Freelance Senior Software Engineer Job at Seamless.AI

Freelance Senior Software Engineer

We are seeking an experienced Freelance Sr. Software Engineer; Contratista Indep...

Location

Colombia

Salary:

Not provided

Seamless.AI

Expiration Date

Until further notice

Requirements

6+ years of experience in software development
5+ years of experience with modern frontend (React.js) and backend (Node.js, Express.js) JavaScript development
Bachelor’s in computer science or related field or equivalent work experience
Fluency in both English and Spanish
Expert knowledge of modern frontend technologies such as React, ES6/7 JavaScript, Webpack, HTML, and CSS
Expert knowledge of modern back-end development and back-end JavaScript (Node.js, ExpressJS), SQL (Aurora Postgres), and AWS
Excellent communication and interpersonal skills
Strong problem-solving and analytical skills
Experience with software development tools such as GitHub and JIRA
Experience with cloud-based development and deployment, such as AWS

Job Responsibility

Provide technical expertise in the design, development, and maintenance of software products
Develop and maintain high-quality software code in alignment with project requirements
Ensure that project deliverables are completed on time, within budget, and meet quality expectations
Define technical, operational, and security requirements for software projects
Collaborate with other teams to establish and maintain best practices for software development
Offer technical guidance and recommendations to support engineering teams
Conduct code reviews to maintain software quality and adherence to best practices
Research and evaluate new technologies to enhance software development processes and efficiencies
Work with stakeholders to resolve technical challenges, troubleshoot issues, and implement solutions
Contribute to the development and maintenance of technical documentation and system guides

Freelance Senior Software Engineer

We are seeking an experienced Freelance Sr. Software Engineer; Independent Contr...

Location

Costa Rica

Salary:

Not provided

Seamless.AI

Expiration Date

Until further notice

Requirements

6+ years of experience in software development
5+ years of experience with modern frontend (React.js) and backend (Node.js, Express.js) JavaScript development
Bachelor’s in computer science or related field or equivalent work experience
Fluency in English and Spanish is required
Expert knowledge of modern frontend technologies such as React, ES6/7 JavaScript, Webpack, HTML, and CSS
Expert knowledge of modern back-end development and back-end JavaScript (Node.js, ExpressJS), SQL (Aurora Postgres), and AWS
Excellent communication and interpersonal skills
Strong problem-solving and analytical skills, with the ability to identify and address technical issues and challenges
Experience with software development tools such as GitHub and JIRA
Experience with cloud-based development and deployment, such as AWS

Job Responsibility

Provide technical expertise in the design, development, and maintenance of software products
Develop and maintain high-quality software code in alignment with project requirements
Ensure that project deliverables are completed on time, within budget, and meet quality expectations
Define technical, operational, and security requirements for software projects
Collaborate with other teams to establish and maintain best practices for software development
Offer technical guidance and recommendations to support engineering teams
Conduct code reviews to maintain software quality and adherence to best practices
Research and evaluate new technologies to enhance software development processes and efficiencies
Work with stakeholders to resolve technical challenges, troubleshoot issues, and implement solutions
Contribute to the development and maintenance of technical documentation and system guides

Freelance Senior Software Engineer

We are seeking an experienced Freelance Sr. Software Engineer; Independent Contr...

Location

Mexico

Salary:

Not provided

Seamless.AI

Expiration Date

Until further notice

Requirements

6+ years of experience in software development
5+ years of experience with modern frontend (React.js) and backend (Node.js, Express.js) JavaScript development
Bachelor’s in computer science or related field or equivalent work experience
Fluency in both English and Spanish is required

Job Responsibility

Provide technical expertise in the design, development, and maintenance of software products
Develop and maintain high-quality software code in alignment with project requirements
Ensure that project deliverables are completed on time, within budget, and meet quality expectations
Define technical, operational, and security requirements for software projects
Collaborate with other teams to establish and maintain best practices for software development
Offer technical guidance and recommendations to support engineering teams
Conduct code reviews to maintain software quality and adherence to best practices
Research and evaluate new technologies to enhance software development processes and efficiencies
Work with stakeholders to resolve technical challenges, troubleshoot issues, and implement solutions
Contribute to the development and maintenance of technical documentation and system guides

Senior C++ Engineer - AI Training

As a Senior C++ Engineer, you will work remotely on an hourly paid basis to revi...

Location

Salary:

20.00 - 60.00 USD / Hour

Braintrust

Expiration Date

Until further notice

Requirements

Bachelor’s degree or higher in Computer Science, Electrical/Computer Engineering, or a closely related technical field
7+ years of professional experience developing production software in C++ for systems, performance-critical, or large-scale applications
Expert-level proficiency in modern C++ (C++11 and later), including templates, move semantics, smart pointers, and the STL
Strong background in systems programming concepts such as concurrency, operating systems, low-level performance optimization, and memory management
Hands-on experience with C++ build systems, compilers, linkers, debuggers, and profiling or analysis tools
Minimum C1 English proficiency (written and spoken), with the ability to write clear technical explanations and follow detailed English-language guidelines
Proven experience conducting detailed C++ code reviews and enforcing coding standards for safety, performance, and maintainability
Comfort working with version control, CI/CD workflows, and automated testing frameworks in modern C++ projects

Job Responsibility

Review AI-generated C++ code, systems designs, and technical explanations
Generate high-quality reference implementations and step-by-step reasoning for complex engineering problems
Assess solutions for accuracy, clarity, safety, and adherence to the prompt
Identify errors in logic, memory handling, concurrency, or performance
Fact-check technical information
Write high-quality explanations and model solutions that demonstrate correct methods
Rate and compare multiple AI responses based on correctness and reasoning quality
Develop AI Training Content: Create detailed prompts in various topics and responses to guide AI learning, ensuring the models reflect a comprehensive understanding of diverse subjects
Optimize AI Performance: Evaluate and rank AI responses to enhance the model's accuracy, fluency, and contextual relevance
Ensure Model Integrity: Test AI models for potential inaccuracies or biases, validating their reliability across use cases

What we offer

Get rewarded with BTRST, Braintrust's cryptotoken, for inviting talent, taking a class—even signing up! Use token rewards to help shape the future of the platform

Parttime

Freelance Senior User Interface Designer

We are inviting a Freelance Senior UI Designer to join our creative team in crea...

Location

China , Shanghai

Salary:

Not provided

Mobile Now Group

Expiration Date

Until further notice

Requirements

English writing and speaking is mandatory
At least 2 years experience working as a UI designer or in a related field
Experience defining visual & user interface guidelines and building comprehensive designs for applications or software
Experience with production design execution and working with implementation, realizing designs
Knowledge of Sketch, Principle, Zeplin, Keynote, After eﬀects, Photoshop, Illustrator, or equivalents
Proactive, accountable, and detail oriented
Demonstrated ability to critical think, concept, and strategize
Multi-disciplinary experience, able-communicator, and organized

Job Responsibility

Understand the needs of the client and/or project before developing UI and visual foundations
Design compelling interfaces that best reflect our clients’ brand image
Conduct brand studies, trendscapes, and design synthesis as part of the foundational design process
Work in a multi-disciplinary setting, with UX designers, project managers, engineers, and quality analysts
Create pictograms, illustrations, and animations as part of user interface designs
Present and lead clients through iterative workshops
Co-lead the collaborative process with front end engineering on the design-to-dev hand-oﬀ
Conduct build reviews to ensure that implementation accurately reflects designs

Senior Post Producer

The Sr. Post Producer is a highly experienced and strategic leader responsible f...

Location

Argentina , Buenos Aires

Salary:

Not provided

Hogarth

Expiration Date

Until further notice

Requirements

5+ years of progressive experience in a Post Production environment as an active producer within advertising, with a proven track record of successfully managing complex, high-profile campaigns
Advanced understanding of production, post-production, and adaptation project workflows, including experience with diverse content types (e.g., broadcast commercials, digital content, social media, long-form)
Expert-level knowledge of all post-production techniques, software, and how each are used to complete projects (e.g., After Effects, Maya, Nuke, Cinema 4D, Flame, DaVinci Resolve, Unreal Engine, etc.)
Deep familiarity with the various roles, functions, capabilities, equipment, and applications within a modern Post Production Department
Exceptional client relationship management skills, with a proven ability to build rapport, manage expectations, and resolve conflicts effectively
Highly results-driven, proactive, and autonomous, capable of managing multiple projects simultaneously with minimal supervision
Strong leadership and mentorship abilities, with experience guiding and developing junior team members
Advanced working knowledge of industry-standard technology including Adobe Creative Suite (Premier, Photoshop, Illustrator, After Effects), and other relevant post-production tools
Demonstrated ability to adapt to new working methods, emerging technologies, and evolving client needs
Extensive experience with booking VO talent, managing music licensing, and utilizing stock asset libraries

Job Responsibility

Strategic Project Leadership: Lead and oversee the end-to-end post-production lifecycle for multiple, often complex and high-value, projects, ensuring alignment with creative vision, strategic objectives, and client expectations
Budget & Schedule Mastery: Develop, manage, and meticulously track detailed project budgets and schedules, proactively identifying and mitigating risks to ensure projects are delivered on time and within financial constraints. Provide regular, transparent financial updates to stakeholders
Client & Agency Relationship Management: Serve as a primary point of contact for key clients and agency partners, building and maintaining strong, trust-based relationships. Effectively communicate project status, manage expectations, and expertly navigate feedback and revisions
Team Supervision & Mentorship: Provide guidance, mentorship, and oversight to post-production teams and junior producers, fostering a collaborative and high-performing environment. Assign lead operators and allocate resources effectively based on project needs and team strengths
Workflow Optimization & Best Practices: Champion and enforce best practices for post-production workflows, identifying opportunities for process improvements and efficiencies. Define, communicate, and ensure adherence to production standards across all projects
Resource Management & Vendor Negotiation: Strategically identify, onboard, and manage internal and external resources, including freelance talent and third-party vendors. Expertly negotiate rates and contracts to secure optimal services within budget
Technical & Creative Oversight: Possess a comprehensive understanding of all post-production techniques, software, and emerging technologies (e.g., After Effects, Maya, Nuke, Cinema 4D, Flame, Unreal Engine, etc.) to effectively guide creative decisions and troubleshoot technical challenges
Problem Solving & Risk Mitigation: Proactively identify potential issues, anticipate challenges, and develop innovative solutions to keep projects on track. Demonstrate strong decision-making capabilities under pressure
Quality Assurance: Ensure all deliverables meet Hogarth's rigorous quality standards and client specifications, conducting thorough reviews and approvals at key stages
Financial Reconciliation: Oversee the accurate reconciliation of all project costs, approve invoices, and provide detailed financial reporting to clients and internal stakeholders

What we offer

Inclusion and Impact
Fostering a culture of respect in which everyone feels they belong and has the same opportunities to progress in their careers

Fulltime

New

Developer Support Solutions Engineer

As one of Meta's Developer Support Solutions Engineers, you will be part of a te...

Location

United States , Bellevue

Salary:

98000.00 - 142000.00 USD / Year

New

Refractories Consultant

Join Lucideon as a Refractories Consultant! The Refractories Consultant will pro...

Location

United Kingdom , Stone, Staffordshire

Salary:

Not provided

360 Resourcing Solutions

Expiration Date

Until further notice

Requirements

Bachelor’s degree (minimum) in Materials Science/Engineering or a related discipline
Strong technical understanding of refractories, their applications and associated processes
Practical, hands‑on experience within the refractory sector
Excellent written and verbal communication skills
Demonstrable ability to plan, lead and deliver large technical projects
Highly motivated, collaborative and capable of managing high‑pressure technical decisions
Ideally eligible for UK security clearance

Job Responsibility

Shape the strategic direction of Lucideon’s refractory and harsh‑environment materials capability, acting as an international thought leader through conferences, publications, and client engagement
Ensure the National Refractory Testing Centre aligns with UK industry needs and decarbonisation goals
Support the development and operational delivery of the UKRI‑funded Refractory Testing Centre
Contribute to the management and use of ultra‑high‑temperature and controlled‑atmosphere facilities at the AMRICC Centre
Lead and deliver complex client projects ranging from short‑term studies to large multi‑month programmes
Provide technical consultancy, materials optioneering, literature reviews, and hands‑on development work
Advise on equipment, processes, best practices and contribute to technical documentation
Work with commercial colleagues to scope, design and cost programmes of work
Deliver technical presentations and occasional training to clients and peers
Mentor and support scientists to build strong technical capability within the team

What we offer

Private Medical Insurance
Medical Cash Plan
Annual leave of 25 days plus bank holidays (including Christmas shutdown)
Pension scheme (matched up to 5%)
Life Assurance up to four times basic salary

Fulltime

Freelance Senior Software Engineer

Seamless.AI

Location:
Uruguay

Category:
IT - Software Development

Contract Type:
B2B

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
April 02, 2025

Looking for more opportunities? Search for other job offers that match your skills and interests.

Similar Jobs for Freelance Senior Software Engineer

Freelance Senior Software Engineer

Freelance Senior Software Engineer

Freelance Senior Software Engineer

Senior C++ Engineer - AI Training

Freelance Senior User Interface Designer

Senior Post Producer

Developer Support Solutions Engineer

Refractories Consultant

Freelance Senior Software Engineer

Seamless.AI

Location:Uruguay

Category:IT - Software Development

Contract Type:B2B

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:April 02, 2025

Looking for more opportunities? Search for other job offers that match your skills and interests.

Similar Jobs for Freelance Senior Software Engineer

Freelance Senior Software Engineer

Freelance Senior Software Engineer

Freelance Senior Software Engineer

Senior C++ Engineer - AI Training

Freelance Senior User Interface Designer

Senior Post Producer

Developer Support Solutions Engineer

Refractories Consultant

Location:
Uruguay

Category:
IT - Software Development

Contract Type:
B2B

Job Posted:
April 02, 2025