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Senior Backend Engineer Jobs in Portland, ME (NOW HIRING)

Senior Backend Engineer information

See Portland, ME salary details

$61.9K

$151.1K

$203.6K

How much do senior backend engineer jobs pay per year?

As of Aug 12, 2026, the average yearly pay for senior backend engineer in Portland, ME is $151,075.00, according to ZipRecruiter salary data. Most workers in this role earn between $126,900.00 and $176,000.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a senior backend engineer, and why are they important?

To thrive as a Senior Backend Engineer, you need advanced proficiency in server-side programming languages (such as Java, Python, or Node.js), database management, and experience with scalable system architecture, typically supported by a relevant degree and several years of professional experience. Familiarity with frameworks, APIs, containerization tools (like Docker and Kubernetes), and cloud platforms (such as AWS or Azure) is essential, along with knowledge of version control systems like Git. Strong problem-solving abilities, effective communication, and mentorship skills help you collaborate across teams and guide junior developers. These skills ensure the delivery of robust, efficient, and maintainable backend systems that support business objectives and seamless user experiences.

What are some common challenges senior backend engineers face when scaling backend systems, and how are they typically addressed?

Senior Backend Engineers often encounter challenges related to system scalability, such as database bottlenecks, latency issues, and maintaining system reliability under increased load. Addressing these challenges typically involves optimizing database queries, implementing caching strategies, and designing microservices architectures to distribute workloads efficiently. Collaboration with DevOps and frontend teams is also crucial to ensure seamless integration and monitoring. Proactively identifying potential scalability issues and participating in code reviews are key responsibilities in this role.

What does a senior backend engineer do?

A senior backend engineer designs, develops, and maintains server-side applications and systems that support web and mobile platforms. They often work with programming languages like Java, Python, or Node.js, and use databases, APIs, and cloud services to ensure scalable and efficient backend operations. Additionally, they review code, mentor junior developers, and ensure system security and performance standards are met.

What is a senior backend engineer?

Senior Backend Engineers are experienced software professionals responsible for designing, developing, and maintaining the server-side components of web applications or systems. They work with databases, APIs, and application logic to ensure robust, scalable, and efficient backend operations. Their role often involves collaborating with frontend engineers, managing system architecture, reviewing code, and mentoring junior developers. Senior Backend Engineers also play a key role in optimizing performance, ensuring security, and integrating new technologies into existing systems.
Infographic showing various Senior Backend Engineer job openings in Portland, ME as of August 2026, with employment types broken down into 82% Full Time, 13% Part Time, and 5% Contract. Highlights an 86% Physical, 5% Hybrid, and 9% Remote job distribution, with an average salary of $151,075 per year, or $72.6 per hour.

Machine Learning Engineer II, Logistics AI

Instacart

Biddeford, ME • On-site

Full-time

Re-posted 22 days ago


Instacart rating

7.1

Company rating: 7.1 out of 10

Based on 31 frontline employees who took The Breakroom Quiz

28th of 64 rated delivery companies


Job description

We're transforming the grocery industry

At Instacart, we invite the world to share love through food because we believe everyone should have access to the food they love and more time to enjoy it together. Where others see a simple need for grocery delivery, we see exciting complexity and endless opportunity to serve the varied needs of our community. We work to deliver an essential service that customers rely on to get their groceries and household goods, while also offering safe and flexible earnings opportunities to Instacart Personal Shoppers.

Instacart has become a lifeline for millions of people, and we’re building the team to help push our shopping cart forward. If you’re ready to do the best work of your life, come join our table.

Instacart is a Flex First team

There’s no one-size fits all approach to how we do our best work. Our employees have the flexibility to choose where they do their best work—whether it’s from home, an office, or your favorite coffee shop—while staying connected and building community through regular in-person events. Learn more about our flexible approach to where we work.

About the Role:

As a Machine Learning Engineer, you will have the opportunity to collaborate closely with senior engineers and product leaders as part of your team. Together, you'll develop and enhance Instacart's marketplace systems. You will use machine learning to devise and refine solutions in crucial areas such as routing optimization, pricing, dispatch, and mapping. You will actively contribute to initiatives, assisting in all stages from the initial concept, through prototyping and experimentation, to final implementation.

About the Team:

The Logistics AI group is responsible for the intelligence and execution behind Instacart’s fulfillment system. The team optimizes a multi-sided marketplace to ensure customers get their orders on-time and in high quality, shoppers get efficient and fulfilling work, and retailers and consumer brands get reasonable business. The team tackles hard problems in a variety of spaces, such as matching, pricing, and geospatial, as well as foundational problems executing on a high throughput system with dynamic data.

About the Job:

  • Design, develop, and deploy machine learning solutions to tackle practical challenges in the marketplace.
  • Collaborate closely with product managers, data scientists, and backend engineers to deeply understand business needs and create impactful ML/AI applications.
  • Actively engage with diverse stakeholders to ensure that solutions are well-integrated and aligned with business goals.
  • Push the envelope on our operational efficiency by continually refining and advancing our algorithms and models.

About You:

Minimum Qualifications:

  • Have a graduate degree (masters or PhD) in artificial intelligence, machine learning, operations research or equivalent self study and experience 
  • Have strong programming skills in Python and fluency in data manipulation (SQL, Pandas) and Machine Learning (scikit-learn, XGBoost, Keras/Tensorflow) tools
  • Have strong analytical skills and problem-solving ability
  • Are a strong communicator who can collaborate with diverse stakeholders across all levels

Preferred Qualifications:

  • Have 1-2 years of industry experience using machine learning to solve real-world problems with large datasets
  • Knowledge of deep learning frameworks and methodologies
  • Experience in applying machine learning and optimization techniques to solve marketplace problems

Instacart provides highly market-competitive compensation and benefits in each location where our employees work. This role is remote and the base pay range for a successful candidate is dependent on their permanent work location. Please review our Flex First remote work policy here.

Offers may vary based on many factors, such as candidate experience and skills required for the role. Additionally, this role is eligible for a new hire equity grant as well as annual refresh grants. Please read more about our benefits offerings here.

For US based candidates, the base pay ranges for a successful candidate are listed below.


What Instacart employees say

Pay

Benefits

Hours and flexibility

Workplace

Get the full story on Breakroom


Instacart logo

About Instacart

Sourced by ZipRecruiter

Instacart, based in San Francisco, CA, US, operates within the retail industry, specifically grocery delivery and pick-up service. It is recognized as a pioneer in this field, delivering fresh groceries from local stores directly to customers' doors. The company, which launched its services in 2012, continues to pioneer change in the online grocery shopping sector through its commitment to cutting-edge technology, new business ideas, and dedicated service.

Industry

Technology, communication and media

Company size

10,000+ Employees

Headquarters location

San Francisco, CA, US

Year founded

2012