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Junior Python Flask Developer Jobs in Chelmsford, MA

Flipkey

Jr. PHP Developer

Boston, MA · On-site

FlipKey is hiring a Web Developer to support our growing engineering team and site. FlipKey is the ... A strong eye for design and/or graphic design capability, CakePHP experience, Python experience.

Flipkey

Jr. PHP Developer

Boston, MA

FlipKey is hiring a Web Developer to support our growing engineering team and site. FlipKey is the ... A strong eye for design and/or graphic design capability, CakePHP experience, Python experience.

Bayer

Associate Dir, Full Stack Data Scientist

Cambridge, MA · On-site +1

$64K - $65K/yr

Strong experience with backend frameworks: like Node.js, Python (Flask, FastAPI, Django), or Java ... Background in scientific computing, data engineering, or experimental software development;

BAE Systems

Eng Sr - SW

Nashua, NH · On-site

$97K - $164K/yr

... Python coding standards (PEP 8), and mentor mid-level and junior engineers to ensure a high bar for ... Proficiency with modern Python frameworks (e.g., FastAPI, Flask, or Django). * Database Interaction:

SS&C

Senior Software Engineer

Waltham, MA · On-site

$132K - $174K/yr

Conduct code reviews, mentor junior engineers, and elevate engineering standards * Implement robust ... TypeScript, JavaScript (Node.js), Python, Java Frameworks: React, Spring Boot, Express, Flask APIs ...

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Junior Python Flask Developer information

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How much do junior python flask developer jobs pay per hour?

As of Aug 19, 2026, the average hourly pay for junior python flask developer in Chelmsford, MA is $60.91, according to ZipRecruiter salary data. Most workers in this role earn between $50.19 and $69.18 per hour, depending on experience, location, and employer.

What does a junior Python Flask developer do?

A Junior Python Flask Developer assists in building web applications using the Flask framework and Python programming language. Their responsibilities typically include writing and maintaining code, debugging applications, working with databases, and collaborating with senior developers and designers. They are often involved in both the backend and parts of the frontend, helping to implement new features and ensure the application runs smoothly. This role is ideal for those who are early in their software development career and looking to gain hands-on experience in web development.

What are the key skills and qualifications needed to thrive as a junior Python Flask developer, and why are they important?

To thrive as a Junior Python Flask Developer, you need a solid understanding of Python programming, web development concepts, and familiarity with the Flask framework, typically supported by a relevant degree or coursework. Experience with tools such as Git for version control, RESTful APIs, and basic front-end technologies (HTML, CSS, JavaScript) is also important. Strong problem-solving skills, eagerness to learn, and effective communication help you collaborate with team members and adapt to new challenges. These skills and qualities are crucial for building robust web applications, contributing effectively to projects, and growing in a fast-paced tech environment.

What are some common challenges faced by junior Python Flask developers when working on team-based projects?

As a Junior Python Flask Developer, one common challenge is adapting to established codebases and adhering to team coding standards. Collaborating with senior developers often means integrating your work with theirs, requiring clear communication and frequent code reviews. Additionally, balancing the need to learn new frameworks or tools while delivering features on tight deadlines can be demanding. However, support from experienced team members and regular feedback sessions help foster growth and ensure successful project contributions.

What is the difference between Junior Python Flask Developer vs Junior Django Developer?

AspectJunior Python Flask DeveloperJunior Django Developer
Required CredentialsPython knowledge, basic web development skills, possibly some certificationsPython knowledge, Django framework familiarity, certifications optional
Work EnvironmentStartups, small teams, flexible projectsWeb development companies, larger teams, structured projects
Industry UsageWeb apps, microservices, APIsFull-stack web applications, content management systems
Common Search IntentCompare entry-level Python web frameworksEntry-level Django web development roles

Both roles are entry-level Python web development positions, often requiring similar foundational skills. The main difference lies in the frameworks used: Flask is lightweight and flexible, suitable for microservices and APIs, while Django is more comprehensive, ideal for full-stack web applications. Your choice depends on the project type and your preferred development environment.

What are popular job titles related to Junior Python Flask Developer jobs in Chelmsford, MA?

For Junior Python Flask Developer jobs in Chelmsford, MA, the most frequently searched job titles are:

What job categories do people searching Junior Python Flask Developer jobs in Chelmsford, MA look for?

The top searched job categories for Junior Python Flask Developer jobs in Chelmsford, MA are:

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Cities near Chelmsford, MA with the most Junior Python Flask Developer job openings:

Junior Python Flask Developer jobs near you

Principal Quant Developer

Fidelity Investments

Boston, MA • On-site

Full-time

Medical, Retirement, PTO

Re-posted 16 days ago

Fidelity Investments rating

8.7

Company rating: 8.7 out of 10

Based on 272 frontline employees who took The Breakroom Quiz

16th of 150 rated financial services

Job description


Note: Fidelity will not provide immigration sponsorship for this position.
The Role
The Quantitative Research & Investing Technology (QRIT) team within Fidelity's Asset Management Technology group is seeking a highly motivated and curious Principal Quantitative Developer. In this role you will contribute to a dynamic and fast-paced development team supporting researchers in prototyping and delivering new systematic investment strategies. You will provide high impact solutions on various projects including alpha research, portfolio construction, and risk management. Your technology knowledge covers a broad spectrum of technologies, including Python and PL/SQL databases, positioning you as a full-stack software engineer who capitalizes on enterprise technology. You are committed to constructing high-quality, scalable, robust, resilient and efficient analytical and software solutions that propel investment processes forward.
You will possess:
  • A Bachelor's degree in Computer Science, Financial Engineering, Information Technology, Information Systems, Mathematics, Physics, Statistics, Engineering, or a closely related field and six (6) years of experience as a Senior Quant Developer or similar role.
  • Alternatively, a Master's degree (or equivalent foreign education) in the same fields, accompanied by four (4) years of experience as a Lead Quantitative Development or similar role.
  • This experience should include building high-quality, robust, and efficient systems and solutions for financial investment decisions, utilizing Python, PL/SQL databases, and quantitative techniques.

The Expertise and Skills You Bring
Core Engineering
  • Expert in Python with experience across the development stack (full stack)
  • Exposure to object-oriented programming (OOP) and design patterns
  • Experience in at least one unit testing framework and understanding of test-driven development (TDD) concepts and methodologies
  • Working knowledge of R is a plus

Quantitative & Domain Knowledge
  • Strong, demonstrable knowledge of mathematics, statistics, and quantitative finance (core to this role)
  • Deep understanding of quantitative techniques and methods, statistics and econometrics including probability, linear regression and time series data analysis
  • Analyze and design systems to implement quantitative models for systematic financial investments using Python, including time series forecasting models, multi-asset class portfolio construction strategies, risk management tools, alpha research, and simulation-based algorithms
  • Domain knowledge in either equities, fixed income or alternative asset classes
  • Proven track record of delivering production quant solutions in a systematic investing or trading environment
  • Experience with industry-scale optimization libraries (e.g., Gurobi, CPLEX, Axioma, SciPy) and portfolio construction / optimization is a strong plus
  • Progress towards CFA (or equivalent) a plus

Data & Infrastructure
  • Skilled in SQL databases (Oracle); Snowflake, NoSQL, or Graph databases a plus
  • Skilled in batch and API technologies: such as batch scheduling (using Autosys and Airflow) and creating REST APIs (using FAST API and Flask)
  • Proven ability to construct and manage robust data pipelines and event-driven workflows
  • Proven expertise in system design and cloud architecture on AWS, leveraging resources including Lambda, S3, EKS, and EC2

DevOps & CI/CD
  • Experience in containerization with Docker; orchestration with Kubernetes a plus
  • Implement CI/CD pipelines (using Linux and Jenkins), code versioning using GitHub
  • Experience in Infrastructure as Code methodologies for consistent and scalable infrastructure management
  • Familiarity with observability and production support (logging, tracing, monitoring, alerting) a plus

MLOps & AI (Preferred)
  • Operationalizing ML models and pipelines on AWS using modern MLOps principles, including SageMaker (training, deployment, model registry, monitoring) and Bedrock (foundation model access, fine-tuning) and production lifecycle management
  • Familiarity with experiment tracking and model versioning tools (e.g., MLflow)
  • Applying ML to quantitative investing: time series forecasting, anomaly detection, and predictive analytics
  • Deploying and operationalizing LLM-based / agentic workflows in production (e.g., LangGraph, LangChain), including orchestration, tool use, monitoring, and evaluation
  • Awareness of responsible AI governance practices

Collaboration & Communication
  • Strong communication and problem-solving skills; partners effectively with quant researchers and investment teams to deliver solutions through the full development lifecycle

The Team
The Quant Development team is part of Asset Management's Quantitative Research & Investment Technology group. We partner with Asset Management's Advance Strategies and Research team on cutting edge projects including systematic investment strategies, portfolio construction, risk management, alpha research, and GenAI. We build high quality, robust, and highly-scalable solutions that are used to improve Asset Management's efficiency and decision-making processes.
Fidelity's Onsite Working Model
Fidelity is transitioning to a full-time onsite working model through a phased rollout across regions and roles. Currently, some roles and locations require 100% onsite presence, while others require less. Onsite expectations are likely to evolve as the rollout continues. This transition does not apply to fully remote roles.
The base salary range for this position is $107,000-216,000 USD per year.
Placement in the range will vary based on job responsibilities and scope, geographic location, candidate's relevant experience, and other factors.
Base salary is only part of the total compensation package. Depending on the position and eligibility requirements, the offer package may also include bonus or other variable compensation.
We offer a wide range of benefits to meet your evolving needs and help you live your best life at work and at home. These benefits include comprehensive health care coverage and emotional well-being support, market-leading retirement, generous paid time off and parental leave, charitable giving employee match program, and educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career. Note, the application window closes when the position is filled or unposted.
Please be advised that Fidelity's business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories.
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Category:
Information Technology

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