026

Open

Union Square, New York, United States
On-site
Full-time · Senior
5+ years

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Backend engineer responsible for building and maintaining AI-driven development infrastructure, CI/CD, security, and developer platform tools at Mirage.

Responsibilities

Ship features alongside product engineers across video creation software, rendering engine, and developer platform
Turn insights into tools, agents, and streamlined workflows
Rebuild CI/CD to support high change volume
Make deployments safe with progressive rollouts and automated rollback
Own environments for coding agents, including sandboxes and tooling

Requirements

Nice to have: offensive security
Nice to have: penetration testing
Nice to have: red-teaming
Nice to have: bug bounties
Nice to have: CTFs

Skills

backend development full-stack software CI/CD cloud infrastructure security coding agents LLM agents merge queues monorepo tooling test-impact analysis CI/CD tools cloud infrastructure platforms security scanning tools AI-assisted vulnerability triage feature flags canary analysis sandboxing audit logs

Benefits

Comprehensive medical, dental, and vision plans
401K with employer match
Commuter Benefits
Catered lunch multiple days per week
Dinner stipend

See full job description

Forward Deployed Engineer (FDE)

Appsforce · Posted Nov 9, 2026

Open

Tel Aviv, Tel Aviv, Israel
On-site
Mid

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A hands-on engineering role focused on AI adoption within a financial institution, involving development of AI-powered applications, integrations, and end-to-end solution deployment.

Requirements

Software Engineering
Backend Development
Full Stack Development
LLMs
APIs

Skills

Software Engineering Backend Development Full Stack Development LLMs APIs System integrations Data processing Software architecture Communication Interpersonal skills

See full job description

Senior Software Engineer - Billing Automation - 12 Month FTC

Wireless Logic · Posted Nov 2, 2026

Open

Poland
Hybrid
Contract · Senior
5+ years

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Lead full‑stack engineering of the billing platform, designing and building TypeScript/NestJS domain services, React front‑ends, event‑driven workflows, and PostgreSQL data models for a high‑volume billing system.

Responsibilities

Design, build and maintain TypeScript/NestJS domain services
Build React applications
Shape billing rules and models
Build and evolve event‑driven workflows with Kafka or RabbitMQ
Design and optimise PostgreSQL schemas and queries

Requirements

Bachelor's degree in Computer Science or related field
Nice to have: AWS (ECS, S3, Parameter Store, SES)
Nice to have: Terraform
Nice to have: Observability (metrics, tracing, logs, Grafana)
Nice to have: Domain‑driven design

Skills

TypeScript NestJS React Kafka RabbitMQ PostgreSQL Event‑driven architecture Backend development Full‑stack development Testing CI/CD GitLab Grafana Terraform AWS

Benefits

Full training and ongoing support
Remote/hybrid flexibility
Office culture
Employee growth opportunities

See full job description

Senior Software Engineer - BE

Toast · Posted Dec 9, 2025

Open

Chennai, Tamil Nadu, India
Hybrid
Full-time · Senior
6+ years

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As a Senior Backend Software Engineer at Toast, you’ll play a critical role in shaping the backend systems that power our platform, focusing on scalable, reliable, and secure backend services.

Responsibilities

Build new products and Evolve Toast’s existing products suite to meet global market needs
Lead projects from discovery and development to roll out
Design, develop, and maintain robust, scalable, and secure backend services and APIs
Collaborate closely with cross-functional teams, including product managers, frontend engineers, and data teams, to deliver impactful solutions
Lead efforts to enhance the performance and reliability of our systems, ensuring high availability and low latency

Requirements

Any UG
Nice to have: open-source contributions
Nice to have: mentoring

Skills

backend development Java Kotlin RESTful APIs microservices architecture database design SQL NoSQL AWS Docker Kubernetes event-driven architectures Kafka RabbitMQ

Benefits

competitive compensation and benefits programs

See full job description

Staff Software Engineer

Raydar · Posted Nov 5, 2026

Open

San Francisco, California, United States
On-site
Full-time · Staff
$250K–$320K per year
3+ years

Apply with RefersoAI Apply on careers page

Own the design and architecture of core backend systems for a real-time product, taking features from first design through to live production.

Compensation

Base salary: USD 250K to 320K

Responsibilities

Design and own core backend systems for low-latency, real-time services
Drive performance and reliability improvements using event-driven designs and parallel processing
Collaborate with a small engineering group and company founders across infrastructure, backend and reliability work
Deploy, operate and scale fault-tolerant distributed systems on container orchestration
Take features from initial design through to live production, often within days

Requirements

Computer Science degree
Nice to have: Python
Nice to have: machine learning models
Nice to have: startup experience
Nice to have: mid-size company experience

Skills

software engineering backend development full-stack software database design performance optimization distributed systems container orchestration AI large language models Python

Benefits

Equity

See full job description

Applied AI Engineer

Raydar · Posted Nov 4, 2026

Open

San Diego, California, United States +2 more
Hybrid
Full-time · Senior
$160K–$250K per year

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Design and build the AI layer of a software product, defining how the system reasons, coordinates multi-step tasks and interacts with users. The work covers agentic workflows, model integrations, evaluation and reliability, and close partnership with frontend and backend engineers.

Locations (3)

San Diego, California, United States
Los Angeles, California, United States
San Francisco Bay Area, California, United States

Compensation

Salary: $160K - $250K

Responsibilities

Build multi-step agent workflows that track state, propose actions and carry tasks through to completion.
Link language models to external functions, stored context and lookup layers that span mixed data sources.
Safeguard sensitive information and design fallback behavior for failed tools, incomplete inputs and unreliable model outputs.
Set up test harnesses that score how well generative features perform and feed results back into iteration.
Tune AI interactions for speed, clarity, and user control.

Requirements

Master's degree in computer science, mathematics, physics or a related quantitative field
Nice to have: FastAPI
Nice to have: manufacturing background
Nice to have: industrial operations software background

Skills

Python language-model agents function calling stateful context self-directed planning systematic scoring and testing retrieval systems backend development FastAPI

Benefits

Bonus
Equity

See full job description

Principal Software Engineer (Cortex Vulnerability Experience Platform)

Palo Alto Networks · Posted Jul 27, 2026

Open

California, United States
Principal
$147K–$238K per year
8+ years
Visa sponsorship

Apply with RefersoAI Apply on careers page

Design, build, and maintain the features for the unified vulnerability and exposure management experience

Compensation

$147,000.00 - $237,500.00/yr

Responsibilities

Design, build, and maintain the features for the unified vulnerability and exposure management experience
Take part in architecture strategy sessions - design solutions that accommodate the requirements of the various groups across Cortex
Collaborate with teams to solve problems, reduce technical debt, and evolve development practices
Drive technical best practices and evangelize new technologies within the engineering org
Collaborate with other engineers and ensure that your team delivers high-quality output

Skills

Python backend development cloud platforms CI/CD test driven development GCP AWS Azure

See full job description

Staff Software Engineer, Backend

AssetMark · Posted Jun 12, 2026

Open

Austin, Texas, United States
On-site
Full-time · Staff
$180K–$220K per year
8–12 years

Apply with RefersoAI Apply on careers page

Voyant is seeking a hands‑on Staff Engineer, Backend Engineering to play a key role in building and evolving our core server platform.

Compensation

Compensation: The Base Salary range for this position is between $180,000-$220,000. This position will also be eligible for additional variable incentive compensation and competitive benefits.

Responsibilities

Hands‑On Development – Design, build, and maintain backend systems, APIs, and services.
Technical Leadership – Serve as the go‑to technical leader for the team, guiding design decisions and setting engineering standards.
Mentorship – Mentor and support junior developers, providing guidance, feedback, and technical coaching.
Architecture & Design – Contribute to and help shape scalable, secure, and maintainable system architecture.
Code Quality – Lead code reviews and promote best practices across the codebase.

Requirements

Bachelor's in Computer Science
Master's in Computer Science

Skills

Spring Hibernate SSO SAML OpenID MySQL Agile Backend Development Software Architecture Design Patterns

Benefits

Flex Time or Paid Time Off and Sick Time Off
401K – 6% Employer Match
Medical, Dental, Vision – HDHP or PPO
HSA – Employer contribution (HDHP only)
Volunteer Time Off

See full job description

xEngineer (Backend oriented)

Wix · Posted Nov 9, 2026

Open

Vilnius, Vilnius County, Lithuania
€3K–€6K per month
3+ years

Apply with RefersoAI Apply on careers page

Own features from idea to production across our Get Paid products, such as invoices, price quotes and pay links, working mainly on the backend and across stack boundaries when needed

Compensation

Salary range is 3000 - 5500 Eur GROSS / month (Total compensation, including RSUs package)

Responsibilities

Own features from idea to production across our Get Paid products, such as invoices, price quotes and pay links, working mainly on the backend and across stack boundaries when needed
Design and build APIs, data models and services that are reliable, secure and scalable
Apply AI-powered tools for planning, design, implementation, testing and debugging
Collaborate closely with product managers, designers and other engineers to shape solutions and deliver a high-quality products
Take care of service stability and performance in production, and take part in code reviews

Skills

backend development JVM-based languages microservice architecture API design debug production issues CI/CD practices AI tools CI/CD

Benefits

Discount stock purchasing plans (ESPP)
Health and personal accident insurance
Daily lunch and snacks at the office
Commuting allowance
Discounted phone operator services and compensation for a new phone

See full job description

AI Product Engineer

ControlUp · Posted Nov 9, 2026

Open

Poland
Hybrid
Full-time
5+ years

Apply with RefersoAI Apply on careers page

Build AI-powered product features from concept to production, owning full-stack development and customer-facing delivery.

Responsibilities

Own end-to-end feature development from customer problem to backend, data, UI, release and measurement
Build data pipelines integrating vulnerability, patch and device data
Design and ship AI features for risk explanation, prioritization and remediation
Ensure production quality with monitoring, alerting and reliability
Collaborate directly with customers and field teams to iterate on solutions

Requirements

Nice to have: security or compliance domain
Nice to have: endpoint or IT operations
Nice to have: founding engineer or early-startup experience
Nice to have: side projects or open source

See full job description

Software Engineer, AI Developer Platform

Mirage · Posted Nov 9, 2026

Open

Union Square, New York, United States
On-site
Full-time · Senior
5+ years

Apply with RefersoAI Apply on careers page

Backend engineer responsible for building and maintaining AI-driven development infrastructure, CI/CD, security, and developer platform tools at Mirage.

Responsibilities

Ship features alongside product engineers across video creation software, rendering engine, and developer platform
Turn insights into tools, agents, and streamlined workflows
Rebuild CI/CD to support high change volume
Make deployments safe with progressive rollouts and automated rollback
Own environments for coding agents, including sandboxes and tooling

Requirements

Nice to have: offensive security
Nice to have: penetration testing
Nice to have: red-teaming
Nice to have: bug bounties
Nice to have: CTFs

Skills

Benefits

Comprehensive medical, dental, and vision plans
401K with employer match
Commuter Benefits
Catered lunch multiple days per week
Dinner stipend

See full job description

Forward Deployed Engineer (FDE)

Appsforce · Posted Nov 9, 2026

Open

Tel Aviv, Tel Aviv, Israel
On-site
Mid

Apply with RefersoAI Apply on careers page

A hands-on engineering role focused on AI adoption within a financial institution, involving development of AI-powered applications, integrations, and end-to-end solution deployment.

Requirements

Software Engineering
Backend Development
Full Stack Development
LLMs
APIs

Skills

Software Engineering Backend Development Full Stack Development LLMs APIs System integrations Data processing Software architecture Communication Interpersonal skills

See full job description

Senior Software Engineer - Billing Automation - 12 Month FTC

Wireless Logic · Posted Nov 2, 2026

Open

Poland
Hybrid
Contract · Senior
5+ years

Apply with RefersoAI Apply on careers page

Responsibilities

Design, build and maintain TypeScript/NestJS domain services
Build React applications
Shape billing rules and models
Build and evolve event‑driven workflows with Kafka or RabbitMQ
Design and optimise PostgreSQL schemas and queries

Requirements

Bachelor's degree in Computer Science or related field
Nice to have: AWS (ECS, S3, Parameter Store, SES)
Nice to have: Terraform
Nice to have: Observability (metrics, tracing, logs, Grafana)
Nice to have: Domain‑driven design

Skills

TypeScript NestJS React Kafka RabbitMQ PostgreSQL Event‑driven architecture Backend development Full‑stack development Testing CI/CD GitLab Grafana Terraform AWS

Benefits

Full training and ongoing support
Remote/hybrid flexibility
Office culture
Employee growth opportunities

See full job description

Senior Software Engineer - BE

Toast · Posted Dec 9, 2025

Open

Chennai, Tamil Nadu, India
Hybrid
Full-time · Senior
6+ years

Apply with RefersoAI Apply on careers page

As a Senior Backend Software Engineer at Toast, you’ll play a critical role in shaping the backend systems that power our platform, focusing on scalable, reliable, and secure backend services.

Responsibilities

Build new products and Evolve Toast’s existing products suite to meet global market needs
Lead projects from discovery and development to roll out
Design, develop, and maintain robust, scalable, and secure backend services and APIs
Collaborate closely with cross-functional teams, including product managers, frontend engineers, and data teams, to deliver impactful solutions
Lead efforts to enhance the performance and reliability of our systems, ensuring high availability and low latency

Requirements

Any UG
Nice to have: open-source contributions
Nice to have: mentoring

Skills

backend development Java Kotlin RESTful APIs microservices architecture database design SQL NoSQL AWS Docker Kubernetes event-driven architectures Kafka RabbitMQ

Benefits

competitive compensation and benefits programs

See full job description

Staff Software Engineer

Raydar · Posted Nov 5, 2026

Open

San Francisco, California, United States
On-site
Full-time · Staff
$250K–$320K per year
3+ years

Apply with RefersoAI Apply on careers page

Own the design and architecture of core backend systems for a real-time product, taking features from first design through to live production.

Compensation

Base salary: USD 250K to 320K

Responsibilities

Design and own core backend systems for low-latency, real-time services
Drive performance and reliability improvements using event-driven designs and parallel processing
Collaborate with a small engineering group and company founders across infrastructure, backend and reliability work
Deploy, operate and scale fault-tolerant distributed systems on container orchestration
Take features from initial design through to live production, often within days

Requirements

Computer Science degree
Nice to have: Python
Nice to have: machine learning models
Nice to have: startup experience
Nice to have: mid-size company experience

Skills

software engineering backend development full-stack software database design performance optimization distributed systems container orchestration AI large language models Python

Benefits

Equity

See full job description

Applied AI Engineer

Raydar · Posted Nov 4, 2026

Open

San Diego, California, United States +2 more
Hybrid
Full-time · Senior
$160K–$250K per year

Apply with RefersoAI Apply on careers page

Locations (3)

San Diego, California, United States
Los Angeles, California, United States
San Francisco Bay Area, California, United States

Compensation

Salary: $160K - $250K

Responsibilities

Build multi-step agent workflows that track state, propose actions and carry tasks through to completion.
Link language models to external functions, stored context and lookup layers that span mixed data sources.
Safeguard sensitive information and design fallback behavior for failed tools, incomplete inputs and unreliable model outputs.
Set up test harnesses that score how well generative features perform and feed results back into iteration.
Tune AI interactions for speed, clarity, and user control.

Requirements

Master's degree in computer science, mathematics, physics or a related quantitative field
Nice to have: FastAPI
Nice to have: manufacturing background
Nice to have: industrial operations software background

Skills

Python language-model agents function calling stateful context self-directed planning systematic scoring and testing retrieval systems backend development FastAPI

Benefits

Bonus
Equity

See full job description

Principal Software Engineer (Cortex Vulnerability Experience Platform)

Palo Alto Networks · Posted Jul 27, 2026

Open

California, United States
Principal
$147K–$238K per year
8+ years
Visa sponsorship

Apply with RefersoAI Apply on careers page

Design, build, and maintain the features for the unified vulnerability and exposure management experience

Compensation

$147,000.00 - $237,500.00/yr

Responsibilities

Design, build, and maintain the features for the unified vulnerability and exposure management experience
Take part in architecture strategy sessions - design solutions that accommodate the requirements of the various groups across Cortex
Collaborate with teams to solve problems, reduce technical debt, and evolve development practices
Drive technical best practices and evangelize new technologies within the engineering org
Collaborate with other engineers and ensure that your team delivers high-quality output

Skills

Python backend development cloud platforms CI/CD test driven development GCP AWS Azure

See full job description

Staff Software Engineer, Backend

AssetMark · Posted Jun 12, 2026

Open

Austin, Texas, United States
On-site
Full-time · Staff
$180K–$220K per year
8–12 years

Apply with RefersoAI Apply on careers page

Voyant is seeking a hands‑on Staff Engineer, Backend Engineering to play a key role in building and evolving our core server platform.

Compensation

Compensation: The Base Salary range for this position is between $180,000-$220,000. This position will also be eligible for additional variable incentive compensation and competitive benefits.

Responsibilities

Hands‑On Development – Design, build, and maintain backend systems, APIs, and services.
Technical Leadership – Serve as the go‑to technical leader for the team, guiding design decisions and setting engineering standards.
Mentorship – Mentor and support junior developers, providing guidance, feedback, and technical coaching.
Architecture & Design – Contribute to and help shape scalable, secure, and maintainable system architecture.
Code Quality – Lead code reviews and promote best practices across the codebase.

Requirements

Bachelor's in Computer Science
Master's in Computer Science

Skills

Spring Hibernate SSO SAML OpenID MySQL Agile Backend Development Software Architecture Design Patterns

Benefits

Flex Time or Paid Time Off and Sick Time Off
401K – 6% Employer Match
Medical, Dental, Vision – HDHP or PPO
HSA – Employer contribution (HDHP only)
Volunteer Time Off

See full job description